diff --git a/netty/server/.gitignore b/netty/.gitignore
similarity index 100%
rename from netty/server/.gitignore
rename to netty/.gitignore
diff --git a/netty/client/.gitignore b/netty/client/.gitignore
deleted file mode 100644
index 485dee6..0000000
--- a/netty/client/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-.idea
diff --git a/netty/client/index.html b/netty/client/index.html
index e080a80..4c0af36 100644
--- a/netty/client/index.html
+++ b/netty/client/index.html
@@ -4,7 +4,7 @@
   <meta charset="UTF-8">
   <title>Title</title>
   <script src="flatbuffers.js"></script>
-  <script src="sample_generated.js"></script>
+  <script src="schema_generated.js"></script>
   <script src="script.js"></script>
 </head>
 <body>
diff --git a/netty/client/sample_generated.js b/netty/client/sample_generated.js
deleted file mode 100644
index 3ac7c81..0000000
--- a/netty/client/sample_generated.js
+++ /dev/null
@@ -1,575 +0,0 @@
-// automatically generated by the FlatBuffers compiler, do not modify
-
-/**
- * @const
- * @namespace
- */
-var MyGame = MyGame || {};
-
-/**
- * @const
- * @namespace
- */
-MyGame.Sample = MyGame.Sample || {};
-
-/**
- * @enum {number}
- */
-MyGame.Sample.Color = {
-  Red: 0,
-  Green: 1,
-  Blue: 2
-};
-
-/**
- * @enum {string}
- */
-MyGame.Sample.ColorName = {
-  '0': 'Red',
-  '1': 'Green',
-  '2': 'Blue'
-};
-
-/**
- * @enum {number}
- */
-MyGame.Sample.Equipment = {
-  NONE: 0,
-  Weapon: 1
-};
-
-/**
- * @enum {string}
- */
-MyGame.Sample.EquipmentName = {
-  '0': 'NONE',
-  '1': 'Weapon'
-};
-
-/**
- * @constructor
- */
-MyGame.Sample.Vec3 = function() {
-  /**
-   * @type {flatbuffers.ByteBuffer}
-   */
-  this.bb = null;
-
-  /**
-   * @type {number}
-   */
-  this.bb_pos = 0;
-};
-
-/**
- * @param {number} i
- * @param {flatbuffers.ByteBuffer} bb
- * @returns {MyGame.Sample.Vec3}
- */
-MyGame.Sample.Vec3.prototype.__init = function(i, bb) {
-  this.bb_pos = i;
-  this.bb = bb;
-  return this;
-};
-
-/**
- * @returns {number}
- */
-MyGame.Sample.Vec3.prototype.x = function() {
-  return this.bb.readFloat32(this.bb_pos);
-};
-
-/**
- * @returns {number}
- */
-MyGame.Sample.Vec3.prototype.y = function() {
-  return this.bb.readFloat32(this.bb_pos + 4);
-};
-
-/**
- * @returns {number}
- */
-MyGame.Sample.Vec3.prototype.z = function() {
-  return this.bb.readFloat32(this.bb_pos + 8);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {number} x
- * @param {number} y
- * @param {number} z
- * @returns {flatbuffers.Offset}
- */
-MyGame.Sample.Vec3.createVec3 = function(builder, x, y, z) {
-  builder.prep(4, 12);
-  builder.writeFloat32(z);
-  builder.writeFloat32(y);
-  builder.writeFloat32(x);
-  return builder.offset();
-};
-
-/**
- * @constructor
- */
-MyGame.Sample.Monster = function() {
-  /**
-   * @type {flatbuffers.ByteBuffer}
-   */
-  this.bb = null;
-
-  /**
-   * @type {number}
-   */
-  this.bb_pos = 0;
-};
-
-/**
- * @param {number} i
- * @param {flatbuffers.ByteBuffer} bb
- * @returns {MyGame.Sample.Monster}
- */
-MyGame.Sample.Monster.prototype.__init = function(i, bb) {
-  this.bb_pos = i;
-  this.bb = bb;
-  return this;
-};
-
-/**
- * @param {flatbuffers.ByteBuffer} bb
- * @param {MyGame.Sample.Monster=} obj
- * @returns {MyGame.Sample.Monster}
- */
-MyGame.Sample.Monster.getRootAsMonster = function(bb, obj) {
-  return (obj || new MyGame.Sample.Monster).__init(bb.readInt32(bb.position()) + bb.position(), bb);
-};
-
-/**
- * @param {flatbuffers.ByteBuffer} bb
- * @param {MyGame.Sample.Monster=} obj
- * @returns {MyGame.Sample.Monster}
- */
-MyGame.Sample.Monster.getSizePrefixedRootAsMonster = function(bb, obj) {
-  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
-  return (obj || new MyGame.Sample.Monster).__init(bb.readInt32(bb.position()) + bb.position(), bb);
-};
-
-/**
- * @param {MyGame.Sample.Vec3=} obj
- * @returns {MyGame.Sample.Vec3|null}
- */
-MyGame.Sample.Monster.prototype.pos = function(obj) {
-  var offset = this.bb.__offset(this.bb_pos, 4);
-  return offset ? (obj || new MyGame.Sample.Vec3).__init(this.bb_pos + offset, this.bb) : null;
-};
-
-/**
- * @returns {number}
- */
-MyGame.Sample.Monster.prototype.mana = function() {
-  var offset = this.bb.__offset(this.bb_pos, 6);
-  return offset ? this.bb.readInt16(this.bb_pos + offset) : 150;
-};
-
-/**
- * @returns {number}
- */
-MyGame.Sample.Monster.prototype.hp = function() {
-  var offset = this.bb.__offset(this.bb_pos, 8);
-  return offset ? this.bb.readInt16(this.bb_pos + offset) : 100;
-};
-
-/**
- * @param {flatbuffers.Encoding=} optionalEncoding
- * @returns {string|Uint8Array|null}
- */
-MyGame.Sample.Monster.prototype.name = function(optionalEncoding) {
-  var offset = this.bb.__offset(this.bb_pos, 10);
-  return offset ? this.bb.__string(this.bb_pos + offset, optionalEncoding) : null;
-};
-
-/**
- * @param {number} index
- * @returns {number}
- */
-MyGame.Sample.Monster.prototype.inventory = function(index) {
-  var offset = this.bb.__offset(this.bb_pos, 14);
-  return offset ? this.bb.readUint8(this.bb.__vector(this.bb_pos + offset) + index) : 0;
-};
-
-/**
- * @returns {number}
- */
-MyGame.Sample.Monster.prototype.inventoryLength = function() {
-  var offset = this.bb.__offset(this.bb_pos, 14);
-  return offset ? this.bb.__vector_len(this.bb_pos + offset) : 0;
-};
-
-/**
- * @returns {Uint8Array}
- */
-MyGame.Sample.Monster.prototype.inventoryArray = function() {
-  var offset = this.bb.__offset(this.bb_pos, 14);
-  return offset ? new Uint8Array(this.bb.bytes().buffer, this.bb.bytes().byteOffset + this.bb.__vector(this.bb_pos + offset), this.bb.__vector_len(this.bb_pos + offset)) : null;
-};
-
-/**
- * @returns {MyGame.Sample.Color}
- */
-MyGame.Sample.Monster.prototype.color = function() {
-  var offset = this.bb.__offset(this.bb_pos, 16);
-  return offset ? /** @type {MyGame.Sample.Color} */ (this.bb.readInt8(this.bb_pos + offset)) : MyGame.Sample.Color.Blue;
-};
-
-/**
- * @param {number} index
- * @param {MyGame.Sample.Weapon=} obj
- * @returns {MyGame.Sample.Weapon}
- */
-MyGame.Sample.Monster.prototype.weapons = function(index, obj) {
-  var offset = this.bb.__offset(this.bb_pos, 18);
-  return offset ? (obj || new MyGame.Sample.Weapon).__init(this.bb.__indirect(this.bb.__vector(this.bb_pos + offset) + index * 4), this.bb) : null;
-};
-
-/**
- * @returns {number}
- */
-MyGame.Sample.Monster.prototype.weaponsLength = function() {
-  var offset = this.bb.__offset(this.bb_pos, 18);
-  return offset ? this.bb.__vector_len(this.bb_pos + offset) : 0;
-};
-
-/**
- * @returns {MyGame.Sample.Equipment}
- */
-MyGame.Sample.Monster.prototype.equippedType = function() {
-  var offset = this.bb.__offset(this.bb_pos, 20);
-  return offset ? /** @type {MyGame.Sample.Equipment} */ (this.bb.readUint8(this.bb_pos + offset)) : MyGame.Sample.Equipment.NONE;
-};
-
-/**
- * @param {flatbuffers.Table} obj
- * @returns {?flatbuffers.Table}
- */
-MyGame.Sample.Monster.prototype.equipped = function(obj) {
-  var offset = this.bb.__offset(this.bb_pos, 22);
-  return offset ? this.bb.__union(obj, this.bb_pos + offset) : null;
-};
-
-/**
- * @param {number} index
- * @param {MyGame.Sample.Vec3=} obj
- * @returns {MyGame.Sample.Vec3}
- */
-MyGame.Sample.Monster.prototype.path = function(index, obj) {
-  var offset = this.bb.__offset(this.bb_pos, 24);
-  return offset ? (obj || new MyGame.Sample.Vec3).__init(this.bb.__vector(this.bb_pos + offset) + index * 12, this.bb) : null;
-};
-
-/**
- * @returns {number}
- */
-MyGame.Sample.Monster.prototype.pathLength = function() {
-  var offset = this.bb.__offset(this.bb_pos, 24);
-  return offset ? this.bb.__vector_len(this.bb_pos + offset) : 0;
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- */
-MyGame.Sample.Monster.startMonster = function(builder) {
-  builder.startObject(11);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {flatbuffers.Offset} posOffset
- */
-MyGame.Sample.Monster.addPos = function(builder, posOffset) {
-  builder.addFieldStruct(0, posOffset, 0);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {number} mana
- */
-MyGame.Sample.Monster.addMana = function(builder, mana) {
-  builder.addFieldInt16(1, mana, 150);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {number} hp
- */
-MyGame.Sample.Monster.addHp = function(builder, hp) {
-  builder.addFieldInt16(2, hp, 100);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {flatbuffers.Offset} nameOffset
- */
-MyGame.Sample.Monster.addName = function(builder, nameOffset) {
-  builder.addFieldOffset(3, nameOffset, 0);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {flatbuffers.Offset} inventoryOffset
- */
-MyGame.Sample.Monster.addInventory = function(builder, inventoryOffset) {
-  builder.addFieldOffset(5, inventoryOffset, 0);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {Array.<number>} data
- * @returns {flatbuffers.Offset}
- */
-MyGame.Sample.Monster.createInventoryVector = function(builder, data) {
-  builder.startVector(1, data.length, 1);
-  for (var i = data.length - 1; i >= 0; i--) {
-    builder.addInt8(data[i]);
-  }
-  return builder.endVector();
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {number} numElems
- */
-MyGame.Sample.Monster.startInventoryVector = function(builder, numElems) {
-  builder.startVector(1, numElems, 1);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {MyGame.Sample.Color} color
- */
-MyGame.Sample.Monster.addColor = function(builder, color) {
-  builder.addFieldInt8(6, color, MyGame.Sample.Color.Blue);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {flatbuffers.Offset} weaponsOffset
- */
-MyGame.Sample.Monster.addWeapons = function(builder, weaponsOffset) {
-  builder.addFieldOffset(7, weaponsOffset, 0);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {Array.<flatbuffers.Offset>} data
- * @returns {flatbuffers.Offset}
- */
-MyGame.Sample.Monster.createWeaponsVector = function(builder, data) {
-  builder.startVector(4, data.length, 4);
-  for (var i = data.length - 1; i >= 0; i--) {
-    builder.addOffset(data[i]);
-  }
-  return builder.endVector();
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {number} numElems
- */
-MyGame.Sample.Monster.startWeaponsVector = function(builder, numElems) {
-  builder.startVector(4, numElems, 4);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {MyGame.Sample.Equipment} equippedType
- */
-MyGame.Sample.Monster.addEquippedType = function(builder, equippedType) {
-  builder.addFieldInt8(8, equippedType, MyGame.Sample.Equipment.NONE);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {flatbuffers.Offset} equippedOffset
- */
-MyGame.Sample.Monster.addEquipped = function(builder, equippedOffset) {
-  builder.addFieldOffset(9, equippedOffset, 0);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {flatbuffers.Offset} pathOffset
- */
-MyGame.Sample.Monster.addPath = function(builder, pathOffset) {
-  builder.addFieldOffset(10, pathOffset, 0);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {number} numElems
- */
-MyGame.Sample.Monster.startPathVector = function(builder, numElems) {
-  builder.startVector(12, numElems, 4);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @returns {flatbuffers.Offset}
- */
-MyGame.Sample.Monster.endMonster = function(builder) {
-  var offset = builder.endObject();
-  return offset;
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {flatbuffers.Offset} offset
- */
-MyGame.Sample.Monster.finishMonsterBuffer = function(builder, offset) {
-  builder.finish(offset);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {flatbuffers.Offset} offset
- */
-MyGame.Sample.Monster.finishSizePrefixedMonsterBuffer = function(builder, offset) {
-  builder.finish(offset, undefined, true);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {flatbuffers.Offset} posOffset
- * @param {number} mana
- * @param {number} hp
- * @param {flatbuffers.Offset} nameOffset
- * @param {flatbuffers.Offset} inventoryOffset
- * @param {MyGame.Sample.Color} color
- * @param {flatbuffers.Offset} weaponsOffset
- * @param {MyGame.Sample.Equipment} equippedType
- * @param {flatbuffers.Offset} equippedOffset
- * @param {flatbuffers.Offset} pathOffset
- * @returns {flatbuffers.Offset}
- */
-MyGame.Sample.Monster.createMonster = function(builder, posOffset, mana, hp, nameOffset, inventoryOffset, color, weaponsOffset, equippedType, equippedOffset, pathOffset) {
-  MyGame.Sample.Monster.startMonster(builder);
-  MyGame.Sample.Monster.addPos(builder, posOffset);
-  MyGame.Sample.Monster.addMana(builder, mana);
-  MyGame.Sample.Monster.addHp(builder, hp);
-  MyGame.Sample.Monster.addName(builder, nameOffset);
-  MyGame.Sample.Monster.addInventory(builder, inventoryOffset);
-  MyGame.Sample.Monster.addColor(builder, color);
-  MyGame.Sample.Monster.addWeapons(builder, weaponsOffset);
-  MyGame.Sample.Monster.addEquippedType(builder, equippedType);
-  MyGame.Sample.Monster.addEquipped(builder, equippedOffset);
-  MyGame.Sample.Monster.addPath(builder, pathOffset);
-  return MyGame.Sample.Monster.endMonster(builder);
-}
-
-/**
- * @constructor
- */
-MyGame.Sample.Weapon = function() {
-  /**
-   * @type {flatbuffers.ByteBuffer}
-   */
-  this.bb = null;
-
-  /**
-   * @type {number}
-   */
-  this.bb_pos = 0;
-};
-
-/**
- * @param {number} i
- * @param {flatbuffers.ByteBuffer} bb
- * @returns {MyGame.Sample.Weapon}
- */
-MyGame.Sample.Weapon.prototype.__init = function(i, bb) {
-  this.bb_pos = i;
-  this.bb = bb;
-  return this;
-};
-
-/**
- * @param {flatbuffers.ByteBuffer} bb
- * @param {MyGame.Sample.Weapon=} obj
- * @returns {MyGame.Sample.Weapon}
- */
-MyGame.Sample.Weapon.getRootAsWeapon = function(bb, obj) {
-  return (obj || new MyGame.Sample.Weapon).__init(bb.readInt32(bb.position()) + bb.position(), bb);
-};
-
-/**
- * @param {flatbuffers.ByteBuffer} bb
- * @param {MyGame.Sample.Weapon=} obj
- * @returns {MyGame.Sample.Weapon}
- */
-MyGame.Sample.Weapon.getSizePrefixedRootAsWeapon = function(bb, obj) {
-  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
-  return (obj || new MyGame.Sample.Weapon).__init(bb.readInt32(bb.position()) + bb.position(), bb);
-};
-
-/**
- * @param {flatbuffers.Encoding=} optionalEncoding
- * @returns {string|Uint8Array|null}
- */
-MyGame.Sample.Weapon.prototype.name = function(optionalEncoding) {
-  var offset = this.bb.__offset(this.bb_pos, 4);
-  return offset ? this.bb.__string(this.bb_pos + offset, optionalEncoding) : null;
-};
-
-/**
- * @returns {number}
- */
-MyGame.Sample.Weapon.prototype.damage = function() {
-  var offset = this.bb.__offset(this.bb_pos, 6);
-  return offset ? this.bb.readInt16(this.bb_pos + offset) : 0;
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- */
-MyGame.Sample.Weapon.startWeapon = function(builder) {
-  builder.startObject(2);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {flatbuffers.Offset} nameOffset
- */
-MyGame.Sample.Weapon.addName = function(builder, nameOffset) {
-  builder.addFieldOffset(0, nameOffset, 0);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {number} damage
- */
-MyGame.Sample.Weapon.addDamage = function(builder, damage) {
-  builder.addFieldInt16(1, damage, 0);
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @returns {flatbuffers.Offset}
- */
-MyGame.Sample.Weapon.endWeapon = function(builder) {
-  var offset = builder.endObject();
-  return offset;
-};
-
-/**
- * @param {flatbuffers.Builder} builder
- * @param {flatbuffers.Offset} nameOffset
- * @param {number} damage
- * @returns {flatbuffers.Offset}
- */
-MyGame.Sample.Weapon.createWeapon = function(builder, nameOffset, damage) {
-  MyGame.Sample.Weapon.startWeapon(builder);
-  MyGame.Sample.Weapon.addName(builder, nameOffset);
-  MyGame.Sample.Weapon.addDamage(builder, damage);
-  return MyGame.Sample.Weapon.endWeapon(builder);
-}
-
-// Exports for Node.js and RequireJS
-this.MyGame = MyGame;
diff --git a/netty/client/schema_generated.js b/netty/client/schema_generated.js
new file mode 100644
index 0000000..b9b6a8e
--- /dev/null
+++ b/netty/client/schema_generated.js
@@ -0,0 +1,561 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+/**
+ * @const
+ * @namespace
+ */
+var com = com || {};
+
+/**
+ * @const
+ * @namespace
+ */
+com.miti99 = com.miti99 || {};
+
+/**
+ * @const
+ * @namespace
+ */
+com.miti99.netty = com.miti99.netty || {};
+
+/**
+ * @const
+ * @namespace
+ */
+com.miti99.netty.fbs = com.miti99.netty.fbs || {};
+
+/**
+ * @enum {number}
+ */
+com.miti99.netty.fbs.PacketData = {
+  NONE: 0,
+  LoginRequest: 1,
+  LoginResponse: 2
+};
+
+/**
+ * @enum {string}
+ */
+com.miti99.netty.fbs.PacketDataName = {
+  '0': 'NONE',
+  '1': 'LoginRequest',
+  '2': 'LoginResponse'
+};
+
+/**
+ * @constructor
+ */
+com.miti99.netty.fbs.Vec2 = function() {
+  /**
+   * @type {flatbuffers.ByteBuffer}
+   */
+  this.bb = null;
+
+  /**
+   * @type {number}
+   */
+  this.bb_pos = 0;
+};
+
+/**
+ * @param {number} i
+ * @param {flatbuffers.ByteBuffer} bb
+ * @returns {com.miti99.netty.fbs.Vec2}
+ */
+com.miti99.netty.fbs.Vec2.prototype.__init = function(i, bb) {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+};
+
+/**
+ * @returns {number}
+ */
+com.miti99.netty.fbs.Vec2.prototype.x = function() {
+  return this.bb.readFloat64(this.bb_pos);
+};
+
+/**
+ * @returns {number}
+ */
+com.miti99.netty.fbs.Vec2.prototype.y = function() {
+  return this.bb.readFloat64(this.bb_pos + 8);
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {number} x
+ * @param {number} y
+ * @returns {flatbuffers.Offset}
+ */
+com.miti99.netty.fbs.Vec2.createVec2 = function(builder, x, y) {
+  builder.prep(8, 16);
+  builder.writeFloat64(y);
+  builder.writeFloat64(x);
+  return builder.offset();
+};
+
+/**
+ * @constructor
+ */
+com.miti99.netty.fbs.Player = function() {
+  /**
+   * @type {flatbuffers.ByteBuffer}
+   */
+  this.bb = null;
+
+  /**
+   * @type {number}
+   */
+  this.bb_pos = 0;
+};
+
+/**
+ * @param {number} i
+ * @param {flatbuffers.ByteBuffer} bb
+ * @returns {com.miti99.netty.fbs.Player}
+ */
+com.miti99.netty.fbs.Player.prototype.__init = function(i, bb) {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+};
+
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {com.miti99.netty.fbs.Player=} obj
+ * @returns {com.miti99.netty.fbs.Player}
+ */
+com.miti99.netty.fbs.Player.getRootAsPlayer = function(bb, obj) {
+  return (obj || new com.miti99.netty.fbs.Player).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {com.miti99.netty.fbs.Player=} obj
+ * @returns {com.miti99.netty.fbs.Player}
+ */
+com.miti99.netty.fbs.Player.getSizePrefixedRootAsPlayer = function(bb, obj) {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new com.miti99.netty.fbs.Player).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
+/**
+ * @returns {number}
+ */
+com.miti99.netty.fbs.Player.prototype.userId = function() {
+  var offset = this.bb.__offset(this.bb_pos, 4);
+  return offset ? this.bb.readInt32(this.bb_pos + offset) : 0;
+};
+
+/**
+ * @param {flatbuffers.Encoding=} optionalEncoding
+ * @returns {string|Uint8Array|null}
+ */
+com.miti99.netty.fbs.Player.prototype.userName = function(optionalEncoding) {
+  var offset = this.bb.__offset(this.bb_pos, 6);
+  return offset ? this.bb.__string(this.bb_pos + offset, optionalEncoding) : null;
+};
+
+/**
+ * @param {com.miti99.netty.fbs.Vec2=} obj
+ * @returns {com.miti99.netty.fbs.Vec2|null}
+ */
+com.miti99.netty.fbs.Player.prototype.position = function(obj) {
+  var offset = this.bb.__offset(this.bb_pos, 8);
+  return offset ? (obj || new com.miti99.netty.fbs.Vec2).__init(this.bb_pos + offset, this.bb) : null;
+};
+
+/**
+ * @returns {number}
+ */
+com.miti99.netty.fbs.Player.prototype.rotation = function() {
+  var offset = this.bb.__offset(this.bb_pos, 10);
+  return offset ? this.bb.readFloat64(this.bb_pos + offset) : 0.0;
+};
+
+/**
+ * @returns {number}
+ */
+com.miti99.netty.fbs.Player.prototype.team = function() {
+  var offset = this.bb.__offset(this.bb_pos, 12);
+  return offset ? this.bb.readInt32(this.bb_pos + offset) : 0;
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ */
+com.miti99.netty.fbs.Player.startPlayer = function(builder) {
+  builder.startObject(5);
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {number} userId
+ */
+com.miti99.netty.fbs.Player.addUserId = function(builder, userId) {
+  builder.addFieldInt32(0, userId, 0);
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {flatbuffers.Offset} userNameOffset
+ */
+com.miti99.netty.fbs.Player.addUserName = function(builder, userNameOffset) {
+  builder.addFieldOffset(1, userNameOffset, 0);
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {flatbuffers.Offset} positionOffset
+ */
+com.miti99.netty.fbs.Player.addPosition = function(builder, positionOffset) {
+  builder.addFieldStruct(2, positionOffset, 0);
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {number} rotation
+ */
+com.miti99.netty.fbs.Player.addRotation = function(builder, rotation) {
+  builder.addFieldFloat64(3, rotation, 0.0);
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {number} team
+ */
+com.miti99.netty.fbs.Player.addTeam = function(builder, team) {
+  builder.addFieldInt32(4, team, 0);
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @returns {flatbuffers.Offset}
+ */
+com.miti99.netty.fbs.Player.endPlayer = function(builder) {
+  var offset = builder.endObject();
+  return offset;
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {number} userId
+ * @param {flatbuffers.Offset} userNameOffset
+ * @param {flatbuffers.Offset} positionOffset
+ * @param {number} rotation
+ * @param {number} team
+ * @returns {flatbuffers.Offset}
+ */
+com.miti99.netty.fbs.Player.createPlayer = function(builder, userId, userNameOffset, positionOffset, rotation, team) {
+  com.miti99.netty.fbs.Player.startPlayer(builder);
+  com.miti99.netty.fbs.Player.addUserId(builder, userId);
+  com.miti99.netty.fbs.Player.addUserName(builder, userNameOffset);
+  com.miti99.netty.fbs.Player.addPosition(builder, positionOffset);
+  com.miti99.netty.fbs.Player.addRotation(builder, rotation);
+  com.miti99.netty.fbs.Player.addTeam(builder, team);
+  return com.miti99.netty.fbs.Player.endPlayer(builder);
+}
+
+/**
+ * @constructor
+ */
+com.miti99.netty.fbs.LoginRequest = function() {
+  /**
+   * @type {flatbuffers.ByteBuffer}
+   */
+  this.bb = null;
+
+  /**
+   * @type {number}
+   */
+  this.bb_pos = 0;
+};
+
+/**
+ * @param {number} i
+ * @param {flatbuffers.ByteBuffer} bb
+ * @returns {com.miti99.netty.fbs.LoginRequest}
+ */
+com.miti99.netty.fbs.LoginRequest.prototype.__init = function(i, bb) {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+};
+
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {com.miti99.netty.fbs.LoginRequest=} obj
+ * @returns {com.miti99.netty.fbs.LoginRequest}
+ */
+com.miti99.netty.fbs.LoginRequest.getRootAsLoginRequest = function(bb, obj) {
+  return (obj || new com.miti99.netty.fbs.LoginRequest).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {com.miti99.netty.fbs.LoginRequest=} obj
+ * @returns {com.miti99.netty.fbs.LoginRequest}
+ */
+com.miti99.netty.fbs.LoginRequest.getSizePrefixedRootAsLoginRequest = function(bb, obj) {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new com.miti99.netty.fbs.LoginRequest).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
+/**
+ * @returns {number}
+ */
+com.miti99.netty.fbs.LoginRequest.prototype.userId = function() {
+  var offset = this.bb.__offset(this.bb_pos, 4);
+  return offset ? this.bb.readInt32(this.bb_pos + offset) : 0;
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ */
+com.miti99.netty.fbs.LoginRequest.startLoginRequest = function(builder) {
+  builder.startObject(1);
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {number} userId
+ */
+com.miti99.netty.fbs.LoginRequest.addUserId = function(builder, userId) {
+  builder.addFieldInt32(0, userId, 0);
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @returns {flatbuffers.Offset}
+ */
+com.miti99.netty.fbs.LoginRequest.endLoginRequest = function(builder) {
+  var offset = builder.endObject();
+  return offset;
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {number} userId
+ * @returns {flatbuffers.Offset}
+ */
+com.miti99.netty.fbs.LoginRequest.createLoginRequest = function(builder, userId) {
+  com.miti99.netty.fbs.LoginRequest.startLoginRequest(builder);
+  com.miti99.netty.fbs.LoginRequest.addUserId(builder, userId);
+  return com.miti99.netty.fbs.LoginRequest.endLoginRequest(builder);
+}
+
+/**
+ * @constructor
+ */
+com.miti99.netty.fbs.LoginResponse = function() {
+  /**
+   * @type {flatbuffers.ByteBuffer}
+   */
+  this.bb = null;
+
+  /**
+   * @type {number}
+   */
+  this.bb_pos = 0;
+};
+
+/**
+ * @param {number} i
+ * @param {flatbuffers.ByteBuffer} bb
+ * @returns {com.miti99.netty.fbs.LoginResponse}
+ */
+com.miti99.netty.fbs.LoginResponse.prototype.__init = function(i, bb) {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+};
+
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {com.miti99.netty.fbs.LoginResponse=} obj
+ * @returns {com.miti99.netty.fbs.LoginResponse}
+ */
+com.miti99.netty.fbs.LoginResponse.getRootAsLoginResponse = function(bb, obj) {
+  return (obj || new com.miti99.netty.fbs.LoginResponse).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {com.miti99.netty.fbs.LoginResponse=} obj
+ * @returns {com.miti99.netty.fbs.LoginResponse}
+ */
+com.miti99.netty.fbs.LoginResponse.getSizePrefixedRootAsLoginResponse = function(bb, obj) {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new com.miti99.netty.fbs.LoginResponse).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
+/**
+ * @param {com.miti99.netty.fbs.Player=} obj
+ * @returns {com.miti99.netty.fbs.Player|null}
+ */
+com.miti99.netty.fbs.LoginResponse.prototype.player = function(obj) {
+  var offset = this.bb.__offset(this.bb_pos, 4);
+  return offset ? (obj || new com.miti99.netty.fbs.Player).__init(this.bb.__indirect(this.bb_pos + offset), this.bb) : null;
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ */
+com.miti99.netty.fbs.LoginResponse.startLoginResponse = function(builder) {
+  builder.startObject(1);
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {flatbuffers.Offset} playerOffset
+ */
+com.miti99.netty.fbs.LoginResponse.addPlayer = function(builder, playerOffset) {
+  builder.addFieldOffset(0, playerOffset, 0);
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @returns {flatbuffers.Offset}
+ */
+com.miti99.netty.fbs.LoginResponse.endLoginResponse = function(builder) {
+  var offset = builder.endObject();
+  return offset;
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {flatbuffers.Offset} playerOffset
+ * @returns {flatbuffers.Offset}
+ */
+com.miti99.netty.fbs.LoginResponse.createLoginResponse = function(builder, playerOffset) {
+  com.miti99.netty.fbs.LoginResponse.startLoginResponse(builder);
+  com.miti99.netty.fbs.LoginResponse.addPlayer(builder, playerOffset);
+  return com.miti99.netty.fbs.LoginResponse.endLoginResponse(builder);
+}
+
+/**
+ * @constructor
+ */
+com.miti99.netty.fbs.Packet = function() {
+  /**
+   * @type {flatbuffers.ByteBuffer}
+   */
+  this.bb = null;
+
+  /**
+   * @type {number}
+   */
+  this.bb_pos = 0;
+};
+
+/**
+ * @param {number} i
+ * @param {flatbuffers.ByteBuffer} bb
+ * @returns {com.miti99.netty.fbs.Packet}
+ */
+com.miti99.netty.fbs.Packet.prototype.__init = function(i, bb) {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+};
+
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {com.miti99.netty.fbs.Packet=} obj
+ * @returns {com.miti99.netty.fbs.Packet}
+ */
+com.miti99.netty.fbs.Packet.getRootAsPacket = function(bb, obj) {
+  return (obj || new com.miti99.netty.fbs.Packet).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
+/**
+ * @param {flatbuffers.ByteBuffer} bb
+ * @param {com.miti99.netty.fbs.Packet=} obj
+ * @returns {com.miti99.netty.fbs.Packet}
+ */
+com.miti99.netty.fbs.Packet.getSizePrefixedRootAsPacket = function(bb, obj) {
+  bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+  return (obj || new com.miti99.netty.fbs.Packet).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+};
+
+/**
+ * @returns {com.miti99.netty.fbs.PacketData}
+ */
+com.miti99.netty.fbs.Packet.prototype.dataType = function() {
+  var offset = this.bb.__offset(this.bb_pos, 4);
+  return offset ? /** @type {com.miti99.netty.fbs.PacketData} */ (this.bb.readUint8(this.bb_pos + offset)) : com.miti99.netty.fbs.PacketData.NONE;
+};
+
+/**
+ * @param {flatbuffers.Table} obj
+ * @returns {?flatbuffers.Table}
+ */
+com.miti99.netty.fbs.Packet.prototype.data = function(obj) {
+  var offset = this.bb.__offset(this.bb_pos, 6);
+  return offset ? this.bb.__union(obj, this.bb_pos + offset) : null;
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ */
+com.miti99.netty.fbs.Packet.startPacket = function(builder) {
+  builder.startObject(2);
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {com.miti99.netty.fbs.PacketData} dataType
+ */
+com.miti99.netty.fbs.Packet.addDataType = function(builder, dataType) {
+  builder.addFieldInt8(0, dataType, com.miti99.netty.fbs.PacketData.NONE);
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {flatbuffers.Offset} dataOffset
+ */
+com.miti99.netty.fbs.Packet.addData = function(builder, dataOffset) {
+  builder.addFieldOffset(1, dataOffset, 0);
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @returns {flatbuffers.Offset}
+ */
+com.miti99.netty.fbs.Packet.endPacket = function(builder) {
+  var offset = builder.endObject();
+  return offset;
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {flatbuffers.Offset} offset
+ */
+com.miti99.netty.fbs.Packet.finishPacketBuffer = function(builder, offset) {
+  builder.finish(offset);
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {flatbuffers.Offset} offset
+ */
+com.miti99.netty.fbs.Packet.finishSizePrefixedPacketBuffer = function(builder, offset) {
+  builder.finish(offset, undefined, true);
+};
+
+/**
+ * @param {flatbuffers.Builder} builder
+ * @param {com.miti99.netty.fbs.PacketData} dataType
+ * @param {flatbuffers.Offset} dataOffset
+ * @returns {flatbuffers.Offset}
+ */
+com.miti99.netty.fbs.Packet.createPacket = function(builder, dataType, dataOffset) {
+  com.miti99.netty.fbs.Packet.startPacket(builder);
+  com.miti99.netty.fbs.Packet.addDataType(builder, dataType);
+  com.miti99.netty.fbs.Packet.addData(builder, dataOffset);
+  return com.miti99.netty.fbs.Packet.endPacket(builder);
+}
+
+// Exports for Node.js and RequireJS
+this.com = com;
diff --git a/netty/pom.xml b/netty/pom.xml
new file mode 100644
index 0000000..01e58ca
--- /dev/null
+++ b/netty/pom.xml
@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xmlns="http://maven.apache.org/POM/4.0.0"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+  <artifactId>learn-netty</artifactId>
+
+  <dependencies>
+    <dependency>
+      <artifactId>gson</artifactId>
+      <groupId>com.google.code.gson</groupId>
+      <version>2.10.1</version>
+    </dependency>
+    <dependency>
+      <artifactId>logback-classic</artifactId>
+      <groupId>ch.qos.logback</groupId>
+      <version>1.4.6</version>
+    </dependency>
+    <dependency>
+      <artifactId>flatbuffers-java</artifactId>
+      <groupId>com.google.flatbuffers</groupId>
+      <version>1.12.0</version>
+    </dependency>
+    <dependency>
+      <artifactId>netty-all</artifactId>
+      <groupId>io.netty</groupId>
+      <scope>compile</scope>
+      <version>4.1.89.Final</version>
+    </dependency>
+    <dependency>
+      <artifactId>junit-jupiter</artifactId>
+      <groupId>org.junit.jupiter</groupId>
+      <scope>test</scope>
+      <version>5.9.2</version>
+    </dependency>
+    <dependency>
+      <artifactId>lombok</artifactId>
+      <groupId>org.projectlombok</groupId>
+      <scope>provided</scope>
+      <version>1.18.26</version>
+    </dependency>
+  </dependencies>
+
+  <groupId>com.miti99</groupId>
+  <modelVersion>4.0.0</modelVersion>
+
+  <modules>
+    <module>server</module>
+  </modules>
+
+  <packaging>pom</packaging>
+
+  <properties>
+    <maven.compiler.source>17</maven.compiler.source>
+    <maven.compiler.target>17</maven.compiler.target>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <version>1.0-SNAPSHOT</version>
+
+</project>
diff --git a/netty/server/pom.xml b/netty/server/pom.xml
index 8f19535..8d3b016 100644
--- a/netty/server/pom.xml
+++ b/netty/server/pom.xml
@@ -2,47 +2,17 @@
 <project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns="http://maven.apache.org/POM/4.0.0"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
   <artifactId>server</artifactId>
 
-  <dependencies>
-    <dependency>
-      <artifactId>logback-classic</artifactId>
-      <groupId>ch.qos.logback</groupId>
-      <version>1.4.5</version>
-    </dependency>
-    <dependency>
-      <artifactId>flatbuffers-java</artifactId>
-      <groupId>com.google.flatbuffers</groupId>
-      <version>1.12.0</version>
-    </dependency>
-    <dependency>
-      <artifactId>netty-all</artifactId>
-      <groupId>io.netty</groupId>
-      <scope>compile</scope>
-      <version>4.1.89.Final</version>
-    </dependency>
-    <dependency>
-      <artifactId>junit-jupiter</artifactId>
-      <groupId>org.junit.jupiter</groupId>
-      <scope>test</scope>
-      <version>5.9.2</version>
-    </dependency>
-    <dependency>
-      <artifactId>lombok</artifactId>
-      <groupId>org.projectlombok</groupId>
-      <scope>provided</scope>
-      <version>1.18.26</version>
-    </dependency>
-  </dependencies>
-  <groupId>com.miti99</groupId>
   <modelVersion>4.0.0</modelVersion>
 
-  <properties>
-    <maven.compiler.source>17</maven.compiler.source>
-    <maven.compiler.target>17</maven.compiler.target>
-    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-  </properties>
+  <parent>
+    <groupId>com.miti99</groupId>
+    <artifactId>learn-netty</artifactId>
+    <version>1.0-SNAPSHOT</version>
+  </parent>
 
-  <version>1.0-SNAPSHOT</version>
+  <version>${parent.version}</version>
 
 </project>
diff --git a/netty/server/src/main/java/MyGame/Sample/Color.java b/netty/server/src/main/java/MyGame/Sample/Color.java
deleted file mode 100644
index 18bce4c..0000000
--- a/netty/server/src/main/java/MyGame/Sample/Color.java
+++ /dev/null
@@ -1,15 +0,0 @@
-// automatically generated by the FlatBuffers compiler, do not modify
-
-package MyGame.Sample;
-
-public final class Color {
-  private Color() { }
-  public static final byte Red = 0;
-  public static final byte Green = 1;
-  public static final byte Blue = 2;
-
-  public static final String[] names = { "Red", "Green", "Blue", };
-
-  public static String name(int e) { return names[e]; }
-}
-
diff --git a/netty/server/src/main/java/MyGame/Sample/Equipment.java b/netty/server/src/main/java/MyGame/Sample/Equipment.java
deleted file mode 100644
index 0618cae..0000000
--- a/netty/server/src/main/java/MyGame/Sample/Equipment.java
+++ /dev/null
@@ -1,14 +0,0 @@
-// automatically generated by the FlatBuffers compiler, do not modify
-
-package MyGame.Sample;
-
-public final class Equipment {
-  private Equipment() { }
-  public static final byte NONE = 0;
-  public static final byte Weapon = 1;
-
-  public static final String[] names = { "NONE", "Weapon", };
-
-  public static String name(int e) { return names[e]; }
-}
-
diff --git a/netty/server/src/main/java/MyGame/Sample/Monster.java b/netty/server/src/main/java/MyGame/Sample/Monster.java
deleted file mode 100644
index d71e79d..0000000
--- a/netty/server/src/main/java/MyGame/Sample/Monster.java
+++ /dev/null
@@ -1,76 +0,0 @@
-// automatically generated by the FlatBuffers compiler, do not modify
-
-package MyGame.Sample;
-
-import java.nio.*;
-import java.lang.*;
-import java.util.*;
-import com.google.flatbuffers.*;
-
-@SuppressWarnings("unused")
-public final class Monster extends Table {
-  public static void ValidateVersion() { Constants.FLATBUFFERS_1_12_0(); }
-  public static Monster getRootAsMonster(ByteBuffer _bb) { return getRootAsMonster(_bb, new Monster()); }
-  public static Monster getRootAsMonster(ByteBuffer _bb, Monster obj) { _bb.order(ByteOrder.LITTLE_ENDIAN); return (obj.__assign(_bb.getInt(_bb.position()) + _bb.position(), _bb)); }
-  public void __init(int _i, ByteBuffer _bb) { __reset(_i, _bb); }
-  public Monster __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
-
-  public MyGame.Sample.Vec3 pos() { return pos(new MyGame.Sample.Vec3()); }
-  public MyGame.Sample.Vec3 pos(MyGame.Sample.Vec3 obj) { int o = __offset(4); return o != 0 ? obj.__assign(o + bb_pos, bb) : null; }
-  public short mana() { int o = __offset(6); return o != 0 ? bb.getShort(o + bb_pos) : 150; }
-  public short hp() { int o = __offset(8); return o != 0 ? bb.getShort(o + bb_pos) : 100; }
-  public String name() { int o = __offset(10); return o != 0 ? __string(o + bb_pos) : null; }
-  public ByteBuffer nameAsByteBuffer() { return __vector_as_bytebuffer(10, 1); }
-  public ByteBuffer nameInByteBuffer(ByteBuffer _bb) { return __vector_in_bytebuffer(_bb, 10, 1); }
-  public int inventory(int j) { int o = __offset(14); return o != 0 ? bb.get(__vector(o) + j * 1) & 0xFF : 0; }
-  public int inventoryLength() { int o = __offset(14); return o != 0 ? __vector_len(o) : 0; }
-  public ByteVector inventoryVector() { return inventoryVector(new ByteVector()); }
-  public ByteVector inventoryVector(ByteVector obj) { int o = __offset(14); return o != 0 ? obj.__assign(__vector(o), bb) : null; }
-  public ByteBuffer inventoryAsByteBuffer() { return __vector_as_bytebuffer(14, 1); }
-  public ByteBuffer inventoryInByteBuffer(ByteBuffer _bb) { return __vector_in_bytebuffer(_bb, 14, 1); }
-  public byte color() { int o = __offset(16); return o != 0 ? bb.get(o + bb_pos) : 2; }
-  public MyGame.Sample.Weapon weapons(int j) { return weapons(new MyGame.Sample.Weapon(), j); }
-  public MyGame.Sample.Weapon weapons(MyGame.Sample.Weapon obj, int j) { int o = __offset(18); return o != 0 ? obj.__assign(__indirect(__vector(o) + j * 4), bb) : null; }
-  public int weaponsLength() { int o = __offset(18); return o != 0 ? __vector_len(o) : 0; }
-  public MyGame.Sample.Weapon.Vector weaponsVector() { return weaponsVector(new MyGame.Sample.Weapon.Vector()); }
-  public MyGame.Sample.Weapon.Vector weaponsVector(MyGame.Sample.Weapon.Vector obj) { int o = __offset(18); return o != 0 ? obj.__assign(__vector(o), 4, bb) : null; }
-  public byte equippedType() { int o = __offset(20); return o != 0 ? bb.get(o + bb_pos) : 0; }
-  public Table equipped(Table obj) { int o = __offset(22); return o != 0 ? __union(obj, o + bb_pos) : null; }
-  public MyGame.Sample.Vec3 path(int j) { return path(new MyGame.Sample.Vec3(), j); }
-  public MyGame.Sample.Vec3 path(MyGame.Sample.Vec3 obj, int j) { int o = __offset(24); return o != 0 ? obj.__assign(__vector(o) + j * 12, bb) : null; }
-  public int pathLength() { int o = __offset(24); return o != 0 ? __vector_len(o) : 0; }
-  public MyGame.Sample.Vec3.Vector pathVector() { return pathVector(new MyGame.Sample.Vec3.Vector()); }
-  public MyGame.Sample.Vec3.Vector pathVector(MyGame.Sample.Vec3.Vector obj) { int o = __offset(24); return o != 0 ? obj.__assign(__vector(o), 12, bb) : null; }
-
-  public static void startMonster(FlatBufferBuilder builder) { builder.startTable(11); }
-  public static void addPos(FlatBufferBuilder builder, int posOffset) { builder.addStruct(0, posOffset, 0); }
-  public static void addMana(FlatBufferBuilder builder, short mana) { builder.addShort(1, mana, 150); }
-  public static void addHp(FlatBufferBuilder builder, short hp) { builder.addShort(2, hp, 100); }
-  public static void addName(FlatBufferBuilder builder, int nameOffset) { builder.addOffset(3, nameOffset, 0); }
-  public static void addInventory(FlatBufferBuilder builder, int inventoryOffset) { builder.addOffset(5, inventoryOffset, 0); }
-  public static int createInventoryVector(FlatBufferBuilder builder, byte[] data) { return builder.createByteVector(data); }
-  public static int createInventoryVector(FlatBufferBuilder builder, ByteBuffer data) { return builder.createByteVector(data); }
-  public static void startInventoryVector(FlatBufferBuilder builder, int numElems) { builder.startVector(1, numElems, 1); }
-  public static void addColor(FlatBufferBuilder builder, byte color) { builder.addByte(6, color, 2); }
-  public static void addWeapons(FlatBufferBuilder builder, int weaponsOffset) { builder.addOffset(7, weaponsOffset, 0); }
-  public static int createWeaponsVector(FlatBufferBuilder builder, int[] data) { builder.startVector(4, data.length, 4); for (int i = data.length - 1; i >= 0; i--) builder.addOffset(data[i]); return builder.endVector(); }
-  public static void startWeaponsVector(FlatBufferBuilder builder, int numElems) { builder.startVector(4, numElems, 4); }
-  public static void addEquippedType(FlatBufferBuilder builder, byte equippedType) { builder.addByte(8, equippedType, 0); }
-  public static void addEquipped(FlatBufferBuilder builder, int equippedOffset) { builder.addOffset(9, equippedOffset, 0); }
-  public static void addPath(FlatBufferBuilder builder, int pathOffset) { builder.addOffset(10, pathOffset, 0); }
-  public static void startPathVector(FlatBufferBuilder builder, int numElems) { builder.startVector(12, numElems, 4); }
-  public static int endMonster(FlatBufferBuilder builder) {
-    int o = builder.endTable();
-    return o;
-  }
-  public static void finishMonsterBuffer(FlatBufferBuilder builder, int offset) { builder.finish(offset); }
-  public static void finishSizePrefixedMonsterBuffer(FlatBufferBuilder builder, int offset) { builder.finishSizePrefixed(offset); }
-
-  public static final class Vector extends BaseVector {
-    public Vector __assign(int _vector, int _element_size, ByteBuffer _bb) { __reset(_vector, _element_size, _bb); return this; }
-
-    public Monster get(int j) { return get(new Monster(), j); }
-    public Monster get(Monster obj, int j) {  return obj.__assign(__indirect(__element(j), bb), bb); }
-  }
-}
-
diff --git a/netty/server/src/main/java/MyGame/Sample/Vec3.java b/netty/server/src/main/java/MyGame/Sample/Vec3.java
deleted file mode 100644
index 2673c01..0000000
--- a/netty/server/src/main/java/MyGame/Sample/Vec3.java
+++ /dev/null
@@ -1,34 +0,0 @@
-// automatically generated by the FlatBuffers compiler, do not modify
-
-package MyGame.Sample;
-
-import java.nio.*;
-import java.lang.*;
-import java.util.*;
-import com.google.flatbuffers.*;
-
-@SuppressWarnings("unused")
-public final class Vec3 extends Struct {
-  public void __init(int _i, ByteBuffer _bb) { __reset(_i, _bb); }
-  public Vec3 __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
-
-  public float x() { return bb.getFloat(bb_pos + 0); }
-  public float y() { return bb.getFloat(bb_pos + 4); }
-  public float z() { return bb.getFloat(bb_pos + 8); }
-
-  public static int createVec3(FlatBufferBuilder builder, float x, float y, float z) {
-    builder.prep(4, 12);
-    builder.putFloat(z);
-    builder.putFloat(y);
-    builder.putFloat(x);
-    return builder.offset();
-  }
-
-  public static final class Vector extends BaseVector {
-    public Vector __assign(int _vector, int _element_size, ByteBuffer _bb) { __reset(_vector, _element_size, _bb); return this; }
-
-    public Vec3 get(int j) { return get(new Vec3(), j); }
-    public Vec3 get(Vec3 obj, int j) {  return obj.__assign(__element(j), bb); }
-  }
-}
-
diff --git a/netty/server/src/main/java/MyGame/Sample/Weapon.java b/netty/server/src/main/java/MyGame/Sample/Weapon.java
deleted file mode 100644
index 8401f2a..0000000
--- a/netty/server/src/main/java/MyGame/Sample/Weapon.java
+++ /dev/null
@@ -1,47 +0,0 @@
-// automatically generated by the FlatBuffers compiler, do not modify
-
-package MyGame.Sample;
-
-import java.nio.*;
-import java.lang.*;
-import java.util.*;
-import com.google.flatbuffers.*;
-
-@SuppressWarnings("unused")
-public final class Weapon extends Table {
-  public static void ValidateVersion() { Constants.FLATBUFFERS_1_12_0(); }
-  public static Weapon getRootAsWeapon(ByteBuffer _bb) { return getRootAsWeapon(_bb, new Weapon()); }
-  public static Weapon getRootAsWeapon(ByteBuffer _bb, Weapon obj) { _bb.order(ByteOrder.LITTLE_ENDIAN); return (obj.__assign(_bb.getInt(_bb.position()) + _bb.position(), _bb)); }
-  public void __init(int _i, ByteBuffer _bb) { __reset(_i, _bb); }
-  public Weapon __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
-
-  public String name() { int o = __offset(4); return o != 0 ? __string(o + bb_pos) : null; }
-  public ByteBuffer nameAsByteBuffer() { return __vector_as_bytebuffer(4, 1); }
-  public ByteBuffer nameInByteBuffer(ByteBuffer _bb) { return __vector_in_bytebuffer(_bb, 4, 1); }
-  public short damage() { int o = __offset(6); return o != 0 ? bb.getShort(o + bb_pos) : 0; }
-
-  public static int createWeapon(FlatBufferBuilder builder,
-      int nameOffset,
-      short damage) {
-    builder.startTable(2);
-    Weapon.addName(builder, nameOffset);
-    Weapon.addDamage(builder, damage);
-    return Weapon.endWeapon(builder);
-  }
-
-  public static void startWeapon(FlatBufferBuilder builder) { builder.startTable(2); }
-  public static void addName(FlatBufferBuilder builder, int nameOffset) { builder.addOffset(0, nameOffset, 0); }
-  public static void addDamage(FlatBufferBuilder builder, short damage) { builder.addShort(1, damage, 0); }
-  public static int endWeapon(FlatBufferBuilder builder) {
-    int o = builder.endTable();
-    return o;
-  }
-
-  public static final class Vector extends BaseVector {
-    public Vector __assign(int _vector, int _element_size, ByteBuffer _bb) { __reset(_vector, _element_size, _bb); return this; }
-
-    public Weapon get(int j) { return get(new Weapon(), j); }
-    public Weapon get(Weapon obj, int j) {  return obj.__assign(__indirect(__element(j), bb), bb); }
-  }
-}
-
diff --git a/netty/server/src/main/java/com/miti99/netty/Main.java b/netty/server/src/main/java/com/miti99/netty/Main.java
index bd70c7d..340373c 100644
--- a/netty/server/src/main/java/com/miti99/netty/Main.java
+++ b/netty/server/src/main/java/com/miti99/netty/Main.java
@@ -27,29 +27,33 @@ public class Main {
     var childGroup = Epoll.isAvailable() ? new EpollEventLoopGroup() : new NioEventLoopGroup();
 
     val serverBootstrap = new ServerBootstrap();
-    serverBootstrap.group(parentGroup, childGroup).channel(
-            NioServerSocketChannel.class
-        ).handler(new LoggingHandler(LogLevel.DEBUG))
-        .childHandler(new ChannelInitializer<>() {
-
-          @Override
-          protected void initChannel(Channel channel) {
-            channel.pipeline()
-                .addLast(new LoggingHandler(LogLevel.DEBUG))
-                .addLast(new HttpServerCodec())
-                .addLast(new HttpObjectAggregator(65536))
-                .addLast(new WebSocketServerCompressionHandler())
-                .addLast(new WebSocketServerProtocolHandler("/fbs", null, true))
-                .addLast(new WebsocketDecoder())
-                .addLast(new WebsocketHandler());
-          }
-        })
+    serverBootstrap
+        .group(parentGroup, childGroup)
+        .channel(NioServerSocketChannel.class)
+        .handler(new LoggingHandler(LogLevel.DEBUG))
         .childHandler(
             new ChannelInitializer<>() {
 
               @Override
               protected void initChannel(Channel channel) {
-                channel.pipeline()
+                channel
+                    .pipeline()
+                    .addLast(new LoggingHandler(LogLevel.DEBUG))
+                    .addLast(new HttpServerCodec())
+                    .addLast(new HttpObjectAggregator(65536))
+                    .addLast(new WebSocketServerCompressionHandler())
+                    .addLast(new WebSocketServerProtocolHandler("/fbs", null, true))
+                    .addLast(new WebsocketDecoder())
+                    .addLast(new WebsocketHandler());
+              }
+            })
+        .childHandler(
+            new ChannelInitializer<>() {
+
+              @Override
+              protected void initChannel(Channel channel) {
+                channel
+                    .pipeline()
                     .addLast(new LoggingHandler(LogLevel.INFO))
                     .addLast(new HttpServerCodec())
                     .addLast(new HttpObjectAggregator(65536))
@@ -57,8 +61,7 @@ public class Main {
                     .addLast(new WebSocketServerProtocolHandler("/json", null, true))
                     .addLast(new WebsocketHandler());
               }
-            }
-        );
+            });
 
     try {
       val channelFuture = serverBootstrap.bind(1202).sync();
diff --git a/netty/server/src/main/java/com/miti99/netty/NetworkUtil.java b/netty/server/src/main/java/com/miti99/netty/NetworkUtil.java
new file mode 100644
index 0000000..1d203c0
--- /dev/null
+++ b/netty/server/src/main/java/com/miti99/netty/NetworkUtil.java
@@ -0,0 +1,24 @@
+package com.miti99.netty;
+
+import com.miti99.netty.json.response.BaseJsonResponse;
+import io.netty.channel.Channel;
+import java.nio.ByteBuffer;
+
+public class NetworkUtil {
+
+  public static void sendJsonResponse(Channel channel, BaseJsonResponse response) {
+    sendTextResponse(channel, response.toJson());
+  }
+
+  public static void sendTextResponse(Channel channel, String response) {
+    channel.writeAndFlush(response);
+  }
+
+  public static void sendBinaryResponse(Channel channel, ByteBuffer byteBuffer) {
+    channel.writeAndFlush(byteBuffer);
+  }
+
+  public static void sendBinaryResponse(Channel channel, byte[] bytes) {
+    channel.writeAndFlush(bytes);
+  }
+}
diff --git a/netty/server/src/main/java/com/miti99/netty/WebsocketDecoder.java b/netty/server/src/main/java/com/miti99/netty/WebsocketDecoder.java
index b8c9ebf..4da63f3 100644
--- a/netty/server/src/main/java/com/miti99/netty/WebsocketDecoder.java
+++ b/netty/server/src/main/java/com/miti99/netty/WebsocketDecoder.java
@@ -1,6 +1,6 @@
 package com.miti99.netty;
 
-import MyGame.Sample.Monster;
+import com.miti99.netty.fbs.Packet;
 import io.netty.buffer.ByteBufUtil;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.MessageToMessageDecoder;
@@ -14,8 +14,10 @@ import lombok.extern.slf4j.Slf4j;
 public class WebsocketDecoder extends MessageToMessageDecoder<BinaryWebSocketFrame> {
 
   @Override
-  protected void decode(ChannelHandlerContext channelHandlerContext,
-      BinaryWebSocketFrame binaryWebSocketFrame, List<Object> list) {
+  protected void decode(
+      ChannelHandlerContext channelHandlerContext,
+      BinaryWebSocketFrame binaryWebSocketFrame,
+      List<Object> list) {
     var byteBuf = binaryWebSocketFrame.content();
     byteBuf.retain();
 
@@ -25,8 +27,8 @@ public class WebsocketDecoder extends MessageToMessageDecoder<BinaryWebSocketFra
 
     var byteBuffer = ByteBuffer.wrap(bytes);
 
-    var monster = Monster.getRootAsMonster(byteBuffer);
+    var packet = Packet.getRootAsPacket(byteBuffer);
 
-    list.add(monster);
+    list.add(packet);
   }
 }
diff --git a/netty/server/src/main/java/com/miti99/netty/WebsocketHandler.java b/netty/server/src/main/java/com/miti99/netty/WebsocketHandler.java
index c63bfc4..5f82c94 100644
--- a/netty/server/src/main/java/com/miti99/netty/WebsocketHandler.java
+++ b/netty/server/src/main/java/com/miti99/netty/WebsocketHandler.java
@@ -1,10 +1,15 @@
 package com.miti99.netty;
 
-
-
-import MyGame.Sample.Equipment;
-import MyGame.Sample.Monster;
-import MyGame.Sample.Weapon;
+import com.google.flatbuffers.FlatBufferBuilder;
+import com.google.gson.Gson;
+import com.miti99.netty.fbs.LoginRequest;
+import com.miti99.netty.fbs.LoginResponse;import com.miti99.netty.fbs.Packet;
+import com.miti99.netty.fbs.PacketData;
+import com.miti99.netty.fbs.Player;
+import com.miti99.netty.fbs.Vec2;
+import com.miti99.netty.json.request.BaseJsonRequest;
+import com.miti99.netty.json.request.LoginJsonRequest;
+import com.miti99.netty.json.response.LoginJsonResponse;
 import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelInboundHandlerAdapter;
@@ -17,44 +22,48 @@ public class WebsocketHandler extends ChannelInboundHandlerAdapter {
 
   @Override
   public void channelRead(ChannelHandlerContext ctx, Object msg) {
-    if (msg instanceof Monster monster) {
-      var hp = monster.hp();
-      var mana = monster.mana();
-      var name = monster.name();
+    if (msg instanceof Packet packet) {
+      if (packet.dataType() == PacketData.LoginRequest) {
+        var request = new LoginRequest();
+        packet.data(request);
+        var builder = new FlatBufferBuilder(0);
 
-      log.info("hp : {}, mana : {}, name : {}", hp, mana, name);
+        var usernameOffset = builder.createString("user_" + request.userId());
+        Player.startPlayer(builder);
+        Player.addUserId(builder, request.userId());
+        Player.addUserName(builder, usernameOffset);
+        Player.addPosition(builder, Vec2.createVec2(builder, 12, 2));
+        Player.addRotation(builder, 12.02);
+        Player.addTeam(builder, 1999);
+        var playerOffset = Player.endPlayer(builder);
 
-      var pos = monster.pos();
-      var x = pos.x();
-      var y = pos.y();
-      var z = pos.z();
+        var responseOffset = LoginResponse.createLoginResponse(builder, playerOffset);
 
-      log.info("x : {}, y : {}, z : {}", x, y, z);
+        Packet.startPacket(builder);
+        Packet.addDataType(builder, PacketData.LoginResponse);
+        Packet.addData(builder, responseOffset);
+        var packetOffset = Packet.endPacket(builder);
+        builder.finish(packetOffset);
 
-      var invLength = monster.inventoryLength();
-      var thirdItem = monster.inventory(2);
-
-      var weaponsLength = monster.weaponsLength();
-      var secondWeaponName = monster.weapons(1).name();
-      var secondWeaponDamage = monster.weapons(1).damage();
-
-      log.info(
-          "invLength : {}, thirdItem : {}, weaponsLength : {}, secondWeaponName : {}, secondWeaponDamage : {}",
-          invLength, thirdItem, weaponsLength, secondWeaponName, secondWeaponDamage);
-
-      var unionType = monster.equippedType();
-
-      if (unionType == Equipment.Weapon) {
-        var weapon = (Weapon) monster.equipped(new Weapon());
-
-        var weaponName = weapon.name();    // "Axe"
-        var weaponDamage = weapon.damage(); // 5
-
-        log.info("weaponName : {}, weaponDamage : {}", weaponName, weaponDamage);
+        var bytes = builder.dataBuffer();
+        NetworkUtil.sendBinaryResponse(ctx.channel(), bytes);
+      } else {
+        log.warn("unknown packet data type: {}", packet.dataType());
       }
     } else if (msg instanceof TextWebSocketFrame textWebSocketFrame) {
-      log.info(textWebSocketFrame.text());
-    }else {
+      try {
+        BaseJsonRequest request = BaseJsonRequest.fromJson(textWebSocketFrame.text());
+        if (request instanceof LoginJsonRequest loginRequest) {
+          var response =
+              new LoginJsonResponse(loginRequest.getUserId(), "user_" + loginRequest.getUserId());
+          NetworkUtil.sendJsonResponse(ctx.channel(), response);
+        } else {
+          NetworkUtil.sendTextResponse(ctx.channel(), new Gson().toJson(request));
+        }
+      } catch (Exception e) {
+        log.error("can not parse text message: {}", textWebSocketFrame.text(), e);
+      }
+    } else {
       ctx.fireChannelRead(msg);
     }
   }
diff --git a/netty/server/src/main/java/com/miti99/netty/fbs/LoginRequest.java b/netty/server/src/main/java/com/miti99/netty/fbs/LoginRequest.java
new file mode 100644
index 0000000..8088715
--- /dev/null
+++ b/netty/server/src/main/java/com/miti99/netty/fbs/LoginRequest.java
@@ -0,0 +1,41 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+package com.miti99.netty.fbs;
+
+import java.nio.*;
+import java.lang.*;
+import java.util.*;
+import com.google.flatbuffers.*;
+
+@SuppressWarnings("unused")
+public final class LoginRequest extends Table {
+  public static void ValidateVersion() { Constants.FLATBUFFERS_1_12_0(); }
+  public static LoginRequest getRootAsLoginRequest(ByteBuffer _bb) { return getRootAsLoginRequest(_bb, new LoginRequest()); }
+  public static LoginRequest getRootAsLoginRequest(ByteBuffer _bb, LoginRequest obj) { _bb.order(ByteOrder.LITTLE_ENDIAN); return (obj.__assign(_bb.getInt(_bb.position()) + _bb.position(), _bb)); }
+  public void __init(int _i, ByteBuffer _bb) { __reset(_i, _bb); }
+  public LoginRequest __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
+
+  public int userId() { int o = __offset(4); return o != 0 ? bb.getInt(o + bb_pos) : 0; }
+
+  public static int createLoginRequest(FlatBufferBuilder builder,
+      int userId) {
+    builder.startTable(1);
+    LoginRequest.addUserId(builder, userId);
+    return LoginRequest.endLoginRequest(builder);
+  }
+
+  public static void startLoginRequest(FlatBufferBuilder builder) { builder.startTable(1); }
+  public static void addUserId(FlatBufferBuilder builder, int userId) { builder.addInt(0, userId, 0); }
+  public static int endLoginRequest(FlatBufferBuilder builder) {
+    int o = builder.endTable();
+    return o;
+  }
+
+  public static final class Vector extends BaseVector {
+    public Vector __assign(int _vector, int _element_size, ByteBuffer _bb) { __reset(_vector, _element_size, _bb); return this; }
+
+    public LoginRequest get(int j) { return get(new LoginRequest(), j); }
+    public LoginRequest get(LoginRequest obj, int j) {  return obj.__assign(__indirect(__element(j), bb), bb); }
+  }
+}
+
diff --git a/netty/server/src/main/java/com/miti99/netty/fbs/LoginResponse.java b/netty/server/src/main/java/com/miti99/netty/fbs/LoginResponse.java
new file mode 100644
index 0000000..5996217
--- /dev/null
+++ b/netty/server/src/main/java/com/miti99/netty/fbs/LoginResponse.java
@@ -0,0 +1,42 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+package com.miti99.netty.fbs;
+
+import java.nio.*;
+import java.lang.*;
+import java.util.*;
+import com.google.flatbuffers.*;
+
+@SuppressWarnings("unused")
+public final class LoginResponse extends Table {
+  public static void ValidateVersion() { Constants.FLATBUFFERS_1_12_0(); }
+  public static LoginResponse getRootAsLoginResponse(ByteBuffer _bb) { return getRootAsLoginResponse(_bb, new LoginResponse()); }
+  public static LoginResponse getRootAsLoginResponse(ByteBuffer _bb, LoginResponse obj) { _bb.order(ByteOrder.LITTLE_ENDIAN); return (obj.__assign(_bb.getInt(_bb.position()) + _bb.position(), _bb)); }
+  public void __init(int _i, ByteBuffer _bb) { __reset(_i, _bb); }
+  public LoginResponse __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
+
+  public com.miti99.netty.fbs.Player player() { return player(new com.miti99.netty.fbs.Player()); }
+  public com.miti99.netty.fbs.Player player(com.miti99.netty.fbs.Player obj) { int o = __offset(4); return o != 0 ? obj.__assign(__indirect(o + bb_pos), bb) : null; }
+
+  public static int createLoginResponse(FlatBufferBuilder builder,
+      int playerOffset) {
+    builder.startTable(1);
+    LoginResponse.addPlayer(builder, playerOffset);
+    return LoginResponse.endLoginResponse(builder);
+  }
+
+  public static void startLoginResponse(FlatBufferBuilder builder) { builder.startTable(1); }
+  public static void addPlayer(FlatBufferBuilder builder, int playerOffset) { builder.addOffset(0, playerOffset, 0); }
+  public static int endLoginResponse(FlatBufferBuilder builder) {
+    int o = builder.endTable();
+    return o;
+  }
+
+  public static final class Vector extends BaseVector {
+    public Vector __assign(int _vector, int _element_size, ByteBuffer _bb) { __reset(_vector, _element_size, _bb); return this; }
+
+    public LoginResponse get(int j) { return get(new LoginResponse(), j); }
+    public LoginResponse get(LoginResponse obj, int j) {  return obj.__assign(__indirect(__element(j), bb), bb); }
+  }
+}
+
diff --git a/netty/server/src/main/java/com/miti99/netty/fbs/Packet.java b/netty/server/src/main/java/com/miti99/netty/fbs/Packet.java
new file mode 100644
index 0000000..3afa590
--- /dev/null
+++ b/netty/server/src/main/java/com/miti99/netty/fbs/Packet.java
@@ -0,0 +1,47 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+package com.miti99.netty.fbs;
+
+import java.nio.*;
+import java.lang.*;
+import java.util.*;
+import com.google.flatbuffers.*;
+
+@SuppressWarnings("unused")
+public final class Packet extends Table {
+  public static void ValidateVersion() { Constants.FLATBUFFERS_1_12_0(); }
+  public static Packet getRootAsPacket(ByteBuffer _bb) { return getRootAsPacket(_bb, new Packet()); }
+  public static Packet getRootAsPacket(ByteBuffer _bb, Packet obj) { _bb.order(ByteOrder.LITTLE_ENDIAN); return (obj.__assign(_bb.getInt(_bb.position()) + _bb.position(), _bb)); }
+  public void __init(int _i, ByteBuffer _bb) { __reset(_i, _bb); }
+  public Packet __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
+
+  public byte dataType() { int o = __offset(4); return o != 0 ? bb.get(o + bb_pos) : 0; }
+  public Table data(Table obj) { int o = __offset(6); return o != 0 ? __union(obj, o + bb_pos) : null; }
+
+  public static int createPacket(FlatBufferBuilder builder,
+      byte data_type,
+      int dataOffset) {
+    builder.startTable(2);
+    Packet.addData(builder, dataOffset);
+    Packet.addDataType(builder, data_type);
+    return Packet.endPacket(builder);
+  }
+
+  public static void startPacket(FlatBufferBuilder builder) { builder.startTable(2); }
+  public static void addDataType(FlatBufferBuilder builder, byte dataType) { builder.addByte(0, dataType, 0); }
+  public static void addData(FlatBufferBuilder builder, int dataOffset) { builder.addOffset(1, dataOffset, 0); }
+  public static int endPacket(FlatBufferBuilder builder) {
+    int o = builder.endTable();
+    return o;
+  }
+  public static void finishPacketBuffer(FlatBufferBuilder builder, int offset) { builder.finish(offset); }
+  public static void finishSizePrefixedPacketBuffer(FlatBufferBuilder builder, int offset) { builder.finishSizePrefixed(offset); }
+
+  public static final class Vector extends BaseVector {
+    public Vector __assign(int _vector, int _element_size, ByteBuffer _bb) { __reset(_vector, _element_size, _bb); return this; }
+
+    public Packet get(int j) { return get(new Packet(), j); }
+    public Packet get(Packet obj, int j) {  return obj.__assign(__indirect(__element(j), bb), bb); }
+  }
+}
+
diff --git a/netty/server/src/main/java/com/miti99/netty/fbs/PacketData.java b/netty/server/src/main/java/com/miti99/netty/fbs/PacketData.java
new file mode 100644
index 0000000..8c3748a
--- /dev/null
+++ b/netty/server/src/main/java/com/miti99/netty/fbs/PacketData.java
@@ -0,0 +1,15 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+package com.miti99.netty.fbs;
+
+public final class PacketData {
+  private PacketData() { }
+  public static final byte NONE = 0;
+  public static final byte LoginRequest = 1;
+  public static final byte LoginResponse = 2;
+
+  public static final String[] names = { "NONE", "LoginRequest", "LoginResponse", };
+
+  public static String name(int e) { return names[e]; }
+}
+
diff --git a/netty/server/src/main/java/com/miti99/netty/fbs/Player.java b/netty/server/src/main/java/com/miti99/netty/fbs/Player.java
new file mode 100644
index 0000000..5011117
--- /dev/null
+++ b/netty/server/src/main/java/com/miti99/netty/fbs/Player.java
@@ -0,0 +1,45 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+package com.miti99.netty.fbs;
+
+import java.nio.*;
+import java.lang.*;
+import java.util.*;
+import com.google.flatbuffers.*;
+
+@SuppressWarnings("unused")
+public final class Player extends Table {
+  public static void ValidateVersion() { Constants.FLATBUFFERS_1_12_0(); }
+  public static Player getRootAsPlayer(ByteBuffer _bb) { return getRootAsPlayer(_bb, new Player()); }
+  public static Player getRootAsPlayer(ByteBuffer _bb, Player obj) { _bb.order(ByteOrder.LITTLE_ENDIAN); return (obj.__assign(_bb.getInt(_bb.position()) + _bb.position(), _bb)); }
+  public void __init(int _i, ByteBuffer _bb) { __reset(_i, _bb); }
+  public Player __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
+
+  public int userId() { int o = __offset(4); return o != 0 ? bb.getInt(o + bb_pos) : 0; }
+  public String userName() { int o = __offset(6); return o != 0 ? __string(o + bb_pos) : null; }
+  public ByteBuffer userNameAsByteBuffer() { return __vector_as_bytebuffer(6, 1); }
+  public ByteBuffer userNameInByteBuffer(ByteBuffer _bb) { return __vector_in_bytebuffer(_bb, 6, 1); }
+  public com.miti99.netty.fbs.Vec2 position() { return position(new com.miti99.netty.fbs.Vec2()); }
+  public com.miti99.netty.fbs.Vec2 position(com.miti99.netty.fbs.Vec2 obj) { int o = __offset(8); return o != 0 ? obj.__assign(o + bb_pos, bb) : null; }
+  public double rotation() { int o = __offset(10); return o != 0 ? bb.getDouble(o + bb_pos) : 0.0; }
+  public int team() { int o = __offset(12); return o != 0 ? bb.getInt(o + bb_pos) : 0; }
+
+  public static void startPlayer(FlatBufferBuilder builder) { builder.startTable(5); }
+  public static void addUserId(FlatBufferBuilder builder, int userId) { builder.addInt(0, userId, 0); }
+  public static void addUserName(FlatBufferBuilder builder, int userNameOffset) { builder.addOffset(1, userNameOffset, 0); }
+  public static void addPosition(FlatBufferBuilder builder, int positionOffset) { builder.addStruct(2, positionOffset, 0); }
+  public static void addRotation(FlatBufferBuilder builder, double rotation) { builder.addDouble(3, rotation, 0.0); }
+  public static void addTeam(FlatBufferBuilder builder, int team) { builder.addInt(4, team, 0); }
+  public static int endPlayer(FlatBufferBuilder builder) {
+    int o = builder.endTable();
+    return o;
+  }
+
+  public static final class Vector extends BaseVector {
+    public Vector __assign(int _vector, int _element_size, ByteBuffer _bb) { __reset(_vector, _element_size, _bb); return this; }
+
+    public Player get(int j) { return get(new Player(), j); }
+    public Player get(Player obj, int j) {  return obj.__assign(__indirect(__element(j), bb), bb); }
+  }
+}
+
diff --git a/netty/server/src/main/java/com/miti99/netty/fbs/Vec2.java b/netty/server/src/main/java/com/miti99/netty/fbs/Vec2.java
new file mode 100644
index 0000000..5796839
--- /dev/null
+++ b/netty/server/src/main/java/com/miti99/netty/fbs/Vec2.java
@@ -0,0 +1,32 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+package com.miti99.netty.fbs;
+
+import java.nio.*;
+import java.lang.*;
+import java.util.*;
+import com.google.flatbuffers.*;
+
+@SuppressWarnings("unused")
+public final class Vec2 extends Struct {
+  public void __init(int _i, ByteBuffer _bb) { __reset(_i, _bb); }
+  public Vec2 __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
+
+  public double x() { return bb.getDouble(bb_pos + 0); }
+  public double y() { return bb.getDouble(bb_pos + 8); }
+
+  public static int createVec2(FlatBufferBuilder builder, double x, double y) {
+    builder.prep(8, 16);
+    builder.putDouble(y);
+    builder.putDouble(x);
+    return builder.offset();
+  }
+
+  public static final class Vector extends BaseVector {
+    public Vector __assign(int _vector, int _element_size, ByteBuffer _bb) { __reset(_vector, _element_size, _bb); return this; }
+
+    public Vec2 get(int j) { return get(new Vec2(), j); }
+    public Vec2 get(Vec2 obj, int j) {  return obj.__assign(__element(j), bb); }
+  }
+}
+
diff --git a/netty/server/src/main/java/com/miti99/netty/json/BaseJsonPacket.java b/netty/server/src/main/java/com/miti99/netty/json/BaseJsonPacket.java
new file mode 100644
index 0000000..61da955
--- /dev/null
+++ b/netty/server/src/main/java/com/miti99/netty/json/BaseJsonPacket.java
@@ -0,0 +1,9 @@
+package com.miti99.netty.json;
+
+import lombok.Getter;
+
+@Getter
+public abstract class BaseJsonPacket {
+
+  private JsonPacketId id;
+}
diff --git a/netty/server/src/main/java/com/miti99/netty/json/JsonPacketId.java b/netty/server/src/main/java/com/miti99/netty/json/JsonPacketId.java
new file mode 100644
index 0000000..ac505d3
--- /dev/null
+++ b/netty/server/src/main/java/com/miti99/netty/json/JsonPacketId.java
@@ -0,0 +1,21 @@
+package com.miti99.netty.json;
+
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public enum JsonPacketId {
+  PING,
+  LOGIN,
+  PLAYER_MOVE,
+  PLAYER_ATTACK,
+  MATCH_INFO,
+  ;
+
+  public static JsonPacketId valueOf(int id) {
+    if (id < 0 || id >= values().length) {
+      log.error("No element matches {}", id);
+      throw new IllegalArgumentException("No element matches " + id);
+    }
+    return values()[id];
+  }
+}
diff --git a/netty/server/src/main/java/com/miti99/netty/json/JsonPacketIdDeserializer.java b/netty/server/src/main/java/com/miti99/netty/json/JsonPacketIdDeserializer.java
new file mode 100644
index 0000000..dec4e25
--- /dev/null
+++ b/netty/server/src/main/java/com/miti99/netty/json/JsonPacketIdDeserializer.java
@@ -0,0 +1,20 @@
+package com.miti99.netty.json;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParseException;
+import java.lang.reflect.Type;
+import lombok.Getter;
+
+public class JsonPacketIdDeserializer implements JsonDeserializer<JsonPacketId> {
+
+  @Getter private static final JsonPacketIdDeserializer instance = new JsonPacketIdDeserializer();
+
+  @Override
+  public JsonPacketId deserialize(
+      JsonElement jsonElement, Type type, JsonDeserializationContext jsonDeserializationContext)
+      throws JsonParseException {
+    return JsonPacketId.valueOf(jsonElement.getAsInt());
+  }
+}
diff --git a/netty/server/src/main/java/com/miti99/netty/json/request/BaseJsonRequest.java b/netty/server/src/main/java/com/miti99/netty/json/request/BaseJsonRequest.java
new file mode 100644
index 0000000..c3694df
--- /dev/null
+++ b/netty/server/src/main/java/com/miti99/netty/json/request/BaseJsonRequest.java
@@ -0,0 +1,19 @@
+package com.miti99.netty.json.request;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.miti99.netty.json.BaseJsonPacket;
+import com.miti99.netty.json.JsonPacketId;
+import com.miti99.netty.json.JsonPacketIdDeserializer;
+
+public abstract class BaseJsonRequest extends BaseJsonPacket {
+
+  private static final Gson gson =
+      new GsonBuilder()
+          .registerTypeAdapter(JsonPacketId.class, JsonPacketIdDeserializer.getInstance())
+          .create();
+
+  public static BaseJsonRequest fromJson(String data) {
+    return gson.fromJson(data, BaseJsonRequest.class);
+  }
+}
diff --git a/netty/server/src/main/java/com/miti99/netty/json/request/LoginJsonRequest.java b/netty/server/src/main/java/com/miti99/netty/json/request/LoginJsonRequest.java
new file mode 100644
index 0000000..1122838
--- /dev/null
+++ b/netty/server/src/main/java/com/miti99/netty/json/request/LoginJsonRequest.java
@@ -0,0 +1,9 @@
+package com.miti99.netty.json.request;
+
+import lombok.Getter;
+
+@Getter
+public class LoginJsonRequest extends BaseJsonRequest {
+
+  int userId;
+}
diff --git a/netty/server/src/main/java/com/miti99/netty/json/response/BaseJsonResponse.java b/netty/server/src/main/java/com/miti99/netty/json/response/BaseJsonResponse.java
new file mode 100644
index 0000000..f9c2066
--- /dev/null
+++ b/netty/server/src/main/java/com/miti99/netty/json/response/BaseJsonResponse.java
@@ -0,0 +1,12 @@
+package com.miti99.netty.json.response;
+
+import com.google.gson.Gson;
+
+public abstract class BaseJsonResponse {
+
+  private static final Gson gson = new Gson();
+
+  public String toJson() {
+    return gson.toJson(this);
+  }
+}
diff --git a/netty/server/src/main/java/com/miti99/netty/json/response/LoginJsonResponse.java b/netty/server/src/main/java/com/miti99/netty/json/response/LoginJsonResponse.java
new file mode 100644
index 0000000..b98133a
--- /dev/null
+++ b/netty/server/src/main/java/com/miti99/netty/json/response/LoginJsonResponse.java
@@ -0,0 +1,10 @@
+package com.miti99.netty.json.response;
+
+import lombok.AllArgsConstructor;
+
+@AllArgsConstructor
+public class LoginJsonResponse extends BaseJsonResponse {
+
+  int userId;
+  String userName;
+}
diff --git a/netty/server/src/main/resources/sample.fbs b/netty/server/src/main/resources/sample.fbs
deleted file mode 100644
index 5ec644e..0000000
--- a/netty/server/src/main/resources/sample.fbs
+++ /dev/null
@@ -1,33 +0,0 @@
-// Example IDL file for our monster's schema.
-
-namespace MyGame.Sample;
-
-enum Color:byte { Red = 0, Green, Blue = 2 }
-
-union Equipment { Weapon } // Optionally add more tables.
-
-struct Vec3 {
-  x:float;
-  y:float;
-  z:float;
-}
-
-table Monster {
-  pos:Vec3; // Struct.
-  mana:short = 150;
-  hp:short = 100;
-  name:string;
-  friendly:bool = false (deprecated);
-  inventory:[ubyte];  // Vector of scalars.
-  color:Color = Blue; // Enum.
-  weapons:[Weapon];   // Vector of tables.
-  equipped:Equipment; // Union.
-  path:[Vec3];        // Vector of structs.
-}
-
-table Weapon {
-  name:string;
-  damage:short;
-}
-
-root_type Monster;
diff --git a/netty/server/src/main/resources/schema.fbs b/netty/server/src/main/resources/schema.fbs
new file mode 100644
index 0000000..8caad7a
--- /dev/null
+++ b/netty/server/src/main/resources/schema.fbs
@@ -0,0 +1,33 @@
+namespace com.miti99.netty.fbs;
+
+struct Vec2 {
+  x: double;
+  y: double;
+}
+
+table Player {
+  userId: int;
+  userName: string;
+  position: Vec2;
+  rotation: double;
+  team: int;
+}
+
+table LoginRequest {
+  userId: int;
+}
+
+table LoginResponse {
+  player: Player;
+}
+
+union PacketData {
+  LoginRequest,
+  LoginResponse
+}
+
+table Packet {
+  data: PacketData;
+}
+
+root_type Packet;