Java 11 migrate remaining p (#1122)

* Moves partial-response to Java 11

* Moves pipeline to Java 11

* Moves poison-pill to Java 11

* Moves priority-queue to Java 11

* Moves private-class-data to Java 11

* Moves producer-consumer to Java 11

* Moves promise to Java 11

* Moves property to Java 11

* Moves prototype to Java 11

* Moves proxy to Java 11

* Corrects checkstyle errors

* Fixes build for pipeline pattern

partial-response/src/test/java/com/iluwatar/partialresponse/FieldJsonMapperTest.java

@@ -23,11 +23,11 @@
 
 package com.iluwatar.partialresponse;
 
+import static org.junit.Assert.assertEquals;
+
 import org.junit.Before;
 import org.junit.Test;
 
-import static org.junit.Assert.assertEquals;
-
 /**
  * tests {@link FieldJsonMapper}.
  */
@@ -41,12 +41,15 @@ public class FieldJsonMapperTest {
 
   @Test
   public void shouldReturnJsonForSpecifiedFieldsInVideo() throws Exception {
-    String[] fields = new String[]{"id", "title", "length"};
-    Video video = new Video(2, "Godzilla Resurgence", 120, "Action & drama movie|", "Hideaki Anno", "Japanese");
+    var fields = new String[]{"id", "title", "length"};
+    var video = new Video(
+        2, "Godzilla Resurgence", 120,
+        "Action & drama movie|", "Hideaki Anno", "Japanese"
+    );
 
-    String jsonFieldResponse = mapper.toJson(video, fields);
+    var jsonFieldResponse = mapper.toJson(video, fields);
 
-    String expectedDetails = "{\"id\": 2,\"title\": \"Godzilla Resurgence\",\"length\": 120}";
+    var expectedDetails = "{\"id\": 2,\"title\": \"Godzilla Resurgence\",\"length\": 120}";
     assertEquals(expectedDetails, jsonFieldResponse);
   }
 }