[fixes #2682] Fix NPE, always add Javadoc return statement

test/transform/resource/after-ecj/CheckerFrameworkBasic.java

@@ -6,6 +6,9 @@ import lombok.With;
   private final @With int x;
   private final int y;
   private int z;
+  /**
+   * @return {@code this}.
+   */
   public @org.checkerframework.dataflow.qual.SideEffectFree @java.lang.SuppressWarnings("all") CheckerFrameworkBasic withX(final int x) {
     return ((this.x == x) ? this : new CheckerFrameworkBasic(x, this.y, this.z));
   }
@@ -18,6 +21,9 @@ import lombok.With;
   public @org.checkerframework.dataflow.qual.SideEffectFree @java.lang.SuppressWarnings("all") int getZ() {
     return this.z;
   }
+  /**
+   * @return {@code this}.
+   */
   public @org.checkerframework.common.returnsreceiver.qual.This @java.lang.SuppressWarnings("all") CheckerFrameworkBasic setZ(final int z) {
     this.z = z;
     return this;