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

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

@@ -7,9 +7,15 @@ class WithPlain {
     this.i = i;
     this.foo = foo;
   }
+  /**
+   * @return a clone of this object, except with this updated property (returns {@code this} if an identical value is passed).
+   */
   public @org.springframework.lang.NonNull @java.lang.SuppressWarnings("all") WithPlain withI(final int i) {
     return ((this.i == i) ? this : new WithPlain(i, this.foo));
   }
+  /**
+   * @return a clone of this object, except with this updated property (returns {@code this} if an identical value is passed).
+   */
   public @org.springframework.lang.NonNull @java.lang.SuppressWarnings("all") WithPlain withFoo(final int foo) {
     return ((this.foo == foo) ? this : new WithPlain(this.i, foo));
   }