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

test/transform/resource/after-delombok/JacksonizedSuperBuilderSimple.java

@@ -11,6 +11,9 @@ public class JacksonizedSuperBuilderSimple {
 			protected abstract B self();
 			@java.lang.SuppressWarnings("all")
 			public abstract C build();
+			/**
+			 * @return {@code this}.
+			 */
 			@java.lang.SuppressWarnings("all")
 			public B field1(final int field1) {
 				this.field1 = field1;