[fixes #2168] Added JsonSetter as a copyable annotation

test/stubs/com/fasterxml/jackson/annotation/JsonSetter.java

@@ -0,0 +1,12 @@
+package com.fasterxml.jackson.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({ElementType.ANNOTATION_TYPE, ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER})
+@Retention(RetentionPolicy.RUNTIME)
+public @interface JsonSetter {
+	Nulls nulls();
+}