如何轻松地将Java图形序列化为JSON？

I am struggling to find a library that will serialise a simple graph of Java objects to/from JSON (no need for circular refs or anything). I don't want to have Java class names in the output but including an extra "@type": "foo" property is fine. It must work with untyped collections and maps. I expect to have to do something like mapper.registerType(MyClass.class, "foo") to specify the type mappings but the library must take it from there. Anyone know of such a thing?I am struggling to find a library that will ser