import org.joor.Reflect; Reflect reflect = Reflect.on("com.example.SomeClass"); SomeClass obj = reflect.create().get(); reflect.call("someMethod").get(); reflect.field("someField").set("value"); String value = reflect.field("someField").get(); import org.joor.Reflect; SomeInterface original = new SomeClass(); SomeInterface proxy = Reflect.on(original).as(SomeInterface.class); proxy.someMethod();