The delegating invoker fails for indirect recursive calls as they might easily occur in a CoR pattern. Test case: public static interface Faculty { int calc(int i, Faculty fac); }; public void testShouldSupportIndirectRecursion() { Faculty fac = new Faculty() { public int calc(int i, Faculty fac) { return i == 1 ? 1 : i * fac.calc(i-1, fac); } }; Faculty proxy = (Faculty)Delegating.object(Faculty.class, fac, getFactory()); assertEquals(120, fac.calc(5, fac)); assertEquals(120, proxy.calc(5, proxy)); } Issue is related to PTOYS-5