mailto:kabir.khan@jboss.com wrote:     3) When accessing generics from the return type of a method, e.g.        Collection<String> getStringCollection(){} we get hold of this method using normal reflection (A) and construct the TypeInfo for that using the ParameterizedType (B1+2) for which I extended the Javassist TypeInfo factory:    *private* *void* assertComponentType(String methodName, Class<?> expected) *throws* Exception    {       Method method = ClassInfoGenericClassTest.class.getMethod(methodName, (Class[]) *null*); //A       Type type = method.getGenericReturnType(); //B1       assertComponentType(type, expected);    }    *private* *void* assertComponentType(Type type, Class<?> expected) *throws* Exception    {       TypeInfoFactory factory = getTypeInfoFactory();       TypeInfo typeInfo = factory.getTypeInfo(type); //B2       ClassInfo classInfo = assertInstanceOf(typeInfo, ClassInfo.class);       assertTrue(classInfo.isCollection());       TypeInfo expectedInfo = factory.getTypeInfo(expected);       assertEquals(expectedInfo, classInfo.getComponentType());    } However, that is probably not what will happen in real life, we would have a ClassInfo, get hold of the MethodInfo in question, and then get the return type which should contain the actualTypeArguments. This needs implementing and is not being tested at the moment, and the same goes for parameters and field types.