Re: [jboss-dev] generic collection item type

Yes, it does work! Thanks! I had to add a check that the interface implements the reference before calling locateActualType because in case of Comparable<T> and so on I would get NPE later. I checked out the trunk but it didn't build. So, here is the diff. Type[] interfaces = clazz.getGenericInterfaces(); for (Type intf : interfaces) - { - Type result; + { + Class interfaceClass; if (intf instanceof Class) { - Class interfaceClass = (Class) intf; - result = locateActualType(reference, parameter, interfaceClass, intf); - if (result instanceof TypeVariable) - result = getParameter(clazz, type, (TypeVariable) result); + interfaceClass = (Class) intf; } else if (intf instanceof ParameterizedType) { ParameterizedType interfaceType = (ParameterizedType) intf; - Class interfaceClass = (Class) interfaceType.getRawType(); + interfaceClass = (Class) interfaceType.getRawType(); + } + else + throw new IllegalStateException("Unexpected type " + intf.getClass()); + + Type result = null; + if (reference.isAssignableFrom(interfaceClass)) + { result = locateActualType(reference, parameter, interfaceClass, intf); if (result instanceof TypeVariable) result = getParameter(clazz, type, (TypeVariable) result); } - else - throw new IllegalStateException("Unexpected type " + intf.getClass()); + if (result != null) return result; Adrian wrote: