client.addListener(callbackHandler, new InvokerLocator(callbackLocatorURI));
log.info("client added callback handler");
client.invoke(CALLBACK_TEST);
assertEquals(1, callbackHandler.callbackCounter);
SocketServerInvoker invoker = (SocketServerInvoker) connector.getServerInvoker();
Field field = SocketServerInvoker.class.getDeclaredField("clientpool");
field.setAccessible(true);
LRUPool clientpool = (LRUPool) field.get(invoker);
Set threads = clientpool.getContents();
for (Iterator it = threads.iterator(); it.hasNext(); )