Map metadata = new HashMap();
metadata.put(ServerInvoker.BLOCKING_MODE, ServerInvoker.NONBLOCKING);
metadata.put(CallbackPoller.CALLBACK_POLL_PERIOD, "500");
metadata.put(ServerInvoker.BLOCKING_TIMEOUT, "500");
metadata.put(CallbackPoller.MAX_ERROR_COUNT, "4");
client.addListener(callbackHandler, metadata);
log.info("client added callback handler for pull callbacks");
// Test for good connection.
assertEquals("abc", client.invoke("abc"));