a4j:push broken on WebLogic 12c ------------------------------- Key: RF-13674 URL: https://issues.jboss.org/browse/RF-13674 Project: RichFaces Issue Type: Bug Security Level: Public(Everyone can see) Components: component-push/poll Affects Versions: 4.2.0.Final Environment: WebLogic 12c Reporter: Val Blant Attachments: atmosphere-weblogic12c-bug-0.8.4-sources.jar, atmosphere-weblogic12c-bug-0.8.4.war <a4j:push /> works properly on Tomcat 7, but fails on WebLogic 12c. {code:title=Page.xhtml|borderStyle=solid} <a4j:push address="systemLinks" > <a4j:ajax event="dataavailable" render="systemLinksPanel" /> </a4j:push> <a4j:outputPanel id="systemLinksPanel"> stuff here </a4j:outputPanel> {code} {code:title=Java Code} TopicKey topicKey = new TopicKey("systemLinks"); TopicsContext topicsContext = TopicsContext.lookup(); topicsContext.publish(topicKey, "fly, you fools!"); {code} On Tomcat 7 this work perfectly, and always refreshes '_systemLinksPanel_' when data is published. On Weblogic 12c the data is not flushed correctly. If you use Wireshark, you'd see the following response coming back from the server: {panel:title=Tomcat 7} 3b <"topic":"systemLinks","data":"fly, you fools!","number":0> 0 {panel} {panel:title=Weblogic 12c} 003b <"topic":"systemLinks","data":"fly, you fools!","number":0> {panel} *Note the missing zero terminator line in the WebLogic response!* I narrowed down the problem to the following: {code:title=org.richfaces.application.push.impl.RequestImpl} public synchronized void onBroadcast(AtmosphereResourceEvent<HttpServletRequest, HttpServletResponse> event) { MessageDataScriptString serializedMessages = (MessageDataScriptString) event.getMessage(); getSession().clearBroadcastedMessages(serializedMessages.getLastSequenceNumber()); hasActiveBroadcaster = false; if (isPolling()) { event.getResource().resume(); // <= THIS LINE } else { postMessages(); } } {code} There is nothing wrong with this in principle, but it does not work due to a bug in Atmosphere 0.8.4. Calling _AtmosphereResource.resume()_ at this point seems reasonable, since it is supposed to properly finish/commit the _HttpServletResponse_. However, this does not work on WebLogic 12c and leads to incorrectly flushed data demonstrated above. The underlying problem seems to be the fact that _AtmosphereResource.resume()_ method interrupts the thread which flushed the socket Writer before a call to _asyncContext.complete()_ is made: {code} public AtmosphereResource resume() { .... if (!b.isDestroyed()) { b.removeAtmosphereResource(event.getResource()); } .... asyncSupport.action(this); // <= This is where asyncContext.complete() is called } {code} I have verified that calling _asyncContext.complete()_ before we clean up Atmosphere resources fixes the problem. Here's the fix, which needs to go into _RequestImpl.onBroadcast_: {code:title=org.richfaces.application.push.impl.RequestImpl} public synchronized void onBroadcast(AtmosphereResourceEvent<HttpServletRequest, HttpServletResponse> event) { .............. if (isPolling()) { // This is the workaround. Completing AsyncContext before cleaning up Atmosphere resources // seems to make this work everywhere. // AsyncContext asyncContext = (AsyncContext) event .getResource() .getRequest() .getAttribute("org.atmosphere.container.asyncContext"); if ( asyncContext != null ) { asyncContext.complete(); } event.getResource().resume(); } else { postMessages(); } } .............. {code} I am attaching a very simple WAR file that demonstrates the problem clearly. The demo app does not use Richfaces, b/c I wanted to remove all unnecessary complexity. Instead I created a couple of simple classes that mimic the behavior of _org.richfaces.webapp.PushHandlerFilter_ and _org.richfaces.application.push.impl.RequestImpl_. In the demo app, _MeteorRequest = RequestImpl_, which is where the fix needs to go.