Why the AppModuleImpl can not implement MessageListener?
With the help of JDev 12.1.2.0.0.
I tried like crazy market to get some kind of asynchronous updates to work with ADF and it becomes the best of me. My past attempts have been arguing JMS in the image.
Of a bean to support, I invoke a method AppModuleImpl. This method adds a ticket # & status in a transient view object and then calls a Message Driven Bean. This bean gets the message with ticket # and starting to do some work. During this process, the message bean sends status updates via the 'back' queue, attaching the ticket # in the process. The AppModuleImpl class implements MessageListener, connects with this queue 'back', and calls its onMessage method. This, in theory, would allow me to update the view transition with a new status, automatically updated my page jspx object in the process.
It does not work. On the integration of the program I get this...
Received message back! <Apr 3, 2014 12:36:00 PM EDT> <Error> <JMSClientExceptions> <BEA-055165> <The following exception has occurred: java.lang.NullPointerException. java.lang.NullPointerException at com.stockaid.model.service.AppModuleImpl.onMessage(AppModuleImpl.java:91) at weblogic.jms.client.JMSSession.onMessage(JMSSession.java:4855) at weblogic.jms.client.JMSSession.execute(JMSSession.java:4529) at weblogic.jms.client.JMSSession.executeMessage(JMSSession.java:3976) at weblogic.jms.client.JMSSession.access$000(JMSSession.java:120) Truncated. see log file for complete stacktrace > Received message back! ... and on and on and on and on .... it loops.
I also tried this approach with a bean of support view extended with particularly strange results (Messaging - JSF Backing Bean boots Variable flow Capacitor and goes back in time... time... time - Stack Overflow).
How the world can implement some sort of asynchronous update with ADF Essentials? Is it still possible without question? I do not think that an asynchronous web service would work as reminders trigger only when the operation is complete (correct?). Ideas?
Here is the AppModuleImpl class for reference
public class AppModuleImpl extends ApplicationModuleImpl implements AppModule, MessageListener { /** * This is the default constructor (do not remove). */ public final static String JMS_FACTORY = "jms/TestConnectionFactory"; private static final String RETURN_QUEUE = "jms/TestJMSReturnQueue"; private static final String QUEUE = "jms/TestJMSQueue"; private QueueConnectionFactory qconFactory; private QueueConnection qcon; private QueueSession qsession; private QueueReceiver qreceiver; private QueueSender qsender; private Queue queueReturn; private Queue queue; private boolean isConnected; public AppModuleImpl() { isConnected = false; try { InitialContext ctx = new InitialContext(); qconFactory = (QueueConnectionFactory) ctx.lookup(JMS_FACTORY); qcon = qconFactory.createQueueConnection(); qsession = qcon.createQueueSession(false, Session.AUTO_ACKNOWLEDGE); queueReturn = (Queue) ctx.lookup(RETURN_QUEUE); qreceiver = qsession.createReceiver(queueReturn); qreceiver.setMessageListener(this); queue = (Queue) ctx.lookup(QUEUE); qsender = qsession.createSender(queue); qcon.start(); isConnected = true; } catch (JMSException e) { e.printStackTrace(); } catch (NamingException e) { e.printStackTrace(); } } @Override public void onMessage(Message msg) { System.out.println("Received message back!"); try { Long ticket = msg.getLongProperty("ticket"); String status = msg.getStringProperty("status"); Key key = new Key(new Object[] { ticket }); Row[] rows = this.getAllTickets().findByKey(key, 1); if (rows.length > 0) { rows[0].setAttribute("status", status); } } catch (JMSException e) { e.printStackTrace(); } } public void addTicket(long ticket, String status) { ViewObjectImpl allTickets = this.getAllTickets(); NameValuePairs nvp = new NameValuePairs(); nvp.setAttribute("TicketId", ticket); nvp.setAttribute("status", status); Row row = allTickets.createAndInitRow(nvp); allTickets.insertRow(row); try { MapMessage mapMessage = qsession.createMapMessage(); mapMessage.setLongProperty("ticket", ticket); System.out.println(" Sending: " + ticket); mapMessage.setStringProperty("value", status); qsender.send(mapMessage); } catch (JMSException e) { e.printStackTrace(); } catch (Throwable te) { te.printStackTrace(); } } public void updateStatus(long ticket, String status) { Key key = new Key(new Object[] { ticket }); Row[] rows = this.getAllTickets().findByKey(key, 1); if (rows.length > 0) { rows[0].setAttribute("status", status); } }
How I finally reached updates to asynchronous UI with WebSockets and JMS
Tags: Java
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