In Jboss4, I used to have an MDB listening to deployment messages for dynamically registering components in a system. I used the approach described at http://community.jboss.org/wiki/ExampleMinimalNotificationListener.
Apparently, this mechanism doesn't help anymore in JBoss 6.
So how can I get notified after an EJB has been deployed or before it gets undeployed?
Related
So we need to provision (add the jms extension/subsystem/configurations to standalone.xml) the JMS subsystem in wildfly when starting the server if it's not already provisioned and that needs to happen automatically. We have an application written in java and we chose to provision the jms subsystem with wildfly's cli java api and that is executed when our application starts deploying. The thing is we need to provision the jms subsystem and use it in the same application.
Problem is, when we add the needed configurations in standalone.xml with wildfly's cli java api, the server requires a reload but we can't reload it because our app is already deploying, it tries to use the defined queues and fails because... Well, the subsystem is not active yet. On next server restart everything is ok but as you can guess in a production environment this is unacceptable. Is there any solution to this? I've tried adding a reload cli command in the end of the batch that creates the jms subsystem and it starts reloading the server but the deployment doesn't stop and exceptions start flying left and right.
Also the whole idea of reloading the server from the app while the app is deploying seems kinda wrong to me.
Thanks in advance.
Solution:
Well the solution in the end was an easy one, we just had to add a reload step in the batch operation that adds the jms subsystem. The problem was that we had a set of async operation that all fired off when the app was deployed so i just had to make sure none of them started until i can check for the messaging subsystem and reload wildfly if necessary. That way I'm not interrupting any async tasks forcefully.
You need to select appropriate profile i.e full or full-ha while starting server only. If you do this there will not be need to add JMS subsystem.
If you want to go with your approach only, add dependency of queue in
application. It will not start deploying until and unless queue is bound to server.
we need to perform reload operation when we add new subsystem, if you dont want to perform reload operation then I will suggest you to start server in 'admin-only' mode. When we start server in 'admin-only' mode then it open only management port(9990/9999). Configure messaging subsystem through CLI command reload server instance. Hope it helps..!!
I am new to JMS and WAS. I am grateful if someone provides any reference that helps me to create a web application in eclipse with JMS and WAS 7.0.
Also want to get answers for below questions..
How to inject ConnectionFactory or Destination object (created in WAS) into application using jndi?
How to install and run JMS web application on WAS server?
First you need to decide on the provider for JMS. It could be WebSphere MQ, the JMS provider that comes inbuilt with WAS or some other provider too.
Refer to the redbooks https://www.redbooks.ibm.com/Redbooks.nsf/RedbookAbstracts/sg247770.html?Open.
You can use InitialContext to lookup connection factory and Destination.
You can deploy the JMS app just like any other app. But ensure that JNDI objects are configured.
This is also a nice info-center to use for reference: http://pic.dhe.ibm.com/infocenter/prodconn/v1r0m0/topic/com.ibm.scenarios.wmqwasusing.doc/topics/scenario_overview.htm
I am using Jboss5.1 and I have a EAR1 deployed which has a EJB3 component implemented using #Stateless annotation and the same EJB is also exposed as webservice using the annotation #webservice.
I want to check through a EJB service/management service bean(Packaged in another EAR2) from the start of deployment to un-deployment of EAR1 PERIODICALLY, if the EJB and Webservice is deployed and running properly and working normally and is not in deadlock/non responsive state.
I have looked into JMX and I am able to get notifications of create and destroy for EJB as well as webservice, but how to check periodically whether the EJB and webservice is working normally and is not in deadlock/non responsive state?
Also how to monitor Jboss ESB services?
Is the JMX is the only way or does jboss provides any other API's to do monitoring how about JBOSS MONITORING
Thanks in advance if you are looking at this.
Especially JBoss AS5.x is using the so called profile service (PS) as the main way to interact with the server. Unfortunately the PS is not JMX-based and on the other side you don't see all EJBs in the Platform MBean server.
RHQ has a plugin to monitor EJB instances inside AS5 as well as for other resource types like JBoss ESB or Apache Tomcat and is able to determine the availability of EJBs.
but how to check periodically whether the EJB and webservice is
working normally and is not in deadlock/non responsive state?
This is usually something that you can (only)(*) determine by hitting the relevant beans/methods and evaluating the outcome.
*) It may be possible to determine a bean in a deadlocked state by requesting a heap dump and looking for deadlocked periodically.
We are currently using JMS queue in Weblogic.
Can we use same JMS queue in Websphere as part of weblogic to websphere migration.
Is there any other concept available in websphere which can replace JMS queue?
WebSphere Application Server has a built-in JMS provider, due to the Java EE standard which defines it as mandatory (as Arjan Tijms already stated).
Setting up the JMS provider requires a so called Service Integration Bus, which is a simple Messaging Bus inside WebSphere. The Service Integration Bus also allows to setup High Available JMS queues/topics when using WebSphere Application Server Network Deployment.
Using this queues/topics outside of a WebSphere context - by putting messages into the queues from external clients or reading them from external clients - is hard.
Mainly due to the WebSphere internal CORBA communication it is quite tricky to setup a working and stable
configuration - and you need to know some internal WebSphere tricks.
My recommandation is to use internal jms configuration only for applications which are deployed on the same WebSphere Application Server-Configuration.
If you really need external access to the JMS queues/topics, you should write a adapter to access it.
This blog post describes in detail how to setup a simple WebSphere internal JMS configuration.
WebSphere has indeed an internal JMS provider. It's accessed using the SIB (Service Integration Bus). See http://www.packtpub.com/article/messaging-with-websphere-application-server-7.0-part1
WepSphere has JMS queues as well. Are you wanting to have the queue running within WebSphere, or are you trying to point to a queue running elsewhere?
Yes, you can.
Configuration depends on your JMS System.
If your JMS Middleware is running external like ApacheMQ or Swift JMS, you can normally install an Resource Adapter and then use that specific configuration (at least for the Jms configuration). Then you can use Websphere's JMS Configuration (like Queues and Topics) and therefor your normal MDB configuration.
Besides ActivationSpec (like above) at least with Websphere MQ you could use Listener Ports. I don't know if Listener Ports are available for other JMS Products.
If you want to use a built in Messaging System, you can use SIB I guess.
So plenty of options depending on your System.
A JMS provider is mandated by the Java EE specs so every application server has an inbuilt JMS Provider.
You have to make the right calls about your application needs. There might be valid reasons to use an external JMS provider such as WebSphere MQ.
Is there a single listener one could implement to get a "war deployed" event?
I know there is the ContextServletListener.
But it has to be 'attached' for each component (several web.xml files).
As a fallback, if I use ContextServletListener, how can I tell that the last component has been deployed?
As a side note: I need to be aware of a hot deploy when it finishes.
JBoss registers a J2EEApplication MBean when a war is deployed. You can register a JMX notification listener with the JBoss MBeanServer's MBeanServer delegate (Object name: JMImplementation:type=MBeanServerDelegate) which will notify you when MBeans are registered and unregistered.
An ObjectName filter like jboss.management.local:J2EEServer=Local,j2eeType=WebModule,* for your registered notification listener will get you notifications for all deployed wars.
This will work for JBoss 4.x and 5.x.