OK ignore my previous post as I obviously didn't understand how mbeans work.
This is the code that I believe takes the approach Adrian suggested. I have
made it detailed for Adrian to check the approach is valid and so anyone else
following in my footsteps doesn't have to trawl through the doco like I did.
JmsClassPreloader.java
| package com.acme.server.plugin.mbean;
|
| import org.apache.log4j.Logger;
| import org.jboss.system.ServiceMBeanSupport;
|
| public class JmsClassPreloader extends ServiceMBeanSupport implements
JmsClassPreloaderMBean {
| private static final Logger logger =
Logger.getLogger(JmsClassPreloader.class);
|
| public void start() throws Exception {
| try {
| if (logger.isDebugEnabled()) {
| logger.debug("starting JmsClassPreloader mbean
service");
| }
| // get the classloader associated with the thread
| ClassLoader cl =
Thread.currentThread().getContextClassLoader();
| // load the class
| cl.loadClass("org.jboss.mq.selectors.Operator");
| cl.loadClass("org.jboss.mq.selectors.Token");
| //etc for every possible class that jboss mq uses!
| } catch (Exception ex) {
| logger.warn("Exception in class preloader", ex);
| }
| }
| }
|
JmsClassPreloaderMBean.java
| package com.acme.server.plugin.mbean;
|
| import org.jboss.system.ServiceMBean;
|
| public interface JmsClassPreloaderMBean extends ServiceMBean {
|
| }
|
Then I create the following directory structure in my jboss server/deploy
directory
[acme-com-mbeans.sar]
----acme-mbeans.jar
----[META-INF]
--------jboss-service.xml
Where acme-mbeans.jar file is a jar containing the above two java class files
and jboss-service.xml contains the following
| <?xml version="1.0" encoding="UTF-8"?>
| <!DOCTYPE server>
| <!-- $Id$ -->
|
| <server>
|
| <mbean code="com.acme.server.plugin.mbean.JmsClassPreloader"
| name="acme.com:service=JmsClassPreloader">
| </mbean>
|
| </server>
|
Questions
Is this what you had in mind Adrian? Considering how many classes are in the
jboss mq jar file I dont think this is going to be practical since I have to
list every single class in the jar in the mbean start method for it to be
loaded (probably 50 or more). Is there a way of just loading a whole jar?
If not maybe I should instead create an MBean that presubscribes to one of the
topics instead to achieve the same classloading effect. But then am i
guaranteed my MBean will execute after the mbeans in the deploy/jms directory
that initialise the topics?
I await your response in hope,
Gray.
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