[jboss-user] [JBossCache] - PojoCache ClassCastException
If this is a stupid question (ie the answer is to be found in the docs, examples, this
forum, or the wiki) please tell me, and I will go back searching. Otherwise I would be
very greatful if someone with experience of PojoCache anf JBoss classloading could give me
their view.
I hava a PojoCache deployed on the JBoss As Server (4.0.5). I create and update objects
from a Servlet. This works fine until I undeploy and deploy the Web App. I then get a
ClassCastException here:
| Object obj = cache.getObject("/totos/" + nick);
| Toto toto = (toast.Toto) obj;
|
(The object concerned is a 'Toto')
I have "UseJBossWebLoader" in the Tomcat jboss-service.xml set to true.
(Otherwise the cache in the 'other' server of the cluster can not find the
object).
I have traced the classloaders being used. With the following code:
| Object obj = cache.getObject("/totos/" + nick);
| ...
| System.out.println("Object retrieved from cache class is: " +
obj.getClass().getName() + ", Classloader is:" +
obj.getClass().getClassLoader());
| System.out.println("Context Classloader is:" +
Thread.currentThread().getContextClassLoader());
| System.out.println("Class loader of a new class is:" + new
Toto().getClass().getClassLoader());
| Toto toto = (toast.Toto) obj;
|
This gives:
| Object retrieved from cache class is: toast.Toto, Classloader
is:org.jboss.mx.loading.UnifiedClassLoader3@9c67db{ url=null ,addedOrder=57}
| Context Classloader is:org.jboss.web.tomcat.tc5.WebCtxLoader$ENCLoader@feb215
| Class loader of a new class is:org.jboss.mx.loading.UnifiedClassLoader3@bf4472{
url=file:/C:/jboss/jboss-4.0.5.GAejb3/server/default/tmp/deploy/tmp60992simple-exp.war/
,addedOrder=58}
|
So the classloader used to load the object from the cache (UCL, addorder=57) is not the
same as that used to create an object in this environment (UCL, addorder=58). So I can
understand that I get a ClasscastException.
I have tried registering the classloader used by the servlet:
| MBeanServer server = MBeanServerLocator.locateJBoss();
| cache = (PojoCacheMBean) MBeanProxyExt.create(PojoCacheMBean.class,
"jboss.cache:service=PojoCache", server);
| ClassLoader cl = new Toto().getClass().getClassLoader();
| cache.registerClassLoader("/totos", cl);
|
But this has had no effect.
I have also tried setting the ContextClassLoader to the ClassLoader used by the cache:
| ClassLoader cl = obj.getClass().getClassLoader();
| Thread.currentThread().setContextClassLoader(cl);
|
But that had no effect either.
Thank you.
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