Info about SimpleSingletonElectionPolicy

[leonets]

Hi all,

I have a problem using the SingletonElectionPolicy.

First, I tried to modify the hasingleton service for including it in my application where I added the following dependencies.

I moved the java files and renamed the package, I moved the meta-inf directory and updated the package inside the file org.jboss.msc.service.ServiceActivator.

The 'example' has been moved inside an 'EJBModule' in an Enterprise application.

org.jboss.msc, jboss-msc, 1.2.6.Final, provided

org.jboss.spec.javax.ejb,jboss-ejb-api_3.1_spec,1.0.2.Final-redhat-3,provided

org.jboss.spec.javax.annotation, jboss-annotations-api_1.1_spec,1.0.1.Final-redhat-3,provided

org.jboss.as,jboss-as-clustering-singleton,7.5.0.Final-redhat-21,provided

org.jboss.as, jboss-as-logging,7.5.0.Final-redhat-21

If I set 'provided' I get a LinkageError

Caused by: java.lang.LinkageError: loader constraint violation:

when resolving method "org.jboss.as.clustering.singleton.SingletonService.<init>

(Lorg/jboss/msc/service/Service;Lorg/jboss/msc/service/ServiceName;)V"

the class loader (instance of org/jboss/modules/ModuleClassLoader) of the current class,

it/example/cluster/timer/HATimerServiceActivator,

and the class loader (instance of org/jboss/modules/ModuleClassLoader) for resolved class,

org/jboss/as/clustering/singleton/SingletonService,

have different Class objects for the type org/jboss/msc/service/Service used in the signature

While if I DO NOT set 'provided' I instead get a ClassNotFound

Caused by: java.lang.ClassNotFoundException: org.jboss.as.clustering.singleton.SingletonElectionPolicy from [Module "

I am using EAP 6.4, any idea ?

the jboss-as-clustering-singleton artifact ishould be provided or not ?

thks in advance

I answer by myself ... You need to add the modules to the jboss-deployment.xml          <module name="org.jboss.as.clustering.service" export="true" />          <module name="org.jboss.as.clustering.singleton" export="true" />          <module name="org.jboss.msc" export="true" />

[wdfink]

I don't have a clear understanding right now, but it seems like a packaging issue.

Did you package any *jboss* class in your ear/jar, sometimes maven do this by accident.

Do you have a small example to share?

As you use EAP I suppose you have a subscription, in that case you might open a case in the portal.

[leonets]

Yes it is a packaging problem.

I resolved the ClassNotFound by adding all the needed modules to the jboss-deployment-structure.xml         

<module name="org.jboss.as.clustering.service" export="true" />         

<module name="org.jboss.as.clustering.singleton" export="true" />         

<module name="org.jboss.msc" export="true" />

[wdfink]

You should mark the answer as "correct", makes it easier for others