Jboss 5 - InstanceAlreadyExistsException - already registere

[wasu]

I am using JBoss 5.1.0 and EJB 3.0. Before I used JBoss 4.2.2 where the following error did not happen.

I am using a base.jar which contains reusable code (Stateless and Entity Beans). So I include the base.jar in some other application-jar-archives:

The base-app.jar and the base-session-app.jar include the base.jar and have both the following structure, the deployment descriptors however are different:
/META-INF
/META-INF/ejb-jar.xml
/META-INF/orm.xml
/META-INF/persistence.xml
/base.jar

First I deploy the base-app.jar. When I then deploy the base-session-app.jar, I get the following deployment error:

ERROR [EJBModule] Could not create JSR-77 EJBModule: base.jar
javax.management.InstanceAlreadyExistsException: jboss.management.local:j2eeType=EJBModule,J2EEServer=Local,J2EEApplication=null,name=base.jar already registered.

However after this error I can access the stateless session beans of both deployments, of base-app.jar and of base-session-app.jar.

I deploy only statless session beans and entity beans. I have no @Stateless, no @Remote and no @Entity annotations in the source code, I am using the deployment descriptors so that I can load exaclty those EJBs what I want.

The ejb-jar.xml in base-app.jar/META-INF is:

<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd"
version="3.0">
<enterprise-beans>
<session>
 <ejb-name>UserEntityHandler</ejb-name>
 <business-remote>pte.base.users.user.IUserEntityHandlerRemote</business-emote>
 <ejb-class>pte.base.baseasc.users.user.UserEntityHandler</ejb-class>
 <session-type>Stateless</session-type>
</session>
...
</enterprise-beans>

The ejb-jar.xml in base-session-app.jar/META-INF/ is:

<ejb-jar
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd"
version="3.0">
<enterprise-beans>
<session>
 <ejb-name>WebSessionClientHandler</ejb-name>
 <business-remote>pte.base.sessions.IWebSessionClientHandlerRemote</business-remote>
 <ejb-class>pte.base.baseasc.sessions.WebSessionClientHandler</ejb-class>
 <session-type>Stateless</session-type>
</session>
</enterprise-beans>

I have found some similar problems in this forum with the comment that in JBoss 5 this should be solved. Sorry if this issue has often been discussed before, but I did not found an answer concerning JBoss5.

Does anyone have an idea why this error happens?
Is this really an error (as I said, I can access the beans of both deployments)?

[jaikiran]

The base-app.jar and the base-session-app.jar include the base.jar

You have a jar within another jar?

[wasu]

Yes. The base.jar has reusable code. That's why I use the base.jar in many different other application-jars (e.g. base-app.jar and base-session-app.jar).

I also develop the base.jar, so the base.jar is very often overworked. That's why I do not put the base.jar in the lib directory of the JBoss server (because as far as I know I have to restart the server when a jar in the lib directory is changed). That's why I put the base.jar into the other application-jars (e.g. base-app.jar, base-session-app.jar) so that I can deploy changes in base.jar by deploying the application-jar without restarting the server.

At JBoss 4 this worked fine. However in JBoss 5 I get the described error.