EJB Deployed twice on the same JBoss AS configuration

[bgonline]

Hello,

I have an EJB with two different imlpementations but with the same ejb-name in the ejb-jar.xml file :

<ejb-name>ErrorMessageService</ejb-name>
<home>com.cwsoft.emmngt.service.interfaces.ErrorMessageServiceRemoteHome</home>
<remote>com.cwsoft.emmngt.service.interfaces.ErrorMessageServiceRemote</remote>
<local-home>com.cwsoft.emmngt.service.interfaces.ErrorMessageServiceLocalHome</local-home>
<local>com.cwsoft.emmngt.service.interfaces.ErrorMessageServiceLocal</local>
<ejb-class>com.cwsoft.emmngt.service.ejb.ErrorMessageServiceSession</ejb-class>

Just the jboss.xml file is different.
One has the following description :

<ejb-name>ErrorMessageService</ejb-name>
<jndi-name>ejb/com/cwsoft/emmngt/service/ErrorMessageServiceRemote</jndi-name>
<local-jndi-name>ejb/com/cwsoft/emmngt/service/ErrorMessageServiceLocal</local-jndi-name>

And the other has the follownig description :

<ejb-name>ErrorMessageService</ejb-name>
<jndi-name>ejb/com/cwsoft/emmngt/service/ErrorMessageServiceRemote2</jndi-name>
<local-jndi-name>ejb/com/cwsoft/emmngt/service/ErrorMessageServiceLocal2</local-jndi-name>

But when I call the same method of the two different implementations, I have always the result of the second implementation.
So, what have I got to do in order to solve this problem ?
Have I got to make modifications in the Class Loader ?

Thanks in advance for your help.
bgOnline

[bgonline]

Moreover, when I look in the JMX console, I see that both EJB have the same proxy number...

[bgonline]

I tried to set the attribute

<attribute name="Isolated">true</attribute>

...of the ear-deployer to true, but when I do that, I have the following error :

org.jboss.deployment.DeploymentException: Error during deploy; - nested throwable: (ReflectionException: Cannot find setter method setDocBase null Cause: java.lang.NoSuchMethodException: org.apache.commons.modeler.BaseModelMBean.setDocBase(java.lang.String))

Every help is WELCOME 8-))-
bgOnline