I fixed it by myself.
Putting the following in EAR/META-INF/jboss-app.xml solved my problem.
<?xml version="1.0" encoding="UTF-8" ?>
<jboss-app>
<loader-repository>
swgcore:loader=EAR
<loader-repository-config>
java2ParentDelegation=false
</loader-repository-config>
</loader-repository>
</jboss-app>
The loader-repository-config solved it.
thx
regards