Finally, I found it !
It is an ugly maven dependency for jbpm-api to jboss-j2ee !
I don't know if it's really used but excuding it solve my reloading issue !
<dependency>
<groupId>org.jbpm.jbpm4</groupId>
<artifactId>jbpm-api</artifactId>
<version>4.3</version>
<exclusions>
<exclusion>
<artifactId>jboss-j2ee</artifactId>
<groupId>jboss</groupId>
</exclusion>
</exclusions>
</dependency>
Regards