this is already tracked in https://issues.jboss.org/browse/SHRINKRES-42 and will be fixed in 2.0.0-alpha-7, that goes out soonish. No backport is planned. Please update your pom.xml in order to use 2.0.0 stream instead.
You can follow this tutorial: https://community.jboss.org/wiki/HowToIAddMavenArtifactsToMyShrinkWrapArchives
Thanks very much for you help.
I'm sorry I had searched for similar issues in SHRINWRAP JIRA but I did not see there was also a SHRINKRES JIRA.
I guess the issue I logged should be considered duplicate: https://issues.jboss.org/browse/SHRINKWRAP-439