https://issues.jboss.org/browse/WFLY-1969

You may want as next to try in modules/org/picketlink/main/module.xml

...
<module name="org.apache.santuario.xmlsec">
   <imports>
      <exclude path="javax/*"/>
         </imports>
</module>
...

instead of

...
<module name="org.apache.santuario.xmlsec"/>
...

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