Startup error for EAP6.4 deployable - Provider com.sun.script.javascript.RhinoScriptEngineFactory not found

I spot an error in startup log when deloy brms 6.4 DR1[1] into EAP 6.4.8[2].
(This also happens to BPMSuite as well if I deploy the bpmsuite war files)
Business-central log in ok and no problem found. But it is expected that no error should be found in startup log.
Startup log has been attached
[1]:http://rcm-guest.app.eng.bos.redhat.com/rcm-guest/staging/jboss-brms/BRMS-6.4.0.DR1/jboss-brms-6.4.0.DR1-deployable-eap6.x.zip
[2]:http://download.eng.pnq.redhat.com/released/JBEAP-6/

11:21:22,220 ERROR [stderr] (MSC service thread 1-2) ScriptEngineManager providers.next(): javax.script.ScriptEngineFactory: Provider com.sun.script.javascript.RhinoScriptEngineFactory not found