Request for integrating #235858 - Deadlock on opening projects

Bug link:
http://netbeans.org/bugzilla/show_bug.cgi?id=235858

Description of the bug:
Random deadlock when opening Java EE Maven projects.

Impact assessment:
It might impact on anyone whose using Java EE Maven projects.

Risk assessment:
IMHO there should be no risk.

Fix:
http://hg.netbeans.org/main-golden/rev/a8e9b9407478


The fix was written by Martin Janicek, reviewed by Milos Kleint and 
verifed by Stepan Zebra.

Thanks for the review,
Martin J.