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the issue seems to be caused due to missing synchronization
Created attachment 31884 [details] stack trace
F. Checking in src/org/netbeans/modules/j2ee/deployment/impl/ServerInstance.java; /cvs/j2eeserver/src/org/netbeans/modules/j2ee/deployment/impl/ServerInstance.java,v <-- ServerInstance.java new revision: 1.61.2.4.2.11; previous revision: 1.61.2.4.2.10 done