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Disable the appserver plug-in and open the project which is targeted to appserver.
Created attachment 33768 [details] NPE
F. Checking in src/org/netbeans/modules/j2ee/deployment/config/ConfigSupportImpl.java; /cvs/j2eeserver/src/org/netbeans/modules/j2ee/deployment/config/ConfigSupportImpl.java,v <-- ConfigSupportImpl.java new revision: 1.40.2.4.2.7; previous revision: 1.40.2.4.2.6 done