Weblogic server is not starting up ; error is unable to get file lock

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If the weblogic server is not starting up and giving the below error , please follow the below solution :-

Error :-

Aug 15, 2014 12:53:34 AM PDT   Info   WebLogicServer   BEA-000377 Starting WebLogic Server with Oracle JRockit(R) Version R28.2.7-7-155314-1.6.0_45-20130329-0641-linux-x86_64 from Oracle Corporation 
Aug 15, 2014 12:53:45 AM PDT   Info Management BEA-141281 unable to get file lock, will retry ...

Aug 15, 2014 12:56:37 AM PDT Info Management BEA-141281 unable to get file lock, will retry ...
Aug 15, 2014 12:56:40 AM PDT Critical WebLogicServer BEA-000362 Server failed. Reason:

There are 1 nested errors:

weblogic.management.ManagementException: Unable to obtain lock on /u01/app/oracle/config/domains/Vinay/servers/AdminServer/tmp/AdminServer.lok. Server may already be running
                at weblogic.management.internal.ServerLocks.getServerLock(ServerLocks.java:206)
                at weblogic.management.internal.ServerLocks.getServerLock(ServerLocks.java:67)
                at weblogic.management.internal.DomainDirectoryService.start(DomainDirectoryService.java:74)
                at weblogic.t3.srvr.ServerServicesManager.startService(ServerServicesManager.java:461)
                at weblogic.t3.srvr.ServerServicesManager.startInStandbyState(ServerServicesManager.java:166)
                at weblogic.t3.srvr.T3Srvr.initializeStandby(T3Srvr.java:882)
                at weblogic.t3.srvr.T3Srvr.startup(T3Srvr.java:572)
                at weblogic.t3.srvr.T3Srvr.run(T3Srvr.java:469)
                at weblogic.Server.main(Server.java:71)

Aug 15, 2014 12:56:40 AM PDT Notice WebLogicServer BEA-000365 Server state changed to FAILED>
Aug 15, 2014 12:56:40 AM PDT Error WebLogicServer BEA-000383 A critical service failed. The server will shut itself down
Aug 15, 2014 12:56:40 AM PDT Notice WebLogicServer BEA-000365 Server state changed to FORCE_SHUTTING_DOWN


Solution 1) remove .lok files and try restart
2) check ps –eaf|grep oracle if there are other startweblogic.sh command is executed . if yes, kill it
3) if still not start , mount nfs with nolock option enabled
4) Check /etc/hosts file , if the ip & hostname is correct.

5) if still not start , reboot the server.

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