subsystem failed. Reason: java.lang.NullPointerException

Was unable to start the managed server due to the following exception.
 I noticed the Perm space was almostfull.

I just killed the java process, restarted the Admin and managed server both and it resolved the issue.
ps -ef | grep java
kill -9 6682
<Feb 28, 2012 5:07:15 PM GMT> <Critical> <WebLogicServer> <BEA-000386> <Server subsystem failed. Reason: java.lang.NullPointerException
java.lang.NullPointerException
        at weblogic.store.io.file.StoreFile.close(StoreFile.java:440)
        at weblogic.store.io.file.Heap.open(Heap.java:320)
        at weblogic.store.io.file.FileStoreIO.open(FileStoreIO.java:104)
        at weblogic.store.internal.PersistentStoreImpl.recoverStoreConnections(PersistentStoreImpl.java:431)
        at weblogic.store.internal.PersistentStoreImpl.open(PersistentStoreImpl.java:422)
        Truncated. see log file for complete stacktrace
>
<Feb 28, 2012 5:07:15 PM GMT> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to FAILED>
<Feb 28, 2012 5:07:15 PM GMT> <Error> <WebLogicServer> <BEA-000383> <A critical service failed. The server will shut itself down>
<Feb 28, 2012 5:07:15 PM GMT> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to FORCE_SHUTTING_DOWN>

 PSYoungGen      total 172032K, used 153481K [0x00000000f4000000, 0x0000000100000000, 0x0000000100000000)
  eden space 147456K, 87% used [0x00000000f4000000,0x00000000fbde26d0,0x00000000fd000000)
  from space 24576K, 100% used [0x00000000fd000000,0x00000000fe800000,0x00000000fe800000)
  to   space 24576K, 0% used [0x00000000fe800000,0x00000000fe800000,0x0000000100000000)
 PSOldGen        total 65536K, used 4288K [0x00000000e0000000, 0x00000000e4000000, 0x00000000f4000000)
  object space 65536K, 6% used [0x00000000e0000000,0x00000000e0430010,0x00000000e4000000)
 PSPermGen       total 118784K, used 118201K [0x00000000d0000000, 0x00000000d7400000, 0x00000000e0000000)
  object space 118784K, 99% used [0x00000000d0000000,0x00000000d736e600,0x00000000d7400000)