NPE related with GBeanInstance happened when excuting karaf features uninstall command
--------------------------------------------------------------------------------------

                 Key: GERONIMO-6279
                 URL: https://issues.apache.org/jira/browse/GERONIMO-6279
             Project: Geronimo
          Issue Type: Bug
      Security Level: public (Regular issues)
          Components: commands
    Affects Versions: 3.0-beta-1
         Environment: IBM J9 VM (build 2.4, JRE 1.6.0 IBM J9 2.4 Linux amd64-64 jvmxa6460sr10-20111207_96808 (JIT enabled, AOT enabled)
            Reporter: Tina Li
            Priority: Minor


1.Start the server using command: ./geronimo run
2.Execute the command: geronimo> features:list
3.Execute the command: geronimo>features:install obr successfully after fixed by geronimo-6278
4.Excute the command: geronimo>features:uninstall,although command executed successfully but error  appeared:
geronimo> features:uninstall  obr
2012-02-17 21:06:44,088 ERROR [GBeanInstance] Problem in doStop of org.apache.geronimo.framework/j2ee-system/3.0-beta-2-SNAPSHOT/car?ServiceModule=org.apache.geronimo.framework/j2ee-system/3.0-beta-2-SNAPSHOT/car,j2eeType=GBean,name=GeronimoOBR
java.lang.NullPointerException: A null service reference is not allowed.
	at org.eclipse.osgi.framework.internal.core.BundleContextImpl.getService(BundleContextImpl.java:586)
	at org.apache.geronimo.obr.GeronimoOBRGBean.unregisterRepositories(GeronimoOBRGBean.java:228)
	at org.apache.geronimo.obr.GeronimoOBRGBean.doStop(GeronimoOBRGBean.java:245)
	at org.apache.geronimo.gbean.runtime.GBeanInstance.destroyInstance(GBeanInstance.java:1191)
	at org.apache.geronimo.gbean.runtime.GBeanInstanceState.attemptFullStop(GBeanInstanceState.java:346)
	at org.apache.geronimo.gbean.runtime.GBeanInstanceState.stop(GBeanInstanceState.java:191)
	at org.apache.geronimo.gbean.runtime.GBeanInstance.stop(GBeanInstance.java:577)
	at org.apache.geronimo.kernel.basic.BasicKernel.stopGBean(BasicKernel.java:430)
	at org.apache.geronimo.gbean.runtime.GBeanInstanceState.stop(GBeanInstanceState.java:183)
	at org.apache.geronimo.gbean.runtime.GBeanInstance.stop(GBeanInstance.java:577)
	at org.apache.geronimo.kernel.basic.BasicKernel.stopGBean(BasicKernel.java:430)
	at org.apache.geronimo.kernel.config.KernelConfigurationManager$ShutdownHook.run(KernelConfigurationManager.java:381)
	at org.apache.geronimo.kernel.basic.BasicKernel.notifyShutdownHooks(BasicKernel.java:671)
	at org.apache.geronimo.kernel.basic.BasicKernel.shutdown(BasicKernel.java:648)
	at org.apache.geronimo.system.osgi.BootActivator.stop(BootActivator.java:92)
	at org.eclipse.osgi.framework.internal.core.BundleContextImpl$2.run(BundleContextImpl.java:771)
	at java.security.AccessController.doPrivileged(AccessController.java:251)
	at org.eclipse.osgi.framework.internal.core.BundleContextImpl.stop(BundleContextImpl.java:764)
	at org.eclipse.osgi.framework.internal.core.BundleHost.stopWorker(BundleHost.java:510)
	at org.eclipse.osgi.framework.internal.core.AbstractBundle.suspend(AbstractBundle.java:565)
	at org.eclipse.osgi.framework.internal.core.Framework.suspendBundle(Framework.java:1161)
	at org.eclipse.osgi.framework.internal.core.PackageAdminImpl.suspendBundle(PackageAdminImpl.java:327)
	at org.eclipse.osgi.framework.internal.core.PackageAdminImpl.processDelta(PackageAdminImpl.java:468)
	at org.eclipse.osgi.framework.internal.core.PackageAdminImpl.doResolveBundles(PackageAdminImpl.java:253)
	at org.eclipse.osgi.framework.internal.core.PackageAdminImpl$1.run(PackageAdminImpl.java:173)
	at java.lang.Thread.run(Thread.java:736)



--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira