PK75950: INTERMITTENTLY A SERVANT WILL STOP SERVICING REQUESTS ON A RECYCLE WITH CONTROL_REGION_DREG_ON_NO_SRS=1 SET.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Intermittently a servant may become unresponsive to requests
  after a recycle (due to abend or cancel) when the server is
  configured with control_region_dreg_on_no_srs=1.  This is a
  timing problem, and will no always occur.  Servants experiencing
  this problem will fail to receive a j2ee.state.running
  notification and will not put out a CWWIM6002I message.  The
  following exception may also be seen:
  .
  error propagating notifs to servant <servant ID>;
  com.ibm.websphere.management.exception.ConnectorException:
   Local exception
    at
  com.ibm.ws390.management.connector.corba.CorbaConnectorClient.in
  voke(CorbaConnectorClient.java:859)
    at
  com.ibm.ws390.management.InterProcessAdminService.invoke(InterPr
  ocessAdminService.java:352)
    at
  com.ibm.ws390.management.proxy.ServerMBeanProxy.sendRunningNotif
  ication(ServerMBeanProxy.java:778)
    at
  com.ibm.ws390.management.proxy.ServerMBeanProxy.synchronizeThrea
  dMonitor(ServerMBeanProxy.java:675)
    at
  com.ibm.ws390.management.proxy.ServerMBeanProxy.handleInternalNo
  tification(ServerMBeanProxy.java:649)
    at
    at
  com.ibm.ws390.management.ProxyMBeanSupport.handleNotification(Pr
  oxyMBeanSupport.java:333)
    at
  com.ibm.ws.management.ControlAdminServiceImpl.startupServantJVM(
  ControlAdminServiceImpl.java:1384)
    at
  com.ibm.ws.management._ControlAdminServiceImpl_Tie.startupServan
  tJVM(_ControlAdminServiceImpl_Tie.java:184)
    at
  com.ibm.ws.management._ControlAdminServiceImpl_Tie._invoke(_Cont
  rolAdminServiceImpl_Tie.java:83)
  ...
  Caused by: org.omg.CORBA.INTERNAL:   vmcid: 0xc9c21000  minor
  code: 99  completed: No
    at java.lang.Class.newInstanceImpl(Native Method)
    at java.lang.Class.newInstance(Class.java:1300)
    at
  com.ibm.rmi.util.Utility.readSystemException(Utility.java:2013)
  ...
  This APAR will also resolve a NullPointerException directly
  associated with this problem:
  .
  java.lang.NullPointerException
   at com.ibm.ws390.orb.SRAggregator.hasNext(Unknown Source)
   at
  com.ibm.ws390.management.connector.corba.CorbaConnectorClient.re
  connect(CorbaConnectorClient.java:280)
  ...
  

Local fix

• To ensure you avoid the issue entirely, remove the
  control_region_dreg_on_no_srs environment variable, or code it
  to 0 (which is the default).  Since this is a timing problem,
  the issue may not be seen on all installations, however.  If you
  experience the servant hang, a recycle of the server will be
  required.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere Application Server    *
  *                 V7.0 for z/OS                                *
  ****************************************************************
  * PROBLEM DESCRIPTION: A servant may become unresponsive to    *
  *                      requests after a recycle when the       *
  *                      server is configured with               *
  *                      control_region_dreg_on_no_srs=1.        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The function related to the control_region_dreg_on_no_srs
  setting causes the shutdown of listeners and the rejecting of
  requests by the Server until the minimum number of "Ready"
  servants has been restarted.  A timing window exists that may
  cause an internal request to fail during initialization. This
  request failure during initialization may lead to the servants
  failure to process new requests.
  
  The NullPointerException in SRAggregator was caused by a
  missing check in the hasNext method.
  

Problem conclusion

• Code has been added to synchronize the servant startup code
  with the restarting of the listeners and allowing new requests
  to be processed.
  
  SRAggregator code has been updated to eliminate the
  NullPointerException in the hasNext method.
  
  APAR PK75950 is currently targeted for inclusion in Service
  Level (Fix Pack) 7.0.0.1 of WebSphere Application Server V7.0
  for z/OS.
  
  Please refer to URL:
  //www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
  for Fix Pack availability.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  PK69971

• APAR is sysrouted TO one or more of the following:

Modules/Macros

• BBGUBINF BBOUBINF
  

Fix information

• Fixed component name

  WEBSPHERE FOR Z

• Fixed component ID

  5655I3500

Applicable component levels

• R700 PSY UK41764

     UP08/12/05 P F812

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.