PM23875: JAVA.LANG.NULLPOINTEREXCEPTION AT JAVA.UTIL.HASHTABLE.GET(HASHTABLE.JAVA:460)

Fixes are available

APAR status

Closed as program error.

Error description

A WebSphere for z/OS Controller Region suffers performance
degradation over several hours.
GC cycles take longer and longer.
Eventually the JVM hits OOM in the Java Heap with hundreds of
these objects:
"com.ibm.ISecurityLocalObjectCSIv2UtilityImpl.SessionManager"

Just prior to the leak becoming visible, the controller region
cut an FFDC record:

Exception = java.lang.NullPointerException
Source = com.ibm.ejs.util.am._Alarm.run
probeid = 95
Stack Dump = java.lang.NullPointerException
 at java.util.Hashtable.get(Hashtable.java:460)
 at com.ibm.ISecurityLocalObjectCSIv2UtilityImpl.
     SessionManager.clean_session_tables(
     SessionManager.java:1525)
 at com.ibm.ISecurityLocalObjectCSIv2UtilityImpl.
     SessionManager.alarm(SessionManager.java:1648)
 at com.ibm.ejs.util.am._Alarm.run(_Alarm.java:90)
 at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1497)

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V6.1.0                               *
****************************************************************
* PROBLEM DESCRIPTION: During CSIv2 cached session cleanup,    *
*                      WebSphere Application Server threw      *
*                      this exception to FFDC:                 *
*                                                              *
*                      Exception =                             *
*                      java.lang.NullPointerException          *
*                      Source = com.ibm.ejs.util.am._Alarm.run *
*                      probeid = 95                            *
*                      Stack Dump =                            *
*                      java.lang.NullPointerException          *
*                      at                                      *
*                      java.util.Hashtable.get(Hashtable.java: *
*                      460)                                    *
*                      at                                      *
*                      com.ibm.ISecurityLocalObjectCSIv2Utilit *
*                      yImpl.                                  *
*                      SessionManager.clean_session_tables(    *
*                      SessionManager.java:1525)               *
*                      at                                      *
*                      com.ibm.ISecurityLocalObjectCSIv2Utilit *
*                      yImpl.                                  *
*                      SessionManager.alarm(SessionManager.jav *
*                      a:1648)                                 *
*                      at                                      *
*                      com.ibm.ejs.util.am._Alarm.run(_Alarm.j *
*                      ava:90)                                 *
*                      at                                      *
*                      com.ibm.ws.util.ThreadPool$Worker.run(T *
*                      hreadPool.java:1497)                    *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
WebSphere Application Server was not properly checking the key
of the hashtable for null before making an attempt to retrieve
the value for said key.

Problem conclusion

WebSphere Application Server has been modified to correctly
check for null in this case.

APAR PM23875 is currently targeted for inclusion in
Service Level (Fix Pack) 6.1.0.37 of WebSphere
Application Server V6.1

Please refer to URL:
//www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
for Fix Pack availability.

Temporary fix

Comments

APAR Information

APAR number
PM23875
Reported component name
WEBSPHERE FOR Z
Reported component ID
5655I3500
Reported release
610
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2010-10-05
Closed date
2010-12-20
Last modified date
2011-05-02

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

PM37634

Fix information

Fixed component name
WEBSPHERE FOR Z
Fixed component ID
5655I3500

Applicable component levels

R610 PSY UK65883
UP11/04/06 P F104

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.

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SS7K4U","label":"WebSphere Application Server for z\/OS"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"6.1","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
24 October 2021

Tips

PM23875: JAVA.LANG.NULLPOINTEREXCEPTION AT JAVA.UTIL.HASHTABLE.GET(HASHTABLE.JAVA:460)

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name

Fixed component ID

Applicable component levels

R610 PSY UK65883

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.

Document Information

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