PI74952: CLASSLOADER LEAK CAUSED BY EJB TIMER THREAD

Fixes are available

APAR status

Closed as program error.

Error description

The classloader leak is caused by the
"WebSphere_EJB_Timer_Service_WorkManager Thread ".
The reference of EJB_Timer thread to CompoundClassLoader
remained, so classloader leak might occur.

com.ibm.ws.classloader.CompoundClassLoader @ 0x7010d8a10
   war:test-1_0-SNAPSHOT-DF01_war/test-1.0-SNAPSHOT-DF01.war
'- moduleClassLoader
com.ibm.ws.webbeans.services.ScannerServiceImpl @0x71cb48a50
   '- scannerService
org.apache.webbeans.container.BeanManagerImpl @0x726ddf8e0
      '- beanMgrImpl
com.ibm.ws.webbeans.services.IBMBeanManagerImpl @0x711403410
         '- value
java.util.concurrent.ConcurrentHashMap$HashEntry @0x70110a8c0
            '- [0]
java.util.concurrent.ConcurrentHashMap$HashEntry[1] @0x70c53c1d0
               '- table
java.util.concurrent.ConcurrentHashMap$Segment @0x70c53bfa0
                  '- [13]
java.util.concurrent.ConcurrentHashMap$Segment[16] @ 0x70c53bf18
                     '- segments
java.util.concurrent.ConcurrentHashMap@ 0x70c4ce340
                        '- cache
my.test.class$BeanManagerCache @0x70c4c1bb0
                           '- INSTANCE class
my.test.class$BeanManagerCache @0x700b6b018
                              '-
com.ibm.ws.classloader.CompoundClassLoader @ 0x700d7ee68

   war:test-1_0-SNAPSHOT-DF01_war/test-1.0-SNAPSHOT-DF01.war
                                 |- contextClassLoader
com.ibm.ws.asynchbeans.am.AlarmManagerThread @ 0x710739108

   WebSphere_EJB_Timer_Service_WorkManager:AlarmManager Thread
                                 |- contextClassLoader
java.lang.Thread@ 0x710739190  Alarms per second thread for

   WebSphere_EJB_Timer_Service_WorkManager Thread
                                 |- <classloader>,
<classLoader> class
my.test.second.class2 @ 0x700acc720
                                 |  '- <class>
my.test.second.class2 @ 0x70c95d110
                                 |     '- value
java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0x70c969f78
                                 |        '- [237]
java.lang.ThreadLocal$ThreadLocalMap$Entry[256] @ 0x70c5a02d0
                                 |           '- table
java.lang.ThreadLocal$ThreadLocalMap @ 0x700e170c0
                                 |              '- threadLocals
com.ibm.ws.util.ThreadPool$Worker @ 0x700e14508  server.startup
: 1Thread

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server                                      *
****************************************************************
* PROBLEM DESCRIPTION: Class loader leak when scheduled        *
*                      task/timer is read from the database    *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
Application class loader can be left on the thread that
deserializes a scheduled tasks or timer from the database.
This can prevent garbage collection of application classes
once they are no longer needed, for example, because the
application is stopped or restarted.

Problem conclusion

Code has been corrected to remove the application class loader
from the thread.

The fix for this APAR is currently targeted for inclusion in
fix packs 8.5.5.12 and 9.0.0.4.  Please refer to the
Recommended Updates page for delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Temporary fix

Comments

APAR Information

APAR number
PI74952
Reported component name
WEBS APP SERV N
Reported component ID
5724H8800
Reported release
850
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2017-01-13
Closed date
2017-04-12
Last modified date
2017-04-12

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
WEBS APP SERV N
Fixed component ID
5724H8800

Applicable component levels

R850 PSY
UP
R900 PSY
UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.5","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
04 May 2022

Tips

PI74952: CLASSLOADER LEAK CAUSED BY EJB TIMER THREAD

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

R850 PSY

R900 PSY

Document Information

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