PI58029: Classloader leak associated with PCRegistry

Fixes are available

APAR status

Closed as program error.

Error description

Classloader was detected as leak associated with PCRegistry
object. This can be revealed when stopping application
and the following property is enabled.
  "com.ibm.ws.runtime.component.MemoryLeakConfig
  .detectAppCLLeaks=true"

Local fix

implement PCRegistery.deRegister() within
ServletContextListener's  'contextDestroyed' method.

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V8.5.0 and V8.5.5 who make use of    *
*                  OpenJPA.                                    *
****************************************************************
* PROBLEM DESCRIPTION: OpenJPA's PCRegistry class might        *
*                      cause a Classloader leak after an       *
*                      application restart.                    *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
When an application makes use of OpenJPA, that application can
be listed as being a leak suspect when the application is
restarted.  When looking at the leak suspect stack, the
PCEnhancer is listed as a suspect as follows:
82,585,680 (64.78%) [32] 101 class
org/apache/openjpa/enhance/PCEnhancer 0x3f76800
|- 82,582,296 (64.78%) [32] 26 class
org/apache/openjpa/enhance/Reflection 0x3f7db10
|- 82,571,808 (64.77%) [64] 2
org/apache/openjpa/lib/util/concurrent/ConcurrentReferenceHashMa
p 0x3bd7440
|- 82,571,720 (64.77%) [64] 2 array of
org/apache/openjpa/lib/util/concurrent/ConcurrentReferenceHashMa
p$Entry 0x3bd8988
|- 82,466,504 (64.69%) [48] 4
org/apache/openjpa/lib/util/concurrent/ConcurrentReferenceHashMa
p$WeakEntry 0x3bd9e30
|- 82,465,528 (64.69%) [32] 27 class example/Row
0x3f7ee60
|- 82,462,968 (64.69%) [152] 21
com/ibm/ws/classloader/CompoundClassLoader 0x4762208
|- 82,434,272 (64.66%) [48] 1
java/util/Hashtable 0x476cab0
|- 82,434,224 (64.66%) [64] 4 array of
java/util/Hashtable$Entry 0x477a2c0
|- 75,507,680 (59.23%) [24] 2
java/util/Hashtable$Entry 0x4ca4e48
|- 75,506,328 (59.23%) [32] 22
class example/MyServlet 0x2b27600
Notice that at the bottom of the stack is the class
'MyServlet'.  This is the application class which is making
use of JPA/OpenJPA.  This class is not doing anything improper
with OpenJPA, rather OpenJPA is not properly clearning up some
meta data, contained in OpenJPA's PCRegistry, associated with
MyServlet and its containing application.

Problem conclusion

With this fix, code has been added to OpenJPA to allow its
PCRegistry to remove meta data for an application which
has been stopped, thus allowing the associated Classloader to
be GC'd.

The fix for this APAR is currently targeted for
inclusion in Service Level (Fix Pack) 8.5.5.10 of WebSphere
Application Server version 8.5.5 and fix pack 16.0.0.2 of
WebSphere Liberty.
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
PI58029
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
2016-02-24
Closed date
2016-05-18
Last modified date
2016-06-09

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

PI78357 PI78486

Fix information

Fixed component name
WEBS APP SERV N
Fixed component ID
5724H8800

Applicable component levels

R850 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:
28 April 2022

Tips

PI58029: Classloader leak associated with PCRegistry

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

Document Information

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