PM64489: ENTITYMANAGERFACTORIES CAN BE LEAKED IF THEY ARE CREATED WITH THE JSE BOOTSTRAP PERSISTENCE CLASS AND ARE NEVER CLOSED

Fixes are available

APAR status

Closed as program error.

Error description

EntityManagerFactories can be leaked if they are created with
the JSE bootstrap Persistence class and are never closed,
causing an OutOfMemoryException.

Local fix

This is a known behavior as documented by OPENJPA-2042, where
the solution was to modify the list of listeners to use a
weak-reference HashSet. This has been implemented in OpenJPA
2.2.x

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V7.0 and V8.0                        *
****************************************************************
* PROBLEM DESCRIPTION: WebSphere heap exhaustion occurs, and   *
*                      PCRegistry shows as one of the largest  *
*                      retained heap consumers.                *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
Whenever an OpenJPA EntityManagerFactory is created, a
reference to its internal metadata is retained by PCRegistry's
listener list.  The entry from the listener list is removed
only when an EMF is properly closed (by invoking its close()
method).  This does not automatically occur if an unclosed EMF
is garbage collected (that is , all references to it are set
to null.)
Because the application server is responsible for managing
resources injected by @PersistenceUnit, this problem only
occurs when the application uses
javax.persistence.Persistence.createEntityManagerFactory() to
acquire instances of EntityManagerFactory.  The lifecycle of
EntityManagerFactory instances obtained this way, from
beginning to end, are the responsibility of the application.
Applications that do not invoke the close() method on the
EntityManagerFactory before allowing it to be garbage collected
are prone to this leak.

Problem conclusion

The list retained by PCRegistry has been updated to retain a
weak reference to the internal data structures.  This prevents
the memory leak from occurring.

The fix for this APAR is currently targeted for inclusion in
fix packs 7.0.0.25 and 8.0.0.5.  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
PM64489
Reported component name
WEBS APP SERV N
Reported component ID
5724H8800
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2012-05-11
Closed date
2012-08-20
Last modified date
2012-10-11

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

PM64591

Fix information

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

Applicable component levels

R700 PSY
UP
R800 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":"7.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
28 October 2021

Tips

PM64489: ENTITYMANAGERFACTORIES CAN BE LEAKED IF THEY ARE CREATED WITH THE JSE BOOTSTRAP PERSISTENCE CLASS AND ARE NEVER CLOSED

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

R700 PSY

R800 PSY

Document Information

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