PM12460: HIGH MEMORY USE WHEN ANNOTATIONS ARE USED IN RELATION TO AN ARRAY TYPE.

Fixes are available

APAR status

Closed as program error.

Error description

Extra memory utilization will be seen when annotations are used
in relation to an Array type.  A static reference is created to
a J2EE module, and will create a long duration, large,
allocation.
A large static allocation held by ArrayClassInfo

Local fix

```
N/A
```

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server who use JavaEE5 enabled              *
*                  applications with annotations.              *
****************************************************************
* PROBLEM DESCRIPTION: Extra memory utilization will be seen   *
*                      when annotations are used               *
*                      in relation to an Array type.           *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
Extra memory utilization may be seen when java class
information is processed for annotation scanning steps, which
are performed when loading application and module metadata for
JavaEE5 enabled applications and application modules.

Extra allocations occur because of a static cache holding a
reference to class information for java.lang.Object.  The
reference holds a secondary reference to an application
module.  That causes the first module that was processed for
annotations to be held by reference and to prevent that first
module from being reclaimed by java garbage collection,
even after the application module goes out of use.

The effect is to hold the data for single application in
memory.  The actual impact depends on the size of the first
module to be processed.  For small modules, the impact is
relatively small (up to several megabytes of unreclaimed
allocations).  For very typical application modules, the
impact can be much larger.  When this problem was detected, a
memory allocation of slightly more than 60 megabytes was noted.

Problem conclusion

A code update was made to remove the static reference to class
information for java.lang.Object.

The fix for this APAR is currently targeted for inclusion in
fix pack 7.0.0.13.  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
PM12460
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
2010-04-16
Closed date
2010-05-25
Last modified date
2010-05-25

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

R700 PSY
UP

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"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:
25 October 2021

Tips

PM12460: HIGH MEMORY USE WHEN ANNOTATIONS ARE USED IN RELATION TO AN ARRAY TYPE.

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

Document Information

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