PM42465: Excessive memory usage by XMLStreamReader pool may lead to OutOfMemoryError.

Fixes are available

APAR status

Closed as program error.

Error description

Excessive memory usage by the IBM StAX implementation may
result in a java.lang.OutOfMemoryError. The size of the
cached XMLStreamReader objects may grow without bound. Here is
a sample heapdump that was collected during a stress test:

1,934,853,366 (94%) [80] 4 array of
[Lcom/ibm/xml/xlxp2/api/util/Pool$Poolable; 0xfffffffeb1dfa6d8
 531,437,140 (25%) [796] 50
com/ibm/xml/xlxp2/api/wssec/WSSXMLStreamReader
0xfffffffeb1e56ae8
 512,072,055 (24%) [796] 47
com/ibm/xml/xlxp2/api/wssec/WSSXMLStreamReader
0xfffffffeb1dfa740
 474,720,178 (23%) [796] 50
com/ibm/xml/xlxp2/api/wssec/WSSXMLStreamReader
0xfffffffeb1e217d8
 416,623,913 (20%) [796] 51
com/ibm/xml/xlxp2/api/wssec/WSSXMLStreamReader
0xffffffff115d78e0

Local fix

```
na
```

Problem summary

****************************************************************
* USERS AFFECTED:  All IBM WebSphere Application Server V7.0   *
*                  and V8.0 users of StAX, JAXB and JAX-WS.    *
****************************************************************
* PROBLEM DESCRIPTION: Excessive memory usage by the IBM       *
*                      StAX implementation may lead to an      *
*                      OutOfMemoryError.                       *
****************************************************************
* RECOMMENDATION:  Install a fix pack that contains this       *
*                  APAR.                                       *
****************************************************************
When running a JAX-WS application, a tremendous growth in
the size of cached XMLStreamReader objects in the heap may be
observed.
A heapdump collected from a stress test may look like the
following:
1,934,853,366 (94%) [80] 4 array of
[Lcom/ibm/xml/xlxp2/api/util/Pool$Poolable; 0xfffffffeb1dfa6d8
531,437,140 (25%) [796] 50
com/ibm/xml/xlxp2/api/wssec/WSSXMLStreamReader
0xfffffffeb1e56ae8
512,072,055 (24%) [796] 47
com/ibm/xml/xlxp2/api/wssec/WSSXMLStreamReader
0xfffffffeb1dfa740
474,720,178 (23%) [796] 50
com/ibm/xml/xlxp2/api/wssec/WSSXMLStreamReader
0xfffffffeb1e217d8
416,623,913 (20%) [796] 51
com/ibm/xml/xlxp2/api/wssec/WSSXMLStreamReader
0xffffffff115d78e0

Problem conclusion

For efficiency the IBM StAX implementation caches
XMLStreamReader objects in a pool for reuse. This pool may
retain strong references to XMLStreamReaders which continue to
grow over time, eventually resulting in an OutOfMemoryError if
an excessive amount of memory is used by those objects.

A system property called
com.ibm.xml.xlxp2.api.util.Pool.STRONG_REFERENCE_POOL_MAXIMUM_SI
ZE is provided by this APAR. Its value is an integer and when
set, it limits the number of XMLStreamReaders (and
XMLStreamWriters) that will be cached using strong references.

To avoid the OutOfMemoryError, set the system property to 0.
This will force all XMLStreamReaders to be cached using
SoftReferences, allowing the garbage collector to reclaim the
memory they occupy in the cache at any time.

When the system property is not set its default value is 10.

The fix for this APAR is currently targeted for inclusion in
fix pack 7.0.0.21 and 8.0.0.2. 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
PM42465
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
2011-06-27
Closed date
2011-09-14
Last modified date
2011-09-14

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
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:
27 October 2021

Tips

PM42465: Excessive memory usage by XMLStreamReader pool may lead to OutOfMemoryError.

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

Share your feedback

Need support?