PM84305: OUTOFMEMORYERROR CAUSED BY MEMORY LEAK IN CACHING THE WRAPPER FOR URIS

Fixes are available

APAR status

Closed as program error.

Error description

Caching the wrapper for the URI is a performance enhancement.
It will save the server from repeatedly process and create the
necessary resources when serving the same request/URI several
times.
However, when an application creates unique requests for the
same static content, excess memory may be consumed.

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  IBM WebSphere Application Server version    *
*                  8.0 and 8.5                                 *
****************************************************************
* PROBLEM DESCRIPTION: An OutOfMemoryError (OOM) can occur     *
*                      when requesting static content.         *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
Under a very specific design, an application can cause the
server to run out of memory when serving a lot of unique
static content. The heapdump shows a large amount of memory is
held by:
com.ibm.ws.webcontainer.webapp.WebAppImpl
com.ibm.wsspi.webcontainer.util.URIMapper
com.ibm.wsspi.webcontainer.util.URIMatcher
com.ibm.ws.util.ClauseNode
com.ibm.ws.util.ClauseTable
The memory is occupied by the caching of the static content.
This is mainly for performance reason. When an application is
designed such that every request for the same static content
is unique, it consumes more memory to cache the requests.

Problem conclusion

The WebContainer code was modified to accommodate those
special applications by disabling static caching.

A new WebContainer customer property needs to be set to enable
the behavior provided by this APAR:

com.ibm.ws.webcontainer.disableStaticMappingCache

The following value can be specified for this property:

    * - disable static caching for all deployed applications

    A comma delimited list of specific applications that will
have the disable static caching

The following examples illustrate how to specify these two
settings:

com.ibm.ws.webcontainer.disableStaticMappingCache=*

com.ibm.ws.webcontainer.disableStaticMappingCache=SpecialApp,Rar
eApp

Please refer to the following technote for instructions on
enabling WebContainer custom properties:
http://www.ibm.com/support/docview.wss?rss=180&uid=swg21284395

Alternatively, a context parameter can be set in the web.xml
to disable static caching for the application.

<context-param>
  <param-name>
com.ibm.ws.webcontainer.DISABLE_STATIC_MAPPING_CACHE</param-name
>
  <param-value>true</param-value>
</context-param>

The fix for this APAR is currently targeted for inclusion in
fix packs 7.0.0.33, 8.0.0.7 and  8.5.5.1. 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
PM84305
Reported component name
WEBS APP SERV N
Reported component ID
5724H8800
Reported release
800
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2013-03-07
Closed date
2013-04-29
Last modified date
2013-12-04

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

PM91196

Fix information

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

Applicable component levels

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

Document Information

Modified date:
12 January 2022

Tips

PM84305: OUTOFMEMORYERROR CAUSED BY MEMORY LEAK IN CACHING THE WRAPPER FOR URIS

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

R800 PSY

R850 PSY

Document Information

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