PI18259: OUT OF MEMORY ERROR FOR MATCH PATTERN WITH MANY STEPS AND PREDICATES

Fixes are available

APAR status

Closed as program error.

Error description

An OutOfMemoryError occurs when compiling XSL stylsheets with
a template match pattern that contains many steps and
predicates.

Local fix

```
text fix was provided and verified
```

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V8.0 and V8.5 compiling XSL          *
*                  stylsheets with template match patterns     *
****************************************************************
* PROBLEM DESCRIPTION: OutOfMemoryError when compiling XSL     *
*                      stylsheets with template match pattern  *
*                      that contains many steps and            *
*                      predicates                              *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
A large amount of memory was consumed when compiling template
match patterns with lots of steps and predicates.
For example:
<xsl:template match="*[local-name()='AAA']/*[local-
name()='BBB']/*[local-name()='CCC']/*
[local-name()='DDD']/*[local-name()='EEE']/*[local-
name()='FFF']/*[local-name()='GGG']/*
[local-name()='HHH']/*[local-name()='III']">
A n! algorithm was used to rewrite the predicates. This was the
root cause for the high memory usage. As the number of
predicates and steps increased, the memory usage also
increased, eventually causing the OutOfMemoryError.

Problem conclusion

The n! algorithm was replaced by a much simpler but more
efficient algorithm. The memory usage is decreased and the
OutOfMemoryError is avoided.

The fix for this APAR is currently targeted for inclusion in
fix packs 8.0.0.10 and 8.5.5.3.  Please refer to the
Recommended Updates page for delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Temporary fix

Rewriting the match pattern (if possible) to avoid using
predicates works around the problem. The above match
pattern could be re-written as:

<xsl:template
match="*:AAA/*:BBB/*:CCC/*:DDD/*:EEE/*:FFF/*:GGG/*:HHH/*:III">

Comments

APAR Information

APAR number
PI18259
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
2014-05-20
Closed date
2014-07-10
Last modified date
2014-07-10

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

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:
27 April 2022

Tips

PI18259: OUT OF MEMORY ERROR FOR MATCH PATTERN WITH MANY STEPS AND PREDICATES

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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