PM90581: SERVER STARTUP REGRESSION (3%) FOR AN ANNOTATIONS ENABLED APPLIC ATION.

Fixes are available

APAR status

Closed as program error.

Error description

Server startup is regressed by 3% for an annotations enabled
application.

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V8.0 and V8.5                        *
****************************************************************
* PROBLEM DESCRIPTION: Application startup is delayed by up    *
*                      to 3% for applications which contain    *
*                      annotations enabled metadata.           *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
A change in class loading, which was introduced by the upgrade
of the Java Development Kit (JDK), caused a regression of
startup for annotations enabled applications of approximately
3%.
The regression is caused by changes to class loading order.
The JDK upgrade was from a base level of
pap6460_26sr3-20120810_01(SR3) to an updated level of
pap6460_26sr5ifix-20130301_01(SR5+IV36426).
The problem is most severe on AIX, but is present in all
operating systems.

Problem conclusion

No actual defect is present.  The regression was caused by
unavoidable changes to classloading which were introduced by a
JDK update.

The problem was resolved by an update to the algorithm
used for loading classes during annotations processing.  The
update provides a speedup of approximitely 5%. The classloading
algorithm was tuned to search most recently successful
classpath elements first when locating new classes.  The
update provides a small reduction of memory usage.

The fix for this APAR is currently targeted for inclusion in
fix packs 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
PM90581
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
2013-06-06
Closed date
2013-07-29
Last modified date
2013-07-29

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:
11 January 2022

Tips

PM90581: SERVER STARTUP REGRESSION (3%) FOR AN ANNOTATIONS ENABLED APPLIC ATION.

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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