PM79779: CONCURRENTMODIFICATIONEXCEPTION WHEN STARTING APPLICATIONS IF SERVER STARTED WITH 'START COMPONENTS AS NEEDED'

Fixes are available

APAR status

Closed as program error.

Error description

If you are using the 'start components as needed' option when
starting the server, the component startup sequence will be
changed. Then when starting applications, the following error
will be thrown because a certain component processor is
being registered later than expected:

java.util.ConcurrentModificationException
at
java.util.HashMap$AbstractMapIterator.checkConcurrentMod(HashMap
.java:122)
at
java.util.HashMap$AbstractMapIterator.makeNext(HashMap.java:127)
at java.util.HashMap$ValueIterator.next(HashMap.java:212)
at
com.ibm.ws.injectionengine.InjectionEngineImpl.processorInitiali
zation(InjectionEngineImpl.java:358)
at
com.ibm.ws.injectionengine.InjectionEngineImpl.processInjectionM
etaData(InjectionEngineImpl.java:309)
at
com.ibm.ws.util.ComponentNameSpaceHelper.populateJavaNameSpace(C
omponentNameSpaceHelper.java:806)
at
com.ibm.ws.util.ComponentNameSpaceHelper.populateJavaNameSpace(C
omponentNameSpaceHelper.java:745)
at
com.ibm.ws.webcontainer.webapp.WebAppImpl.scanListeners(WebAppIm
pl.java:656)
at
com.ibm.ws.webcontainer.webapp.WebAppImpl.initialize(WebAppImpl.
java:250)
at
com.ibm.ws.webcontainer.webapp.WebGroupImpl.addWebApplication(We
bGroupImpl.java:100)
at
com.ibm.ws.webcontainer.VirtualHostImpl.addWebApplication(Virtua
lHostImpl.java:166)
at
com.ibm.ws.webcontainer.WSWebContainer.addWebApp(WSWebContainer.
java:732)
at
com.ibm.ws.webcontainer.WSWebContainer.addWebApplication(WSWebCo
ntainer.java:617)
at
com.ibm.ws.webcontainer.component.WebContainerImpl.install(WebCo
ntainerImpl.java:376)
at
com.ibm.ws.webcontainer.component.WebContainerImpl.start(WebCont
ainerImpl.java:668)
...

Local fix

```
N/A
```

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server that use the start components as     *
*                  needed configuration option.                *
****************************************************************
* PROBLEM DESCRIPTION: ConcurrentModificationException may     *
*                      occur when starting applications if     *
*                      'start components as needed' option     *
*                      is used.                                *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
When the 'start components as needed' option is used, some
services provided by the application server are not started
until an application starts which uses those services.
When starting applications enable some container provided
services, such as JPA, BeanValidation, or WebServices, this is
interfering with other concurrently starting applications and
resulting in a ConcurrentModificationException like this:
Caused by: java.util.ConcurrentModificationException
at
java.util.HashMap$AbstractMapIterator.checkConcurrentMod(HashM
ap.java:122)
at
java.util.HashMap$AbstractMapIterator.makeNext(HashMap.java:127)
at java.util.HashMap$ValueIterator.next(HashMap.java:212)
at
com.ibm.ws.injectionengine.InjectionEngineImpl.processorInitiali
zation(InjectionEngineImpl.java:358)
at
com.ibm.ws.injectionengine.InjectionEngineImpl.processInjectionM
etaData(InjectionEngineImpl.java:309)
at
com.ibm.ws.util.ComponentNameSpaceHelper.populateJavaNameSpace(C
omponentNameSpaceHelper.java:806)

Problem conclusion

When the 'start components as needed' option is used, the
injection service that controls which objects may be
referenced by or injected into an application is dynamically
notified of new services as they are started, so that
additional data types may be referenced or injected. A
synchronization problem exists in this application server
service such that if a dynamic notification occurs while an
application is starting, a ConcurrentModificationException may
occur.

The injection service code within the application server
process has been updated to correct this synchronization
problem. Multiple applications may start concurrently with the
'start components as needed' option enabled.

The fix for this APAR is currently targeted for inclusion in
fix packs 7.0.0.29, 8.0.0.6, and 8.5.0.2.  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
PM79779
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
2012-12-28
Closed date
2013-01-10
Last modified date
2013-01-10

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

R700 PSY
UP
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":"7.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
29 October 2021

Tips

PM79779: CONCURRENTMODIFICATIONEXCEPTION WHEN STARTING APPLICATIONS IF SERVER STARTED WITH 'START COMPONENTS AS NEEDED'

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

R850 PSY

Document Information

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