PI70841: OpenJPA's ConfigurationImpl.loadGlobals() has java.util.ConcurrentModificationException

Fixes are available

APAR status

Closed as program error.

Error description

The following block in the OpenJPA's
ConfigurationImpl.loadGlobals() method contains:

// let system properties override other globals
try {
fromProperties(new HashMap(
AccessController.doPrivileged(
J2DoPrivHelper.getPropertiesAction())));

This retrieves a Properties object from
System.getProperties(), which is passed to HashMap's ctor.
The ctor interacts with an enumerator associated with the
Properties object to populate the new HashMap instance.
However, if another thread mutates the JVM's System
Properties, it can result in a
ConcurrentModificationException as observed below:

Caused by: java.util.ConcurrentModificationException
at java.util.Hashtable$Enumerator.next(Hashtable.java:1256)
at java.util.HashMap.putAllForCreate(HashMap.java:566)
at java.util.HashMap.<init>(HashMap.java:310)
at
org.apache.openjpa.lib.conf.ConfigurationImpl.loadGlobals(Co
nfigurationImpl.java:189)

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server Liberty and traditional V8.5.5 and   *
*                  V9.0.0  - Java Persistence API (JPA)        *
****************************************************************
* PROBLEM DESCRIPTION: OpenJPA's                               *
*                      ConfigurationImpl.loadGlobals() has     *
*                      java.util.ConcurrentModificationExcepti *
*                      on                                      *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The following block in the OpenJPA's
ConfigurationImpl.loadGlobals() method contains:

// let system properties override other globals
try {
fromProperties(new HashMap(
AccessController.doPrivileged(
J2DoPrivHelper.getPropertiesAction())));

This retrieves a Properties object from System.getProperties(),
which is passed to HashMap's ctor. The ctor interacts with an
enumerator associated with the Properties object to populate the
new HashMap instance. However, if another thread mutates the
JVM's System Properties, it can result in a
ConcurrentModificationException as observed below:

Caused by: java.util.ConcurrentModificationException
at java.util.Hashtable$Enumerator.next(Hashtable.java:1256)
at java.util.HashMap.putAllForCreate(HashMap.java:566)
at java.util.HashMap.<init>(HashMap.java:310)
at
org.apache.openjpa.lib.conf.ConfigurationImpl.loadGlobals(Config
urationImpl.java:189)

Problem conclusion

With this fix, code has been added to OpenJPA to ensure that
method ConfigurationImpl.loadGlobals() is property synchronized
to avoid potential concurrent modifications.

The fix for this APAR is currently targeted for inclusion in
Service Levels (Fix Packs) 8.5.5.12 and 9.0.0.3 of WebSphere
Application Server versions 8.5.5 and 9.0.0, and fix pack
17.0.0.1 for WebSphere Application Server Liberty.  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
PI70841
Reported component name
LIBERTY PROFILE
Reported component ID
5724J0814
Reported release
855
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-10-18
Closed date
2016-10-20
Last modified date
2016-10-20

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
LIBERTY PROFILE
Fixed component ID
5724J0814

Applicable component levels

R855 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":"855","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
03 May 2022

Tips

PI70841: OpenJPA's ConfigurationImpl.loadGlobals() has java.util.ConcurrentModificationException

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

R855 PSY

Document Information

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