APAR status
Closed as program error.
Error description
ConcurrentModificationException with the database persistence
thread
.
SessionContex E SESN0040E: BackedHashtable:commonSetup - problem
streaming object. Exception caught while trying to serialize
session data for subsequent database write. The session data may
be too large to serialize. Either put less data in the session
or consider configuring Session Manager for MultiRow database
mode.
[6/6/05 11:38:01:153 EDT] 736043d8 SessionContex E Exception is:
java.util.ConcurrentModificationException
at
java.util.HashMap$HashIterator.nextEntry(HashMap.java(Compiled
Code))
at
java.util.HashMap$EntryIterator.next(HashMap.java(Compiled
Code))
at java.util.HashMap.writeObject(HashMap.java(Compiled
Code))
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown
Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethod
AccessorImpl.java(Compiled Code))
at java.lang.reflect.Method.invoke(Method.java(Compiled
Code))
at
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.ja
va(Compiled Code))
at
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.ja
va(Compiled Code))
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStrea
m.java(Compiled Code))
at
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java(
Compiled Code))
at
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream
.java(Inlined Compiled Code))
at
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.ja
va(Compiled Code))
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStrea
m.java(Compiled Code))
at
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java(
Compiled Code))
at
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream
.java(Inlined Compiled Code))
at
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.ja
va(Compiled Code))
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStrea
m.java(Compiled Code))
at
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java(
Compiled Code))
at
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream
.java(Inlined Compiled Code))
at
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.ja
va(Compiled Code))
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStrea
m.java(Compiled Code))
at
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java(
Compiled Code))
at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java(I
nlined Compiled Code))
at
java.util.Hashtable.writeObject(Hashtable.java(Compiled Code))
at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown
Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethod
AccessorImpl.java(Compiled Code))
at java.lang.reflect.Method.invoke(Method.java(Compiled
Code))
at
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.ja
va(Compiled Code))
at
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.ja
va(Compiled Code))
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStrea
m.java(Compiled Code))
at
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java(
Compiled Code))
at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java(C
ompiled Code))
at
com.ibm.ws.webcontainer.httpsession.BackedHashtable.commonSetup(
BackedHashtable.java:2018)
at
com.ibm.ws.webcontainer.httpsession.BackedHashtable.persistSessi
on(BackedHashtable.java:2220)
at
com.ibm.ws.webcontainer.httpsession.BackedHashtable.ejbStore(Bac
kedHashtable.java(Compiled Code))
at
com.ibm.ws.webcontainer.httpsession.BackedHashtable.storeSession
(BackedHashtable.java(Compiled Code))
at
com.ibm.ws.webcontainer.httpsession.BackedHashtable.put(BackedHa
shtable.java(Compiled Code))
at
com.ibm.ws.webcontainer.httpsession.DatabaseSessionContext.sync(
DatabaseSessionContext.java(Compiled Code))
at
com.ibm.ws.webcontainer.httpsession.SessionData.sync(SessionData
.java:297)
at
com.ibm.ws.webcontainer.httpsession.DatabaseSessionData.sync(Dat
abaseSessionData.java:791)
at
com.ibm.ws.webcontainer.httpsession.DatabaseSessionContext.check
ForSessionWrites(DatabaseSessionContext.java(Compiled Code))
at
com.ibm.ws.webcontainer.httpsession.DatabaseSessionContext.async
ExternalWrite(DatabaseSessionContext.java(Compiled Code))
at
com.ibm.ws.webcontainer.httpsession.SessionAlarmListener.alarm(S
essionAlarmListener.java(Compiled Code))
at com.ibm.ejs.util.am._Alarm.run(_Alarm.java(Compiled
Code))
at
com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java(Compiled
Code))
Local fix
No workaround
Problem summary
****************************************************************
* USERS AFFECTED: All WebSphere Application Server users who *
* are using session database persistence. *
****************************************************************
* PROBLEM DESCRIPTION: ConcurrentModificationException may *
* occur if session object is in use *
* while the session persistence thread *
* tries to store the session object into *
* the database. *
****************************************************************
* RECOMMENDATION: *
****************************************************************
[9/16/05 7:42:07:859 EDT] 47803b37 SessionContex E Exception
is: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java
(Compiled Code))
at java.util.HashMap$EntryIterator.next(HashMap.java
(Compiled Code))
at java.util.HashMap.writeObject(HashMap.java(Compiled Code))
at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java(Compiled Code))
at java.lang.reflect.Method.invoke(Method.java(Compiled Code))
at java.io.ObjectStreamClass.invokeWriteObject
(ObjectStreamClass.java(Compiled Code))
at java.io.ObjectOutputStream.writeSerialData
(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.writeOrdinaryObject
(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.writeObject0
(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.defaultWriteFields
(ObjectOutputStream.java(Inlined Compiled Code))
at java.io.ObjectOutputStream.writeSerialData
(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.writeOrdinaryObject
(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.writeObject0
(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.defaultWriteFields
(ObjectOutputStream.java(Inlined Compiled Code))
at java.io.ObjectOutputStream.writeSerialData
(ObjectOutputStream.java(CompiledCode))
at java.io.ObjectOutputStream.writeOrdinaryObject
(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.writeObject0
(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.defaultWriteFields
(ObjectOutputStream.java(Inlined Compiled Code))
at java.io.ObjectOutputStream.writeSerialData
(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.writeOrdinaryObject
(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.writeObject0
(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.writeObject
(ObjectOutputStream.java(Inlined Compiled Code))
at java.util.Hashtable.writeObject(Hashtable.java
(Compiled Code))
at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java(Compiled Code))
at java.lang.reflect.Method.invoke(Method.java(Compiled Code))
at java.io.ObjectStreamClass.invokeWriteObject
(ObjectStreamClass.java(Compiled Code))
at java.io.ObjectOutputStream.writeSerialData
(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.writeOrdinaryObject
(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.writeObject0
(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.writeObject
(ObjectOutputStream.java(Compiled Code))
at com.ibm.ws.webcontainer.httpsession.BackedHashtable.
commonSetup(BackedHashtable.java(Compiled Code))
at com.ibm.ws.webcontainer.httpsession.BackedHashtable.
persistSession(BackedHashtable.java(Compiled Code))
at com.ibm.ws.webcontainer.httpsession.BackedHashtable.
ejbStore(BackedHashtable.java(Compiled Code))
at com.ibm.ws.webcontainer.httpsession.BackedHashtable.
storeSession(BackedHashtable.java(Compiled Code))
at com.ibm.ws.webcontainer.httpsession.BackedHashtable.put
(BackedHashtable.java(Compiled Code))
at com.ibm.ws.webcontainer.httpsession.DatabaseSessionContext.
sync(DatabaseSessionContext.java(Compiled Code))
at com.ibm.ws.webcontainer.httpsession.SessionData.sync
(SessionData.java(Inlined Compiled Code))
at com.ibm.ws.webcontainer.httpsession.DatabaseSessionData.
sync(DatabaseSessionData.java(Inlined Compiled Code))
at com.ibm.ws.webcontainer.httpsession.DatabaseSessionContext.
checkForSessionWrites(DatabaseSessionContext.java
(Compiled Code))
at com.ibm.ws.webcontainer.httpsession.DatabaseSessionContext.
asyncExternalWrite(DatabaseSessionContext.java(Compiled
Code))
at com.ibm.ws.webcontainer.httpsession.SessionAlarmListener.
alarm(SessionAlarmListener.java(Compiled Code))
at com.ibm.ejs.util.am._Alarm.run(_Alarm.java(Compiled Code))
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java
(Compiled Code))
Problem conclusion
ConcurrentModificationException is now gracefully handled.
The fix for this APAR is currently targeted for inclusion
in cumulative fixes 5.02.15 and 5.1.1.9.
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 |
PK14709 |
Reported component name |
WAS NETWRK DEPL |
Reported component ID |
5630A3601 |
Reported release |
10I |
Status |
CLOSED PER |
PE |
NoPE |
HIPER |
NoHIPER |
Special Attention |
NoSpecatt |
Submitted date |
2005-11-07 |
Closed date |
2005-12-05 |
Last modified date |
2005-12-05 |
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Modules/Macros
Publications Referenced
|
Fix information |
Fixed component name |
WAS NETWRK DEPL |
Fixed component ID |
5630A3601 |
Applicable component levels |
R003 PSY |
UP |
R00A PSY |
UP |
R00H PSY |
UP |
R00I PSY |
UP |
R00P PSY |
UP |
R00S PSY |
UP |
R00W PSY |
UP |
R103 PSY |
UP |
R10A PSY |
UP |
R10H PSY |
UP |
R10I PSY |
UP |
R10P PSY |
UP |
R10S PSY |
UP |
R10W PSY |
UP |
|