CAY-565 was closed as "Can not reproduce", so there was no fix. I
reopened this issue, bumping the priority to "Critical". I will add
synchronization, even though I can't test it.
Andrus
On Sep 12, 2006, at 5:51 AM, Ayhan Kondoz wrote:
Hello,
I am getting NullPointerExceptions when I am trying to use the
shared caching feature of cayenne.
I have 3 servers. Each server has it's own tomcat / axis webservice
and I have an avarage access of about 4 - 5 connections per second.
Each connection results in about 3 - 4 select queries and about 20%
of the connections result in an additional 2 - 3 insert / update
queries. So the servers are working at pretty heavy load.
Yesterday I implemented the usage of cayenne's (remote) shared
caching feature using JavaGroups and at first everything seemed to
work just fine. But after about 1 hour, one of the servers started
to produce NullPointerExceptions on every connection. i found this
bug ( http://issues.apache.org/cayenne/browse/CAY-565 ) which seems
to address my problem but the status is resolved?!
i tried cayenne 1.2 and 1.2B1 and in both cases got this exceptions
but only if shared caching is activated. When I deactivate caching
everything seems to work fine again.
It seems that there is a problem with the syncronization. This
error occursed when under heavy load and a lot of threads are
active at the same time. But if it is really a syncronization
problem the same error could occure on every system (even if much
more unlikely) even if not under heavy load.
Cheers
Ayhan Kondoz
The exception when using common-collections 3.2
[11.09.06 21:30:32] (ERROR): Entry.next=null, data[removeIndex]
=<ObjectId:Customer,
id=534080>[EMAIL PROTECTED]
{suspended=false, login=christian.hantke1, rec_create=Tue May 02
00:00:00 CEST 2006, rec_change=Tue May 02 20:18:34 CEST 2006,
last_updated=Mon Sep 11 21:28:26 CEST 2006, cid=709779451,
id=534080, mandant_id=3}, version=-9223372036854422785,
replaces=-9223372036854775808] previous=<ObjectId:Customer,
d=534080>[EMAIL PROTECTED]
{suspended=false, login=christian.hantke1, rec_create=Tue May 02
00:00:00 CEST 2006, rec_change=Tue May 02 20:18:34 CEST 2006,
last_updated=Mon Sep 11 21:28:26 CEST 2006, cid=709779451,
id=534080, mandant_id=3}, version=-9223372036854422785,
replaces=-9223372036854775808] key=<Ob
jectId:Customer, id=364956>
[EMAIL PROTECTED]
{suspended=false, login=nadda89, rec_create=Thu Mar 30 00:00:00
CEST 2006, rec_change=Thu Mar 30 22:19:00 CEST 2006,
last_updated=Fri Aug 04 16:09:35 CEST 2006, cid=705229711,
id=364956, mandant_id=3}, version=-9223372036854407476,
replaces=-9223372036854775808] size=10000 maxSize=10000 Please
check that your keys are immutable, and that you have used
synchronization properly. If so, then please report this to commons-
[EMAIL PROTECTED] as a bug.
java.lang.IllegalStateException: Entry.next=null, data[removeIndex]
=<ObjectId:Customer,
id=534080>[EMAIL PROTECTED]
{suspended=false, login=christian.hantke1, rec_create=Tue May 02
00:00:00 CEST 2006, rec_change=Tue May 02 20:18:34 CEST 2006,
last_updated=Mon Sep 11 21:28:26 CEST 2006, cid=709779451,
id=534080, mandant_id=3}, version=-9223372036854422785,
replaces=-9223372036854775808] previous=<ObjectId:Customer,
id=534080>[EMAIL PROTECTED]
{suspended=false, login=christian.hantke1, rec_create=Tue May 02
00:00:00 CEST 20 06, rec_change=Tue May 02 20:18:34 CEST 2006,
last_updated=Mon Sep 11 21:28:26 CEST 2006, cid=709779451,
id=534080, mandant_id=3}, version=-9223372036854422785,
replaces=-9223372036854775808] key=<ObjectId:Customer, id=364956>
[EMAIL PROTECTED]
{suspended=false, login=nadda89, rec_create=Thu Mar 30 00:00:00
CEST 2006, rec_change=Thu Mar 30 22:19:00 CEST 2006,
last_updated=Fri Aug 04 16:09:35 CEST 2006, cid=705229711,
id=364956, mandant_id=3}, version=-9223372036854407476,
replaces=-9223372036854775808] size=10000 maxSize=10000 Please
check that your keys are immutable, and that you have used
synchronization properly. If so, then please report this to commons-
[EMAIL PROTECTED] as a bug.
at org.apache.commons.collections.map.LRUMap.reuseMapping
(LRUMap.java:300)
at org.apache.commons.collections.map.LRUMap.addMapping
(LRUMap.java:266)
at org.apache.commons.collections.map.AbstractHashedMap.put
(AbstractHashedMap.java:283)
at
org.objectstyle.cayenne.access.DataRowStore.processUpdatedSnapshots
(DataRowStore.java:537)
at
org.objectstyle.cayenne.access.DataRowStore.processSnapshotChanges
(DataRowStore.java:496)
at
org.objectstyle.cayenne.access.ObjectStore.snapshotsUpdatedForObjects(
ObjectStore.java:559)
at
org.objectstyle.cayenne.access.ObjectResolver.objectsFromDataRows
(ObjectResolver.java:162)
at
org.objectstyle.cayenne.access.ObjectResolver.synchronizedObjectsFromD
ataRows(ObjectResolver.java:137)
at
org.objectstyle.cayenne.access.DataDomainQueryAction.interceptObjectCo
nversion(DataDomainQueryAction.java:363)
at
org.objectstyle.cayenne.access.DataDomainQueryAction.execute
(DataDomainQueryAction.java:151)
at org.objectstyle.cayenne.access.DataDomain.onQuery
(DataDomain.java:715)
at
org.objectstyle.cayenne.util.ObjectContextQueryAction.runQuery
(ObjectContextQueryAction.java:249)
at
org.objectstyle.cayenne.access.DataContextQueryAction.execute
(DataContextQueryAction.java:90)
at org.objectstyle.cayenne.access.DataContext.onQuery
(DataContext.java:1320)
at org.objectstyle.cayenne.access.DataContext.performQuery
(DataContext.java:1309)
The exception when using common-collections 3.1
[11.09.06 15:29:13] (ERROR):
java.lang.NullPointerException
at org.apache.commons.collections.map.LRUMap.reuseMapping
(LRUMap.java:272)
at org.apache.commons.collections.map.LRUMap.addMapping
(LRUMap.java:243)
at org.apache.commons.collections.map.AbstractHashedMap.put
(AbstractHashedMap.java:282)
at
org.objectstyle.cayenne.access.DataRowStore.processUpdatedSnapshots
(DataRowStore.java:612)
at
org.objectstyle.cayenne.access.DataRowStore.processSnapshotChanges
(DataRowStore.java:571)
at
org.objectstyle.cayenne.access.DataRowStore.snapshotsUpdatedForObjects
(DataRowStore.java:313)
at
org.objectstyle.cayenne.access.ObjectResolver.objectsFromDataRows
(ObjectResolver.java:159)
at
org.objectstyle.cayenne.access.ObjectResolver.synchronizedObjectsFromD
ataRows(ObjectResolver.java:134)
at
org.objectstyle.cayenne.access.DataDomainQueryAction.interceptObjectCo
nversion(DataDomainQueryAction.java:373)
at
org.objectstyle.cayenne.access.DataDomainQueryAction.execute
(DataDomainQueryAction.java:151)
at org.objectstyle.cayenne.access.DataDomain.onQuery
(DataDomain.java:766)
at
org.objectstyle.cayenne.util.ObjectContextQueryAction.runQuery
(ObjectContextQueryAction.java:253)
at
org.objectstyle.cayenne.access.DataContextQueryAction.execute
(DataContextQueryAction.java:90)
at org.objectstyle.cayenne.access.DataContext.onQuery
(DataContext.java:1422)
at org.objectstyle.cayenne.access.DataContext.performQuery
(DataContext.java:1411)
Ayhan Kondoz
Software-Entwicklung
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