Hi Armin,
no, every thread and function creates a new Persistence Broker before any database interaction.
Regards, Oliver
Armin Waibel wrote:
Hi Oliver,
could it happen that
de.virtualsolution.util.OJBUtil.retrieve(OJBUtil.java:174)
and
de.virtualsolution.util.OJBUtil.delete(OJBUtil.java:152)
was called by concurrent threads at the same time (on the same PB instance)?
regsrds, Armin
Oliver Mihatsch wrote:
Hm, this could be the cause, but not sure:
java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at org.apache.ojb.broker.core.PersistenceBrokerAbstractImpl.addListener(PersistenceBrokerAbstractImpl.java:112)
at org.apache.ojb.broker.core.PersistenceBrokerAbstractImpl.addListener(PersistenceBrokerAbstractImpl.java:87)
at org.apache.ojb.broker.accesslayer.RsIterator.<init>(RsIterator.java:205)
at org.apache.ojb.broker.core.RsIteratorFactoryImpl.createRsIterator(RsIteratorFactoryImpl.java:58)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getRsIteratorFromQuery(PersistenceBrokerImpl.java:1808)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getIteratorFromQuery(PersistenceBrokerImpl.java:1333)
at org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(QueryReferenceBroker.java:111)
at org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(QueryReferenceBroker.java:233)
at org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(QueryReferenceBroker.java:269)
at org.apache.ojb.broker.core.QueryReferenceBroker.retrieveCollection(QueryReferenceBroker.java:566)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.refreshRelationships(PersistenceBrokerImpl.java:1184)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.doGetObjectByIdentity(PersistenceBrokerImpl.java:1378)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByIdentity(PersistenceBrokerImpl.java:1346)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByQuery(PersistenceBrokerImpl.java:1435)
at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByQuery(DelegatingPersistenceBroker.java:307)
at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByQuery(DelegatingPersistenceBroker.java:307)
at de.virtualsolution.util.OJBUtil.retrieve(OJBUtil.java:174) ...
Oliver Mihatsch wrote:
Hello,
in a web application I developed there is a strange error which occurs every 2 Weeks - 2 Months:
java.lang.NullPointerException
at org.apache.ojb.broker.core.PersistenceBrokerAbstractImpl.notifiyStateListener(PersistenceBrokerAbstractImpl.java:350)
at org.apache.ojb.broker.core.PersistenceBrokerAbstractImpl.fireBrokerEvent(PersistenceBrokerAbstractImpl.java:305)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.beginTransaction(PersistenceBrokerImpl.java:400)
at org.apache.ojb.broker.core.DelegatingPersistenceBroker.beginTransaction(DelegatingPersistenceBroker.java:139)
at org.apache.ojb.broker.core.DelegatingPersistenceBroker.beginTransaction(DelegatingPersistenceBroker.java:139)
at de.virtualsolution.util.OJBUtil.delete(OJBUtil.java:152) ....
OJB Version I'm using is ojb-1.0.1. It is self compiled to get the debug informations.
After the error occurs every ojb db access fails with this NPE. Only restarting the application helps.
The error is reproducable, but it takes ca. 2 Weeks - 2 Months to get it ;)
I think only insert/update/delete actions produces it, but not sure.
Thanks in advance, Oliver Mihatsch
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