ojb.properties, weblogic, and threads

[Bonnie MacKellar <BM...@mobius.com>]

I thought I had worked all the bugs out of my Weblogic-with-OJB
configuration,
but I guess I was wrong.
I am using Weblogic to run a servlet which calls a simple test application.
As long as access is done in a single thread, there is no problem.
But when I spawn a new thread, and try to retrieve a broker within the new
thread, I get an exception indicating that OJB.properties cannot be found.
I would have thought this is a simple classpath problem, except that
there is no problem obtaining a broker in the orginating thread. Has anyone
encountered this before?

I have my OJB.properties, repository files and compiled class files in 
C:\bea\user_projects\bonnie\applications\ActiveBill\WEB-INF\classes
where ActiveBill is the deployed application. I am not using a startup
class to bind the OJB.properties location, because I was told at some
point that this is not needed for a strictly servlet based application (no
EJBs).

Here is the code :
public class AccountUpdater extends Thread
{
    private PersistenceBroker broker = null;
 
    public void run()
    {
      for (int i=0;i<10;i++)
      {
       try
        {
           broker = PersistenceBrokerFactory.defaultPersistenceBroker();
          
           broker.beginTransaction();
           AccountInterface acc = retrieveAccountByNumber("1234");      
           broker.commitTransaction();
        }
       catch (Exception e)
            {
              broker.abortTransaction();
              System.out.print(e.getMessage());
              e.printStackTrace();
             }
       finally {
       	  broker.close();
       }
      }
    	
    }

The exception is thrown at the line which calls defaultPersistenceBroker()
Here is the exception :

[BOOT] ERROR: Cannot get OJB properties file, use default settings!
[org.apache.ojb.broker.ta.PersistenceBrokerFactoryDefaultImpl] INFO: Create
Pers
istenceBroker instance pool, pool configuration was {whenExhaustedAction=0,
maxI
dle=-1, maxActive=21, maxWait=5000, removeAbandoned=false,
numTestsPerEvictionRu
n=10, testWhileIdle=false, minEvictableIdleTimeMillis=600000,
testOnReturn=false
, logAbandoned=false, removeAbandonedTimeout=300,
timeBetweenEvictionRunsMillis=
-1, testOnBorrow=false}
[org.apache.ojb.broker.metadata.RepositoryPersistor] INFO: OJB Descriptor
Reposi
tory: file:/C:/bea/user_projects/bonnie/repository.xml
java.lang.NullPointerException
        at dbtests.AccountUpdater.run(AccountUpdater.java:64)
in testDatabase
accessed the database
in AccountUpdater.run
will try to get a broker
java.lang.NullPointerException
        at dbtests.AccountUpdater.run(AccountUpdater.java:64)


thanks,
Bonnie MacKellar
software engineer
Mobius Management Systems, Inc.
bmackell@mobius.com