Maybe closer...

Maybe I'm getting closer to it....

In order to execute a workflow task, we have a Scheduler that creates 
new threads (ExecutionElement that implements Runnable).

If I overwrite this behaviour and call the run() method directly all 
works well....
However if I let the Scheduler create a new thread, I get the null 
ponter exception at the fetch() method.
I've been looking to Database.java and I found out that there are 4 
methods being called it it:

        TransactionManager  transactionManager  =   env.transactionManager;
        Transaction         currentTransaction  =   
transactionManager.currentTA();
        ObjectID            id                  =   rObj.remoteID();
        ObjectContainer     container           =   
currentTransaction.acquireObjectAndPin( id, lockLevel );

I've tried to call remoteID from outsied of the fetch method and I get a 
number -> no null pointer here. So we are reduced to 3 methods:


        TransactionManager  transactionManager  =   env.transactionManager;
        Transaction         currentTransaction  =   
transactionManager.currentTA();
        ObjectContainer     container           =   
currentTransaction.acquireObjectAndPin( id, lockLevel );

Every methods here are transaction-related. That makes me wander how 
Ozone handles transactions.

So until now, I know two things: the null pointer IS related with new 
threads and MAYBE is related with transactions.

So this is what I'm doing:

Create the ozone object -> ok
Create a new "regular" object that implements runnable inside the ozone 
object -> ok
Execute a method on the ozone object ->ok
The method launches a new thread -> ok
The new thread tries to fetch an object from the database -> BOOM

I hope this information is usefull.

Best regards,
Gonçalo.





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