[sarasvati-wf-users:75] getListeners() in HibGraphProcess

[Dave Butz]

Hi Paul

I'm trying to setup a new WF on Hibernate. I've got problem with the
following method:

newEventQueue.initFromPersisted( getListeners() );

public void initFromPersisted (List<? extends
PersistedExecutionListener> listeners)
{
for ( PersistedExecutionListener listener : listeners )
{
addListener( listenerCache.getListener( listener.getType() ),
listener.getEventTypeMask() );
}
}

I get an exception because the getListerners() method returns null
(I've no listener registered) and then the for loop throws a
NullPointerException

It is recommended to have a ExecutionListener registered?

Thanks

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[Paul Lorenz]

Hmm, I'm trying to figure out why getListeners would return null. If it's a new instance, it's initialized in the constructor to an empty list. When loading from the DB, my understanding was that hibernate would always give you back an empty list if you didn't have any constituents.

Is this a new instance or one you're pulling from the database? Are you ever explicitly setting the listeners to null?

You should not any execution listeners registered, so if my understanding of hibernate behavior is incorrect, or behavior has changed, this will need a patch.

Cheers,
Paul

[Dave Butz]

It's a new instance and I do not set the listeners to null explicitly.
I just use your example and added the following code inside the "if
(doInit)":

while ( true )
{
Session session = HibTestSetup.openSession();
Transaction t = session.beginTransaction();
HibEngine engine = new HibEngine( session );

if (doInit)
{
engine.addNodeType("dump", DumpNode.class);
HibGraph graph = engine.getFactory().newGraph("TestGraph", 1,
"100");
Node firstNode = engine.getFactory().newNode(graph,
"FirstNode", "dump", JoinType.FIRST, null, true, null, null);
Node secondNode = engine.getFactory().newNode(graph,
"SecondNode", "dump", JoinType.FIRST, null, false, null, null);
HibArc arc = engine.getFactory().newArc(graph, firstNode,
secondNode, "TestArc");
engine.addExecutionListener(LoggingExecutionListener.class,
ExecutionEventType.values());
doInit = false;
}

HibGraph choosenGraph = getGraph( engine );

HibGraphProcess process =
(HibGraphProcess)engine.startProcess( choosenGraph );

session.flush();
t.commit();
session.close();

runWorkflow( process.getId() );

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[Paul Lorenz]

Found it. It's not the HibGraphProcess, but the HibGraph (from what I
can see) that can have a null listener list. As a short term work
around you can call graph.setListeners( new
LinkedList<HibGraphListener>() );

I created issue 60 for this (http://code.google.com/p/sarasvati/issues/
detail?id=60) and have committed a fix. I'll try to get a point
release out soon.

Let me know if you think this won't resolve your issue.

Cheers,
Paul

[Dave Butz]

Thanks! Your fix is working cause I use the newest trunk.

:-)