I did it yesterday and now I'm getting the already known NPE again. And I'm sure that I didn't changed the cayenne version. But what I saw is that in the case of NPE always the same method of me is called. As a starting point I can synchronize the method, but it shouldn't be neccessary. Here's the method that causes the NPE:
public boolean isLoggerAlreadyAvailable(DaoContextIfc ctx, String loggerSerialNumber) {
DataContext context = getDaoContext(ctx);
Expression expr = ExpressionFactory.matchExp("serialNumber", loggerSerialNumber).orExp(ExpressionFactory.matchExp("newSerialNumber", loggerSerialNumber));
SelectQuery query = new SelectQuery(TblLogger.class, expr);
List<TblLogger> loggerList = (List<TblLogger>) context.performQuery(query);
if (loggerList.size() == 0) {
return false;
}
return true;
}
No instance variables are used.
I've seen also that the class 'SQLTemplateResourceManager' uses a LRUMap. And there wereall access to LRUMap already synchronized. Maybe you can take a look at that class.
Another question :
I have a class which is extended from 'WebApplicationListener'. In the method 'sessionDestroyed' the following code is executed :
ObjectStore objectStore = dctx.getObjectStore();
objectStore.objectsInvalidated(objectStore.getObjects());
It that really neccessary ? The code was written by some programmers, which has leaved the company.
Thank, Lothar
> -----Ursprüngliche Nachricht-----
> Von: cayenne-use..ncubator.apache.org
> Gesendet: 15.06.06 11:51:59
> An: cayenne-use..ncubator.apache.org
> Betreff: Re: IllegalStateException in DataRowStore (thrown by LRUMap)
>
> On Jun 15, 2006, at 1:43 PM, Lothar Krenzien wrote:
>
> > I'm using the recent 3.2 version of commons collection and the
> > recent 1.2 RC1 cayenne version. The exception occurs mostly on
> > high high activitity on the server. But then very often. Basicly
> > my clients call a servlet and make a post. The servlet should
> > import the posted data into a database (MSSQL 2000) using DAO
> > classes. The relevant methods in the DAO classes are all
> > synchronized (even it should not be necessary).
> >
> > Hope that helps
> > Lothar
>
> Thanks for the info. Can you downgrade to commons-collections 3.1?
> This is the version we are currently using in Cayenne, so this is the
> version I will be using as a part of CAY-565 investigation.
>
> Andrus
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