Re: upgrade to RC5, ClassCastException on getCollectionByQuery

[Armin Waibel]

Hi Raymond,

> I suspect it is something still hanging around from rc3 in my paths.
> I've updated all the relevant jars (that I can think of), the
> OJB.properties, the repository xml files etc.
ok, that's all you can do.
hmm, your code works with rc3 and don't work with rc5 - right?
If so, sounds like a bug in rc5.
Make OJB jars with target 'jar-debug' instead 'jar', then the line 
numbers will be included in stack trace.

Could you post the class-descriptor for Employee?
I will try to write a test case for your problem.
regards,
Armin
Raymond Barlow wrote:
Hi all,

I've been chasing this all day, and have gotten no further *sigh*.

Why does the following code give me a ClassCastException on the 
getCollectionByQuery??

     PersistenceBroker broker = null;
       Criteria criteria = new Criteria();
       criteria.addEqualTo("userName", "test");
       Query query = new QueryByCriteria(Employee.class, criteria);
       try
       {
           broker = PersistenceBrokerFactory.defaultPersistenceBroker();
//dies on this line:
           Collection results = broker.getCollectionByQuery(query);
           Vector v = new Vector();
           v.addAll(results);
           Employee u = (Employee)v.get(0);
           System.out.println(u.getUserName());
       }
       catch (Throwable t)
       {
           t.printStackTrace();
       }
       finally
       {
           if(broker != null)
               broker.close();
       }
stack trace:
org.apache.ojb.broker.PersistenceBrokerException: 
java.lang.ClassCastException
   at 
org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown 
Source)
   at 
org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown 
Source)
   at 
org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Unknown 
Source)
   at 
org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQuery(Unknown 
Source)
   at 
org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQuery(Unknown 
Source)
   at com.hours28.test.TempTest.test1(TempTest.java:40)
   at com.hours28.test.TempTest.main(TempTest.java:28)
Caused by: java.lang.ClassCastException
   at 
org.apache.ojb.broker.accesslayer.BasePrefetcher.prefetchRelationship(Unknown 
Source)
   at 
org.apache.ojb.broker.core.QueryReferenceBroker.performRetrievalTasks(Unknown 
Source)
   at 
org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown 
Source)
   ... 7 more

I suspect it is something still hanging around from rc3 in my paths. 
I've updated all the relevant jars (that I can think of), the 
OJB.properties, the repository xml files etc.

Another strange thing about this is that if I run this twice (ie, after 
the exception, try it again without restarting the session), it works. 
Strange. It seems like it just doesn't load classes correctly on the 
first search for them.

Any suggestions?



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