NullPointerException in OjbExtent

[Lukas Severin]

I get the following exception running a JDO query in tomcat (if I run it
standalone it works just fine) :

java.lang.NullPointerException
        at org.apache.ojb.jdori.sql.OjbExtent.<init>(Unknown Source)
        at org.apache.ojb.jdori.sql.OjbStoreManager.getExtent(Unknown
Source)
        at com.sun.jdori.common.PersistenceManagerImpl.getExtent(Unknown
Source

        at com.sun.jdori.common.query.QueryImpl.checkCandidates(Unknown
Source)
        at com.sun.jdori.common.query.QueryImpl.execute(Unknown Source)

My query code :
PersistenceManagerFactory factory = new OjbStorePMF();
PersistenceManager pm = factory.getPersistenceManager();
Query q = null;
Collection c = null;
User user = null;
try {
    String filter = "this.id == " +userId;
    q = pm.newQuery(User.class, filter);
    c = (Collection) q.execute();
    user  = (User) c.iterator().next();
etc ...



My OJB.properties and repository files are in WEB-INF/classes.

Thanks for suggestions to solve this !


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