Hi !
I have two tables with one to many inverse mapping.
Parent and Child
Through ParentManager.java, I have successfully inserted a child int db using statement like parent.addChild()

now I am writing ChildManager and want to write a method to get list of all child tuples in tables
and currently I am doing
String SQL_STRING = "FROM Child";
Query query = session.createQuery(SQL_STRING);
ArrayList list = (ArrayList)query.list();

When I run this method I get an error message like
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
java.lang.NullPointerException
at org.hibernate.tuple.AbstractEntityTuplizer.createProxy(AbstractEntityTuplizer.java:372)
at org.hibernate.persister.entity.AbstractEntityPersister.createProxy(AbstractEntityPersister.java:3121)
at org.hibernate.event.def.DefaultLoadEventListener.createProxyIfNecessary(DefaultLoadEventListener.java:232)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:173)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:87)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:891)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:859)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
at org.hibernate.type.EntityType.resolve(EntityType.java:303)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:113)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842)
at org.hibernate.loader.Loader.doQuery(Loader.java:717)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
at org.hibernate.loader.Loader.doList(Loader.java:2145)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029)
at org.hibernate.loader.Loader.list(Loader.java:2024)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:375)
at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:308)
at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:153)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1129)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
at au.com.home.hibernate.manager.Manager.getChilds(Manager.java:83)
at au.com.home.client.Client.main(Client.java:11)
Exception in thread "main"
Java Result: 1
I would appreciate any hints or suggestions

I had the same problem when migrating from 3.0 to 3.2.
In my case, it turned out to be caused by asm.jar and asm-attrs.jar not being in the class path.

If that doesn't do it, configure log4j and check the log.

Vula !
only If I knew that this will solve the problem before.... thankx for your reply