[dlittman]

I have tried the quick start exercise for hibernate with derby. I have a good connection to the db and can generate the hbm file (one table). The table has an id field [(integer not null generated always as identity (start with 1 increment by 1)] and a few varchars.

The hbm file comes back ill-formed. It does not have the required “id” clause. I put in the id clause myself and the file is formed okay on rebuild.

When I run the “HibernateTest” main the first message comes back okay (Hello from hibernate). It then gives the log4j message (which are okay to ignore according to the tutorial) and then gives a session factory error(blow).

What am I doing wrong?

Thanks in advance.

OUTPUT–

%%%% Error Creating SessionFactory %%%%
org.hibernate.MappingException: Error reading resource: com/genuitec/hibernate/Tv.hbm.xml
at org.hibernate.cfg.Configuration.addResource(Configuration.java:452)
at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1263)
at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1235)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1217)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1184)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1112)
at com.genuitec.hibernate.SessionManager.currentSession(SessionManager.java:48)
at com.genuitec.hibernate.HibernateTest.main(HibernateTest.java:16)
Caused by: org.hibernate.PropertyNotFoundException: field not found: id
at org.hibernate.property.DirectPropertyAccessor.getField(DirectPropertyAccessor.java:96)
at org.hibernate.property.DirectPropertyAccessor.getField(DirectPropertyAccessor.java:103)
at org.hibernate.property.DirectPropertyAccessor.getField(DirectPropertyAccessor.java:103)
at org.hibernate.property.DirectPropertyAccessor.getGetter(DirectPropertyAccessor.java:111)
at org.hibernate.util.ReflectHelper.getter(ReflectHelper.java:90)
at org.hibernate.util.ReflectHelper.reflectedPropertyClass(ReflectHelper.java:78)
at org.hibernate.mapping.SimpleValue.setTypeUsingReflection(SimpleValue.java:275)
at org.hibernate.cfg.HbmBinder.bindSimpleId(HbmBinder.java:360)
at org.hibernate.cfg.HbmBinder.bindRootPersistentClassCommonValues(HbmBinder.java:294)
at org.hibernate.cfg.HbmBinder.bindRootClass(HbmBinder.java:236)
at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:152)
at org.hibernate.cfg.Configuration.add(Configuration.java:362)
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:400)
at org.hibernate.cfg.Configuration.addResource(Configuration.java:449)
… 7 more
Exception in thread “main” java.lang.NullPointerException
at com.genuitec.hibernate.SessionManager.currentSession(SessionManager.java:56)
at com.genuitec.hibernate.HibernateTest.main(HibernateTest.java:16)

[dlittman]

I had to remove the property clause in the cfg that referred to the id I put in by hand. I would still like to know why ME does not generate the id clause itself and returns an ill-formed cfg file.

In this case it did not use the table id as the id and just put it in as a regular old column.

Perhaps this has to do with the fact that there does not appear to be a derby dialect in the list of choices — I selected “Generic”. Is there a derby dialect available?

[bobcoss]

Yes, you can use the derby dialect. I was using going through the tutorial yesterday, and selected the derby dialect.

From my <hibernate-configuration> file.
<property name=”dialect”>org.hibernate.dialect.DerbyDialect</property>

Generated:
<id name=”id” type=”integer”>
<column name=”ID” />
<generator class=”increment” />
</id>

Hope that helps.

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