I have 2 classes A and B. B is subclass of A. A contain an ID and B contains a name. So the mapping file is quite simple. I get the error below. Any clues? Thanks for any help.

hib version: 2.1.3
database: m$ sql server 2000

mapping file...
<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
<class
name="org.tireetoo.tig.core.A"
table="A"
dynamic-update="false"
dynamic-insert="false"
>

<id
name="id"
column="id"
type="java.lang.Long"
>
<generator class="native">
</generator>
</id>

<!--
To add non XDoclet property mappings, create a file named
hibernate-properties-A.xml
containing the additional properties and place it in your merge dir.
-->

<joined-subclass
name="org.tireetoo.tig.core.B"
table="B"
dynamic-update="false"
dynamic-insert="false"
>
<key
column="B_ID"
/>
<property
name="name"
type="java.lang.String"
update="true"
insert="true"
column="name"
/>

</joined-subclass>

</class>

</hibernate-mapping>

contents of log file...
2004-06-04 10:58:16,561 INFO cfg.Environment [main] Hibernate 2.1.3
2004-06-04 10:58:16,561 INFO cfg.Environment [main] hibernate.properties not found
2004-06-04 10:58:16,577 INFO cfg.Environment [main] using CGLIB reflection optimizer
2004-06-04 10:58:16,593 INFO cfg.Configuration [main] configuring from resource: /hibernate.cfg.xml
2004-06-04 10:58:16,593 INFO cfg.Configuration [main] Configuration resource: /hibernate.cfg.xml
2004-06-04 10:58:16,780 INFO cfg.Configuration [main] Mapping resource: org/tireetoo/tig/core/A.hbm.xml
2004-06-04 10:58:16,890 INFO cfg.Binder [main] Mapping class: org.tireetoo.tig.core.A -> A
2004-06-04 10:58:17,030 INFO cfg.Binder [main] Mapping joined-subclass: org.tireetoo.tig.core.B -> B
2004-06-04 10:58:17,030 INFO cfg.Configuration [main] Mapping resource: org/tireetoo/tig/core/B.hbm.xml
2004-06-04 10:58:17,030 ERROR testclient.ServiceTest [main] bad stuff - ex message: null
java.lang.NoClassDefFoundError
at org.tireetoo.tig.testclient.ServiceTest.testRolesAndUsers(ServiceTest.java:77)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:289)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:523)

How should we know, we don't have ServiceTest.java:77

Line 77 is the HibernateUtil.closeSession()line.
HibernateUtil has the usual...
static {
try {
sessionFactory = new Configuration().configure().buildSessionFactory();
} catch (HibernateException ex) {
throw new RuntimeException("Exception building SessionFactory: " + ex.getMessage(), ex);
}
}
Is this the problem?

Apologies for not including the test code...

package org.tireetoo.tig.testclient;

import junit.framework.TestCase;
import org.tireetoo.tig.service.CentralSystem;
import org.tireetoo.tig.api.*;
import org.tireetoo.tig.core.*;
import org.tireetoo.tig.persistence.HibernateUtil;
import org.picocontainer.PicoContainer;
import org.apache.log4j.Logger;

import java.util.Set;
import java.util.TreeSet;

import net.sf.hibernate.Transaction;
import net.sf.hibernate.Session;
import net.sf.hibernate.HibernateException;






/**
*
*
*/
public class ServiceTest extends TestCase {

private static Logger LOG = Logger.getLogger(ServiceTest.class.getName());

public ServiceTest(String s) {
super(s);
}

public void setUp() {
}

public void testRolesAndUsers() throws Throwable {
// get pico container
PicoContainer pc = CentralSystem.getInstance().getContainer();

Transaction tx = null;

try {
// start transaction here
Session sess = HibernateUtil.currentSession();
tx = sess.beginTransaction();

// create some roles
BService rs = (BService)pc.getComponentInstanceOfType(BService.class);
B adminRole = rs.createRole("system-administrator");
B respRole = rs.createRole("responsible-officer");

// and some users
Set defaultAdminRoles = new TreeSet();
defaultAdminRoles.add(adminRole);
CService us = (CService)pc.getComponentInstanceOfType(CService.class);
C user = us.createUser("bob", "bobby", defaultAdminRoles);

Set defaultRespOffRoles = new TreeSet();
defaultRespOffRoles.add(respRole);
C user2 = us.createUser("tom", "thomas", defaultRespOffRoles);

// and commit here
tx.commit();
} catch(Exception ex) {
if (tx != null) {
try {
tx.rollback();
} catch (HibernateException e) {
throw e;
}
}
} finally {
// make sure that the session is closed
try {
HibernateUtil.closeSession();
} catch (Throwable ex) {
LOG.error("bad stuff - ex message: " + ex.getMessage(), ex);
throw ex;
}
}
}
}

A bit more info.
This test is run from ANT 1.6.1 with a fork new JVM.
It is a JUnit test.

Replace this:



with that:



Yes, I know that you got it from the Hibernate documentation.

In the log file I now get...
net.sf.hibernate.MappingException: Resource: org/tireetoo/tig/core/B.hbm.xml not found
at net.sf.hibernate.cfg.Configuration.addResource(Configuration.java:331)
at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:990)
at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:946)
at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:874)
at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:860)
at org.tireetoo.tig.persistence.HibernateUtil.<clinit>(HibernateUtil.java:18)

Which is because I mention it in my hibernate.cfg.xml file but I dont create it because all the info is in A.hbm.xml !! Dah, Dah.

Its not easy getting all the info out of users is it. :-)
Thanks very much for the help.

If all my persistent types derive from a common type that includes an ID and a name, creation time etc. Is it okay for all the mapping info to go into one file?

One mapping file per persistent class is common practice (and expected by some tools).

How do I get hibernate to create one mapping file per persistent class?

However I am not getting any data saved now. No rows in tables.
Should I turn on hibernate debug logging and get back with results?

You should start reading the documentation and tutorials.

Oh, and for inheritance mappings, you can either put the whole class hierarchy in a single mapping file (of course, since <subclass> and <joined-subclass> are child elements of <class>) or use the <class extends=""> mapping.

Can I get xdoclet to do that?

Well it all came down to the catch block in ServiceTest. It was catching exception, rolling back transaction and NOT throwing the transaction higher up the chain (and failing to log it). The anti-pattern of transaction swallowing.

Basically dodgy coding. :-)

Thanks for all the help christian.
I have to add that this is the fastest, best informed and helpful developer forum I have come across. Even better than NSIS. :-) And loads better than the TopLink support we used in the past.

You guys just need to get rid of that naff NoClassDefFoundError with null message. :-)

Im now back on the developing enterprise app track. And happy too.