Hibernate version:

3.2

Mapping documents:

persist.xml (in META-INF which also contains correctly populated services directory containing persistence providers)...

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/ ... ce_1_0.xsd"
version="1.0">

<persistence-unit name="sample" transaction-type="RESOURCE_LOCAL">
<class>com.somedomain.adhoc.ejb3.Person</class>

<properties>
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
<property name="hibernate.connection.username" value="root" />
<property name="hibernate.connection.password" value="root" />
<property name="hibernate.connection.url" value="jdbc:mysql://localhost/test" />
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
<property name="hibernate.hbm2ddl.auto" value="update" />
</properties>

</persistence-unit>
</persistence>



Code between sessionFactory.openSession() and session.close():


EntityManagerFactory emf = Persistence.createEntityManagerFactory("sample", new HashMap());
EntityManager em = emf.createEntityManager();
EntityTransaction tx = em.getTransaction();
tx.begin();
em.persist(new Person("Ben Franklin"));
tx.commit();
em.close();


Full stack trace of any exception that occurs:

Exception in thread "main" java.lang.IncompatibleClassChangeError
at org.hibernate.ejb.Version.<clinit>(Version.java:15)
at org.hibernate.ejb.Ejb3Configuration.<clinit>(Ejb3Configuration.java:112)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:119)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:51)
at com.webfuture.adhoc.ejb3.Runner.run(Runner.java:31)
at com.webfuture.adhoc.ejb3.Runner.main(Runner.java:16)

Name and version of the database you are using:

MySQL 5.0.21

The generated SQL (show_sql=true):

N/A - does not get that far

Debug level Hibernate log excerpt:

N/A

Tried using binaries found here. After that did not work, tried compiling using source supplied in the above downloads, but to no avail (same issue).

Are the classes in the distribution compatiable with each other?

yes they are. Whcih VM are you using?

After further debugging, it looks as if the problem centers on the incompatibility of log4j classes in the MySQL distribution compared with those of the Hibnerate 3.2 distribution.

Hibernate has not hard dependency on log4j
We use commons logging as an abstraction

I had the same problem and was solved.

One of the reasons could be checking any incompatible hibernate jars in your distribution (App server like JBoss 4.X Vs your own application's WEB-INF/lib).