[mm2ha]

Hi, I have been following this tutorial for hibernate:
http://www.laliluna.de/first-hibernate-example-tutorial.html , I did also the one on this website(that worked kind of ok, but not too good either). My problem is that when I try to run it with this code:

public static void main(String[] args) {
        
Line 25        Integer primaryKey = createHoney();
        System.out.println("primary key is " + primaryKey);
        updateHoney(primaryKey);
        listHoney();
    }

where honey is my database with fields id, name, taste, I get this error:

java.lang.NoClassDefFoundError: org/dom4j/Attribute
    at hibernate.HibernateSessionFactory.<clinit>(HibernateSessionFactory.java:30)
    at hibernate.TestClient.createHoney(TestClient.java:43)
    at hibernate.TestClient.main(TestClient.java:25)
Exception in thread "main" 

code from TestClient.createHoney:

private static Integer createHoney() {
        Session session = null;
        Transaction tx = null;
        Logger log = Logger.getLogger("TestClient");

        log.info("creating honey");

        // [laliluna] our returned primary key
        Integer id = null;

        try {
            // [laliluna] get the session from the factory
line 43:        session = HibernateSessionFactory.currentSession();

            // [laliluna] always start a transaction before doing something
            // (even reading) from the database
            tx = session.beginTransaction();

            // [laliluna] create a new object
            Honey honey = new Honey();
            honey.setName("Sebastian's favourite honey");
            honey.setTaste("sweet");

            // [laliluna] save it to the database, Hibernate returns your object
            // with the primary key field updated!
            id = (Integer) session.save(honey);

            // [laliluna] commit your transaction or nothing is wrote to the db
            tx.commit();

            // [laliluna] clean up (close the session)
            session.close();

and from HibernateSessionFactory:

    private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";

    /** Holds a single instance of Session */
    private static final ThreadLocal threadLocal = new ThreadLocal();

    /** The single instance of hibernate configuration */
    private static Configuration cfg = new Configuration();

    /** The single instance of hibernate SessionFactory */
    private static net.sf.hibernate.SessionFactory sessionFactory;

    /**
     * Returns the ThreadLocal Session instance.  Lazy initialize
     * the <code>SessionFactory</code> if needed.
     *
     *  @return Session
     *  @throws HibernateException
     */
    public static Session currentSession() throws HibernateException {
        Session session = (Session) threadLocal.get();

        if (session == null || ! session.isConnected()) {
            if (sessionFactory == null) {
                try {
                    cfg.configure(CONFIG_FILE_LOCATION);
                    sessionFactory = cfg.buildSessionFactory();
                }
                catch (Exception e) {
                    System.err.println("%%%% Error Creating SessionFactory %%%%");
                    e.printStackTrace();
                }
            }
            session = sessionFactory.openSession();
            threadLocal.set(session);
        }

        return session;
    }

    /**
     *  Close the single hibernate session instance.
     *
     *  @throws HibernateException
     */
    public static void closeSession() throws HibernateException {
        Session session = (Session) threadLocal.get();
        threadLocal.set(null);

        if (session != null) {
            session.close();
        }
    }

    /**
     * Default constructor.
     */
    private HibernateSessionFactory() {
    }

}

I created the hibernate thorough your tutorial(MyEclipse->add hib) and also did the hibernate mapping to the honey table. But i really dont understand what that no class def could be. Please help me, if you know what can be the problem. thanks a lot

[Riyad Kalla]

Is your dom4j JAR file in your WEB-INF/lib directory?

[mm2ha]

I am creating just a java application, so I did not have the web-in folder. but yes, i had the dom4j file in the /lib directory with all the other files needed for hibernate. then I have mooved all of them just to the / , but that did not work either.

[mm2ha]

by the way, it is dom4j-1.6.jar file

[mm2ha]

when I add another dom4j file, this time the dom4j.jar from the jboss\lib directory, I get this error:

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
    at net.sf.hibernate.cfg.Configuration.<clinit>(Configuration.java:95)
    at hibernate.HibernateSessionFactory.<clinit>(HibernateSessionFactory.java:30)
    at hibernate.TestClient.createHoney(TestClient.java:44)
    at hibernate.TestClient.main(TestClient.java:26)

what is wrong?

[Riyad Kalla]

You now need to add commons-logging.jar to your project.

[mm2ha]

thanks a lot, I have figured it out. the problem was, that I added the hibernate suppert thorough myeclipse->add hibernate . however, it added all the jars only as text files, so then I had to add all of them into the build path. After that i had to figure out and fix few other things, but now it is working! thanks for help!!

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