Re: NoClassDefFoundError in service after clicking a button

Disable Google App Engine in your eclipse settings, and remove all GAE jars from your classpath.

GAE doesn't allow you to open socket connections, which is exactly what hibernate is trying to do before it fails.

--Sri

On 26 June 2010 01:15, Ruben <rubenski@gmail.com> wrote:

Hi,

I am running in a NoClassDeffFoundError after clicking a button in my
very basic app. I modified the standard app in Eclipse just a little
bit by adding 1 service method:

1. Created a new GWT project in Eclipse. This gets me the standard
Greeting Service example app - app works
2. I created a User class, which is just a POJO - app works
3. Added a HibernateUtil class for access to Hibernate - app works
4. Added Hibernate JAR to the build path in Eclipse - app works
5. Modified the GreetingServiceImpl by importing
org.hibernate.session, HibernateUtil and User - app works
5. Added the following getUser method to the GreetingServiceImpl - app
breaks!

// Retrieves a user from Hibernate
public User getUser(int userId){
 Session session =
HibernateUtil.getSessionFactory().getCurrentSession();
 session.beginTransaction();
 // Get the User from Hibernate
 User user = (User) session.get(User.class, userId);
 // TODO Translate user to a serializable data transfer object before
returning
 return new User();
}

Whenever I press the Send button in the Greeting Service app I get the
following stacktrace in the Eclipse console:

WARNING: Error for /test/greet
java.lang.NoClassDefFoundError: org/hibernate/Session
       at java.lang.Class.getDeclaredConstructors0(Native Method)
       at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
       at java.lang.Class.getConstructor0(Class.java:2699)
       at java.lang.Class.newInstance0(Class.java:326)
       at java.lang.Class.newInstance(Class.java:308)
       at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)


Do  you know why this happens? The getUser() method that seems to be
responsible is not even called. And I imported the
org.hibernate.Session class and it's on the Eclipse build bath.


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