Hibernate version:2.1

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

<session-factory name="java:hibernate/HibernateFactory">

<property name="connection.datasource">java:comp/env/oozlooz/hibernate</property>
<property name="show_sql">true</property>



<!-- Settings for a remote MySQL database. -->
<property name="dialect">net.sf.hibernate.dialect.MySQLDialect</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">mysql://localhost/oozlooz</property>
<property name="connection.username">oozlooz</property>
<property name="connection.password">Jerich0</property>

<!-- Use the C3P0 connection pool. -->
<property name="c3p0.min_size">3</property>
<property name="c3p0.max_size">5</property>
<property name="c3p0.timeout">1800</property>

<!-- Use EHCache but not the query cache. -->
<property name="cache.provider_class">net.sf.ehcache.hibernate.Provider</property>
<property name="cache.use_query_cache">false</property>
<property name="cache.use_minimal_puts">false</property>

<mapping resource="oozlooz/hbm/user.hbm.xml"/>

</session-factory>
</hibernate-configuration>

Code between sessionFactory.openSession() and session.close():Session sess=HibernateUtil.currentSession();
tx=sess.beginTransaction();

//Get the user class object referring to the table "user"
user uObj = new user();
//Create the query
Query query=sess.createQuery("SELECT count(userid) FROM user where username= :username");
query.setString("username",username);

//Iterate thorugh the result of this query.
//If it contains > 0 records, there is already a user registered
int userCount=0;
for( Iterator it=query.iterate() ; it.hasNext(); ){
userCount++;
}
if(userCount > 0) //User already Exists.
{
errors.add("user.exists", new ActionError("joinus.user.exists", username));
}

}catch(Exception e){
try{
e.printStackTrace();
if(tx!=null){ tx.rollback(); }
}catch(HibernateException he ){
he.printStackTrace();
}
}finally{
try{
HibernateUtil.closeSession();
}catch(HibernateException he ){
he.printStackTrace();
}

Full stack trace of any exception that occurs:2004-09-04 15:45:53 StandardWrapperValve[action]: Servlet.service() for servlet action threw exception
java.lang.NoClassDefFoundError
at oozlooz.forms.JoinForm.validate(JoinForm.java:71)
at org.apache.struts.action.RequestProcessor.processValidate(RequestProcessor.java:942)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:255)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:793)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:702)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:571)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:644)
at java.lang.Thread.run(Thread.java:536)


Name and version of the database you are using:mysql-4

Debug level Hibernate log excerpt:-

--This is a very basic implementation of Hibernate that I am trying to do. I hve initialized context in Tomcat 5 server.xml and web.xml and copied the HibernateUtil.java code from example. I cant understand what is wrong with this.
Please show me the way !

Make sure you use the latest HibernateUtil.java code from the documentation.