Hi,

I am trying to complete the first tutorial of the book "Java Persistance with Hibarnate" but i get the following error when i do ant run:

Exception in thread "main" java.lang.ExceptionInInitializerError
[java] at persistence.HibernateUtil.<clinit>(Unknown Source)
[java] at hello.HelloWorld.main(Unknown Source)
[java] Caused by: java.lang.NoClassDefFoundError: com/mchange/v2/c3p0/DataSources
[java] at org.hibernate.connection.C3P0ConnectionProvider.configure(C3P0ConnectionProvider.java:154)
[java] at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:124)
[java] at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:56)
[java] at org.hibernate.cfg.SettingsFactory.createConnectionProvider(SettingsFactory.java:414)
[java] at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:62)
[java] at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2073)
[java] at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1298)
[java] ... 2 more
[java] Caused by: java.lang.ClassNotFoundException: com.mchange.v2.c3p0.DataSources
[java] at java.net.URLClassLoader$1.run(Unknown Source)
[java] at java.security.AccessController.doPrivileged(Native Method)
[java] at java.net.URLClassLoader.findClass(Unknown Source)
[java] at java.lang.ClassLoader.loadClass(Unknown Source)
[java] at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
[java] at java.lang.ClassLoader.loadClass(Unknown Source)
[java] at java.lang.ClassLoader.loadClassInternal(Unknown Source)
[java] ... 9 more
[java] Java Result: 1
**********************************************************
Hibernate version: 3.0

Mapping documents:

Code between sessionFactory.openSession() and session.close():
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction tx = session.beginTransaction();
Message message = new Message("Hello World");
Long msgId = (Long) session.save(message);
tx.commit();
session.close();
// Second unit of work
Session newSession = HibernateUtil.getSessionFactory().openSession();
Transaction newTransaction = newSession.beginTransaction();
List messages = newSession.createQuery(
"from Message m order by m.text asc").list();
System.out.println(messages.size() + " message(s) found:");
for (Iterator iter = messages.iterator(); iter.hasNext();) {
Message loadedMsg = (Message) iter.next();
System.out.println(loadedMsg.getText());
}
newTransaction.commit();
newSession.close();


Full stack trace of any exception that occurs:
Exception in thread "main" java.lang.ExceptionInInitializerError
[java] at persistence.HibernateUtil.<clinit>(Unknown Source)
[java] at hello.HelloWorld.main(Unknown Source)
[java] Caused by: java.lang.NoClassDefFoundError: com/mchange/v2/c3p0/DataSources
[java] at org.hibernate.connection.C3P0ConnectionProvider.configure(C3P0ConnectionProvider.java:154)
[java] at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:124)
[java] at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:56)
[java] at org.hibernate.cfg.SettingsFactory.createConnectionProvider(SettingsFactory.java:414)
[java] at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:62)
[java] at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2073)
[java] at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1298)
[java] ... 2 more
[java] Caused by: java.lang.ClassNotFoundException: com.mchange.v2.c3p0.DataSources
[java] at java.net.URLClassLoader$1.run(Unknown Source)
[java] at java.security.AccessController.doPrivileged(Native Method)
[java] at java.net.URLClassLoader.findClass(Unknown Source)
[java] at java.lang.ClassLoader.loadClass(Unknown Source)
[java] at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
[java] at java.lang.ClassLoader.loadClass(Unknown Source)
[java] at java.lang.ClassLoader.loadClassInternal(Unknown Source)
[java] ... 9 more
[java] Java Result: 1


Database used: hsqldb
My hibernate.cfg.xml file is as follows:

package hello;

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration SYSTEM
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class"> org.hsqldb.jdbcDriver </property>
<property name="hibernate.connection.url"> jdbc:hsqldb:hsql://localhost </property>
<property name="hibernate.connection.username"> sa </property>
<property name="connection.password"></property>
<property name="hibernate.dialect"> org.hibernate.dialect.HSQLDialect </property>
<!-- Use the C3P0 connection pool provider -->
<property name="hibernate.c3p0.min_size">5</property>
<property name="hibernate.c3p0.max_size">20</property>
<property name="hibernate.c3p0.timeout">300</property>
<property name="hibernate.c3p0.max_statements">50</property>
<property name="hibernate.c3p0.idle_test_period">3000</property>
<!-- Show and print nice SQL on stdout -->
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<!-- List of XML mapping files -->
<mapping resource="hello/Message.hbm.xml" />
</session-factory>
</hibernate-configuration>


Any help appreciated,
Thanks in advance,
giannis

This usually means that the DataSouces.class is NOT in your classpath. The issue seems to be that either there is a JAR not in your classpath with this class or the class is not in your classpath. Are you using ant or some build system? If so, check your classpath carefully as the ANT classpath is not used for your applications classpath. I would have it print out your classpath in your build tool if your using one. Otherwise echo $CLASSPATH on a *nix box or echo %CLASSPATH% on windows. This should tell you what is in your classpath, if you dont see your jar file containing this class or your CLASS basedir then it is NOT on your classpath. Fix that and re-run.

I am using Tomcat 6 (apache-tomcat-6.0.18)
Encountered the same issue.
I placed c3p0-0.9.1.jar in $CATALINA_HOME/endorsed directory
This issue was gone.


Phoneynk

Caused by: java.lang.ClassNotFoundException: com.mchange.v2.c3p0.DataSources


the verbose error info is not always horrible.be careful,may be you can catch the bug yourself .