NoClassDefFoundError

[Sunder Ganapathy]

I get the above message while using logging in a Hibernate program.

The message is java.lang.NoClassDefFoundError: Could not initialize class
org.hibernate.validator.ClassValidator.

I have all the jar files, namely, ejb3-persistence, hibernate3, hibernate.cfg,
hibernate-annotations, hibernate-commons-annotations, hibernate-entitymanager and hibernate-validator in both classpath and Tomcat lib file.
What could be the reason.

[Cameron Wallace McKenzie]

Classloaders are a mysterious thing.

Which class is using the class that can't be found. Package the jar along with that class, not just on the JVM or Tomcats classpath. Various components have different classloaders and this can trigger just these types of problems.

-Cameron McKenzie

[Sunder Ganapathy]

Thanks Cameron.

When I came to know that validating can also be done using Hibernate,
I started using the same "C:\_hiblib" for this also. I was using Log4j also
in my program . In one of the JBOSS forums, I read that duplicate declarations
cause problems . Now the issue is resolved.