Hi ALL

I am beginner to Hibernate and new to this forum.

I just installed Hibernate and everything and wrote first program and got this error.
I have made all the connections before and it seems some compatiblity issue.
Please suggest what should i do and how should i go to get rid of it.

I have Eclipse, Hibernate and Derby.
Hibernate Distribution 3.5 and annotation 3.4.0

I have cofig.hbm.xml and 1 employee class with JPA mappings.
and one TestEmployee class with main ()
when i run this class ,i get the errors.



-----------------------------------------
18:54:24,990 INFO Version:15 - Hibernate Annotations 3.4.0.GA
18:54:25,005 INFO Environment:570 - Hibernate 3.5.4-Final
18:54:25,005 INFO Environment:603 - hibernate.properties not found
18:54:25,021 INFO Environment:781 - Bytecode provider name : javassist
18:54:25,021 INFO Environment:662 - using JDK 1.4 java.sql.Timestamp handling
18:54:25,161 INFO Version:14 - Hibernate Commons Annotations 3.1.0.GA
18:54:25,177 INFO Configuration:1518 - configuring from resource: hibernate.cfg.xml
18:54:25,177 INFO Configuration:1495 - Configuration resource: hibernate.cfg.xml
18:54:25,270 INFO Configuration:1633 - Configured SessionFactory: null
18:54:25,302 INFO Dialect:206 - Using dialect: org.hibernate.dialect.DerbyDialect
Exception in thread "main" java.lang.IncompatibleClassChangeError: class org.hibernate.cfg.ExtendedMappings has interface org.hibernate.cfg.Mappings as super class
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at org.hibernate.cfg.AnnotationConfiguration.createExtendedMappings(AnnotationConfiguration.java:187)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:277)
at org.hibernate.cfg.Configuration.generateDropSchemaScript(Configuration.java:838)
at org.hibernate.tool.hbm2ddl.SchemaExport.<init>(SchemaExport.java:128)
at org.hibernate.tool.hbm2ddl.SchemaExport.<init>(SchemaExport.java:91)
at com.hibernate.chapter01.TestEmployee.main(TestEmployee.java:21)
----------------------------------------------

This is my TestEmployee class----
package com.hibernate.chapter01;
//import javax.persistence.*;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.tool.hbm2ddl.SchemaExport;


public class TestEmployee {
public static void main(String args[])
{

//To call hibernate,use AnnotationConfiguration class in the file

//create am object of AnnotationConfiguration

AnnotationConfiguration ac=new AnnotationConfiguration();
//Add annotated classes in the parameter,classes/entites whose tables need to be created
ac.addAnnotatedClass(Employee.class);

//ac.configure();//default hibernate.config.xml -configation fule
ac.configure("hibernate.cfg.xml");
new SchemaExport(ac).create(true, true);

}
}