Hi all i am using JBoss 4.0.2 with following configuration

commons-collections-2.1.1.jar is put at
jboss\server\default\deploy\jboss-hibernate.deployer


jboss\server\default\deploy\hibernate-service.xml

<?xml version="1.0" encoding="UTF-8"?>

<!-- $Id$ -->

<!-- ===================================================================== -->
<!-- -->
<!-- Hibernate Service Configuration -->
<!-- -->
<!-- ===================================================================== -->

<server>
 <mbean code="org.jboss.hibernate.jmx.Hibernate"
 name="jboss.har:service=Hibernate">
 <attribute name="DatasourceName">java:/MSSQLDS</attribute>
 <attribute name="Dialect">org.hibernate.dialect.SQLServerDialect</attribute>
 <attribute name="SessionFactoryName">java:/hibernate/SessionFactory</attribute>
 <attribute name="CacheProviderClass">
 org.hibernate.cache.HashtableCacheProvider
 </attribute>
 <!-- <attribute name="Hbm2ddlAuto">create-drop</attribute> -->
 </mbean>
</server>

10:51:54,203 INFO [Hibernate] Using JDBC batch size : null
10:51:54,218 ERROR [Hibernate] Starting failed jboss.har:service=Hibernate
java.lang.NullPointerException
 at org.jboss.hibernate.jmx.Hibernate.buildSessionFactory(Hibernate.java:
595)
 at org.jboss.hibernate.jmx.Hibernate.startService(Hibernate.java:578)
 at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanS
upport.java:272)
 at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMB
eanSupport.java:222)
 at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatch
er.java:141)
 at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
 at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.
java:249)
 at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
 at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceControl
ler.java:897)