I'm having exactly the same problem that singular_droid had in this post:
http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3876764#3876764
I'm developing an application that works perfectly on JBoss 4.0.1, but when I try to deploy it on JBoss 4.0.2, I get the following error:
12:49:08,520 WARN [ServiceController] Problem starting service jboss.har:service=Hibernate java.lang.NoClassDefFoundError: org/apache/commons/collections/SequencedHashMap
<server> <mbean code="org.jboss.hibernate.jmx.Hibernate" name="jboss.har:service=Hibernate"> <attribute name="DatasourceName">java:/esport</attribute> <attribute name="Dialect">net.sf.hibernate.dialect.MySQLDialect</attribute> <attribute name="SessionFactoryName">java:/hibernate/eSportSessionFactory</attribute> <attribute name="CacheProviderClass"> net.sf.hibernate.cache.HashtableCacheProvider </attribute> <attribute name="ShowSqlEnabled">true</attribute> <!-- <attribute name="Hbm2ddlAuto">create-drop</attribute> --> </mbean> </server>
commons-collections jar can be found in:
http://jakarta.apache.org/commons/collections/