i forgot to update eclipse project classpath. it's fixed now.
it seems i forgot to report the 3 things i updated to fix the webapp:
* reverted to the jboss commons-logging to prevent NoClassDefFoundException when service archive was deployed in jboss
* removed the version from the jbpm service archive package.
* reverted to plain JDBC transactions instead of CMT transactions by removing the configuration lines
<property name="hibernate.transaction.factory_class">org.hibernate.transaction.CMTTransactionFactory</property> <property name="hibernate.transaction.manager_lookup_class">org.hibernate.transaction.JBossTransactionManagerLookup</property>]]>
from the service archive configurations in the build.xml