I have exactly the same error and as Florent I started to install with MySQL then go back to HSQL. I had to edit hibernate.cfg.xml to change the dialect to org.hibernate.dialect.HSQLDialect and my -ds.xml is as follows : <?xml version="1.0" encoding="UTF-8"?> | <datasources> | | <local-tx-datasource> | <jndi-name>JbpmDS</jndi-name> | | <connection-url>jdbc:hsqldb:${jboss.server.data.dir}${/}hypersonic${/}jbpmDB</connection-url> | <driver-class>org.hsqldb.jdbcDriver</driver-class> | <user-name>sa</user-name> | <password></password> | | <!-- connection pool parameters --> | <min-pool-size>1</min-pool-size> | <max-pool-size>5</max-pool-size> | | <!-- disable idle connection removal, hsqldb does not reap threads on closed connections --> | <idle-timeout-minutes>0</idle-timeout-minutes> | <!-- check all statements are closed when the connection is returned to the pool --> | <track-statements /> | <!-- hsqldb benefits from prepared statement caching --> | <prepared-statement-cache-size>32</prepared-statement-cache-size> | | <!-- corresponding type-mapping in conf/standardjbosscmp-jdbc.xml --> | <metadata> | <type-mapping>Hypersonic SQL</type-mapping> | </metadata> | | <!-- ensure the datasource is not initialized before the database itself --> | <depends>jboss:service=Hypersonic,database=jbpmDB</depends> | </local-tx-datasource> | | <mbean code="org.jboss.jdbc.HypersonicDatabase" name="jboss:service=Hypersonic,database=jbpmDB"> | <attribute name="Database">jbpmDB</attribute> | <attribute name="InProcessMode">true</attribute> | </mbean> | | </datasources> | Anything else to do ? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4200505#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...