Thanks vtysh, that's true, but LongInstance is a sub-class of VariableInstance. And it does define a value property: | <hibernate-mapping default-access="field"> | <subclass name="org.jbpm.context.exe.variableinstance.LongInstance" | extends="org.jbpm.context.exe.VariableInstance" | discriminator-value="L"> | <property name="value" type="long" column="LONGVALUE_" /> | </subclass> | </hibernate-mapping> | So shouldn't it be calling the subclass value method? Or do I need to alter my query somehow to reference org.jbpm.context.exe.LongInstance? Cheers, Pete. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4063932#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...