Hi guys, as per the CustomTaskInstance example, I am subclassing TaskInstance, and adding a couple of simple properties, I have created a new class subclassing TaskInstance, and the hibernate mapping field to go with it... What I am unsure about, is how the hibernate mapping file relates to my MySQL database, do I need to modify the original TaskInstance table in MySQL to reflect the changes (fields added) in my new extended class, or do I create a new table JBPM_NEWTASKINSTANCE that is a duplicate of JBPM_TASKINSTANCE table but with the new fields added. My hibernate mapping file is listed below... | <?xml version="1.0"?> | | <!DOCTYPE hibernate-mapping PUBLIC | "-//Hibernate/Hibernate Mapping DTD 3.0//EN" | "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> | | <hibernate-mapping default-access="field"> | | <subclass name="com.mycomp.taskinstance.NewTaskInstance" | extends="org.jbpm.taskmgmt.exe.TaskInstance" | discriminator-value="C"> | | <property name="someVariable1" column="SOMEVARIABLE1_" /> | | </subclass> | | </hibernate-mapping> | When I run my unit test I see... | INFO Configuration : Reading mappings from resource : com/mycomp/taskinstance/NewTaskInstance.hbm.xml | | INFO HbmBinder : Mapping subclass: com.mycomp.taskinstance.NewTaskInstance -> JBPM_TASKINSTANCE | I suppose the NewTaskInstance should map to either a modified JBPM_TASKINSTANCE or to JBPM_NEWTASKINSTANCE ? And finally of course the test bombs out with... | WARN JDBCExceptionReporter : SQL Error: 1054, SQLState: 42S22 | ERROR JDBCExceptionReporter : Unknown column 'newtaskins0_.SOMEVARIABLE1_' in 'field list' | because I either have not added the new field to JBPM_TASKINSTANCE, or have not added the new table required.. (not sure which). If someone could give me a pointer as to the process of adding the new field in the table, or adding a new table I would appreciate it, thanks Ross View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4088456#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...