[jboss-user] [JBoss jBPM] - subclassing TaskInstance and setting up hibernate mapping fo

[rossputin]

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



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