[castor-dev] HELP: Collection mapping problems

[Simon Harris]

Here is my mapping file:       <class name="com.thoughtworks.asexchange.jdo.Login" identity="loginId">         <description>Login</description>         <map-to table="login" />         <field name="loginId" type="string">             <sql name="loginid" />         </field>         <field name="password" type="string">             <sql name="password" />         </field>         <field name="roles" type="string" collection="set" required="true">             <sql many-table="LoginRole" many-key="loginId" name="roleName" />         </field>     </class>   when I run I get the following error:   java.lang.NullPointerException at org.exolab.castor.persist.ClassMolder.<init>(ClassMolder.java:353) at org.exolab.castor.persist.ClassMolder.resolve(ClassMolder.java:513) at org.exolab.castor.persist.LockEngine.<init>(LockEngine.java:168) at org.exolab.castor.persist.PersistenceEngineFactory.createEngine(PersistenceEngineFactory.java:83) at org.exolab.castor.jdo.engine.DatabaseRegistry.(DatabaseRegistry.java:204) at org.exolab.castor.jdo.engine.DatabaseRegistry.(DatabaseRegistry.java:184) at org.exolab.castor.jdo.engine.DatabaseRegistry.loadDatabase(DatabaseRegistry.java:317) at org.exolab.castor.jdo.JDO.getDatabase(JDO.java:538) ...   If I comment out the collection mapping, the application runs just fine.   Regards,   Simon