Hi, yes, i am using pb. Setting auto-retrieve="true" in the collection-descriptor has not the desired effect, I still get the following two strange error messages:
within browser it shows a null pointer execption for Venture when it tried to retrieve all venture objects associated with activity and in the tomcat console I get a SQL Exception for class PERSON, state that activityId is not valid in the context where it is used (db2 database error message). When I set auto-retrieve="false" for PERSON in the reference-descriptor of class ACTIVITY, the venture objects are retrieved. no error message. everything works fine, except - of course I have no person objects then. any idea? Dirk -----Ursprüngliche Nachricht----- Von: Brian McCallister [mailto:[EMAIL PROTECTED] Gesendet: Mittwoch, 14. Januar 2004 15:13 An: OJB Users List Betreff: Re: Two 1:N mappings to one table Mapping to 1:N's to the same table is fine, heack mapping 1:N's form one class to itself multiple times works fine. From looking at your configs I will venture that you are using the PB API and one of the collections isn't loading -- try setting auto-retrieve on the collections, or (these are exclusive) try using the ODMG API (which will retrieve them automagically) -Brian On Jan 13, 2004, at 7:58 PM, Dirk Manske wrote: > Hi, > > how can I map two tables with each having a 1:N relation to the same > table? > I always get a null pointer exception for class Person. > > I have three tables: > > PERSON with a 1:N relation to ACTIVITY > > and > > VENTURE with a 1:N relation to ACTIVITY > > Table PERSON and VENTURE both references activityId from table > ACTIVITY. In the repository-user.xml for each table which relates to > ACTIVITY the collection-descriptor is setup > > for table VENTURE: > > <collection-descriptor > name="allAssignedActivities" > element-class-ref="de.plato.Activity" > orderBy="activityId" > sort="DESC" > auto-update="true" > > <inverse-foreignkey field-ref="ventureId" /> </collection-descriptor> > > and for table PERSON: > > <collection-descriptor > name="allAssignedActivities" > element-class-ref="de.plato.Activity" > orderBy="activityId" > sort="DESC" > auto-update="true" > > <inverse-foreignkey field-ref="personId" /> </collection-descriptor> > > for ACTIVITY, both tables are referenced: > > <reference-descriptor name="person"> > class-ref="de.plato.Person" > refresh="true" > auto-retrieve="true"> > <foreign-key field-ref="personId" /> > > and > > <reference-descriptor name="venture"> > class-ref="de.plato.Venture" > refresh="true" > auto-retrieve="true"> > <foreign-key field-ref="ventureId" /> > > Unfortunately, this does not work. What do I have to do? > > thx, > Dirk > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
