RE: Advanced OR_Mapping 1-to-N-to-N possible?

[Dvornikov Victor]

Hi, Lachezar, 
you always have a workable alternative - just to turn your object instance
into byte array . This is the first step I recommend while doing  1-M
OR-mapping. Then I try to figure out how "deep" my <map-mapping> should be.
Because it is a lot of "dirty" error-prone work on your 'orion-ejb-jar'
files. I mean admitting that the final solution may be a mix of OR-mapping
and serialization. Don't disregard the latter. I use cloudscape ORDMS where
implicit java-object serialization is supported.  Again I didn't encounter
any problem with orion or-mapping, although my experience is limited.  

Regards, Victor


        -----Original Message-----
        From:   Lachezar Dobrev [SMTP:[EMAIL PROTECTED]]
        Sent:   ? 04 ???? 2001 10:36
        To:     Orion-Interest
        Subject:        Advanced OR_Mapping 1-to-N-to-N possible?

          I have this situation:

           class Enterprise1Bean implements EntityBean {
             public java.util.Vector elements;
             public static final Class elements_type =
Normal_Java_Bean1.class;

             public void setElements(java.util.Vector newElements){
               elements = newElements;
             }
             public java.util.Vector getElements(){
               return elements;
             }

             /*********************
              * Other EJB methods *
              *********************/
           }

           class Normal_Java_Bean1 {
             public java.util.Vector elements;
             public static final Class elements_type =
Normal_Java_Bean2.class;

             public void setElements(java.util.Vector newElements){
               elements = newElements;
             }
             public java.util.Vector getElements(){
               return elements;
             }
           }

           class Normal_Java_Bean2 {
             public String text;

             public void setText(String newText){
               text = newText;
             }
             public String getText(){
               return text;
             }
           }


           Now I want to map everything in an 1-to-N-to-N or-mapping.
           That means... What you see... An EJB has a Vector of elements,
which have
        other Vectors of other Elements.

           Trying to deploy that I receive a NullPointerException ( I think
it's
        while creating the table for the Normal_Java_Bean2, beacause
        Normal_Java_Bean1 has no primary key to map into).

           Tried Map-Mapping, because there is a primary key, to no avail
however:

           <map-mapping> can only be used on the types java.util.Map,
        java.util.Hashtable, java.util.Properties (not Normal_Java_Bean1)


           HELP!

           Lachezar