EJB bidirectional relations

[Former Member]

Like in this manual

http://help.sap.com/saphelp_nw04/helpdata/de/76/c6ba3eb645dc61e10000000a114084/content.htm

i tried to map EJB-Fields from different EJBs to an existing dictionary. Inside the ejb-jar.xml was the following text:

<i> <relationships>

<ejb-relation>

<description>description</description>

<ejb-relation-name>CatDatRelation</ejb-relation-name>

<ejb-relationship-role>

<ejb-relationship-role-name>com.eonis.test.CategoryBean</ejb-relationship-role-name>

<multiplicity>Many</multiplicity>

<relationship-role-source>

<ejb-name>CategoryBean</ejb-name>

</relationship-role-source>

<cmr-field>

<cmr-field-name>catDatRel</cmr-field-name>

<cmr-field-type>java.util.Set</cmr-field-type>

</cmr-field>

</ejb-relationship-role>

<ejb-relationship-role>

<ejb-relationship-role-name>com.eonis.test.DataBean</ejb-relationship-role-name>

<multiplicity>Many</multiplicity>

<relationship-role-source>

<ejb-name>DataBean</ejb-name>

</relationship-role-source>

</ejb-relationship-role>

</ejb-relation>

</relationships></i>

How do I the many-to-many-relationship? My Guess was:

<i> <relationships>

<ejb-relation>

<description>description</description>

<ejb-relation-name>CatDatRelation</ejb-relation-name>

<ejb-relationship-role>

<ejb-relationship-role-name>com.eonis.test.CategoryBean</ejb-relationship-role-name>

<multiplicity>Many</multiplicity>

<relationship-role-source>

<ejb-name>CategoryBean</ejb-name>

</relationship-role-source>

<cmr-field>

<cmr-field-name>catDatRel</cmr-field-name>

<cmr-field-type>java.util.Set</cmr-field-type>

</cmr-field>

<cmr-field>

<cmr-field-name>DatCatRel</cmr-field-name>

<cmr-field-type>java.util.Set</cmr-field-type>

</cmr-field>

</ejb-relationship-role>

<ejb-relationship-role>

<ejb-relationship-role-name>com.eonis.test.DataBean</ejb-relationship-role-name>

<multiplicity>Many</multiplicity>

<relationship-role-source>

<ejb-name>DataBean</ejb-name>

</relationship-role-source>

</ejb-relationship-role>

</ejb-relation>

</relationships></i>

It didn't work. Can anybody help me, please?

[Vlado · Accepted solution]

Hi Richard,

You can only have 0 or 1 cmr-field per ejb-relationship-role. So to make the relationship bidirectional, the second cmr-field should be in the second ejb-relationship-role:

<i><relationships>

<ejb-relation>

<description>description</description>

<ejb-relation-name>CatDatRelation</ejb-relation-name>

<ejb-relationship-role>

<ejb-relationship-role-name>com.eonis.test.CategoryBean</ejb-relationship-role-name>

<multiplicity>Many</multiplicity>

<relationship-role-source>

<ejb-name>CategoryBean</ejb-name>

</relationship-role-source>

<cmr-field>

<cmr-field-name>catDatRel</cmr-field-name>

<cmr-field-type>java.util.Set</cmr-field-type>

</cmr-field>

</ejb-relationship-role>

<ejb-relationship-role>

<ejb-relationship-role-name>com.eonis.test.DataBean</ejb-relationship-role-name>

<multiplicity>Many</multiplicity>

<relationship-role-source>

<ejb-name>DataBean</ejb-name>

</relationship-role-source>

<b><cmr-field>

<cmr-field-name>DatCatRel</cmr-field-name>

<cmr-field-type>java.util.Set</cmr-field-type>

</cmr-field></b>

</ejb-relationship-role>

</ejb-relation>

</relationships></i>

Hope that helps,

Vladimir