CMR and Local Interfaces

Question

I have a question on setting up CMR in an environment where I want to utilize local
interfaces within a weblogic server instance. In the deployment descriptor, I have
set up the home, remote, local-home, local, and ejb-class entries. I then want to
define the relationships between two CMP entity beans. Here is where I run into
problems.
1) If I define the CMR field using the local interface, I get an error stating that
the type defined by the bean for the field does not match that of the remote interface.
2) If I define the CMR field using the remote interface, I get an error stating that
the bean must use the local interface for the CMR if one exists.
Seems kind of circular to me. What am I missing?

Answer 1

If you want to be able to have mutiple children companies for a parent
company and you want to be able to query for the parent company for a given
comapnay then this is the XML I would do something like the following. In
your xml you had the mutiplicities inverted and also the cmr field was
either in the wrong place or misnamed (ie, if it had to be in the top block
then it should have been "childCompanies" instead of "parentCompany").
Assuming the bean name in the descriptor for the CompanyEJB is Company:
<ejb-relation>
<ejb-relation-name>Company-ParentCompany</ejb-relation-name>
<ejb-relationship-role>
<ejb-relationship-role-name>Company-Has-ChildCompanies</ejb-relationship-rol
e-name>
<multiplicity>one</multiplicity>
<relationship-role-source>
<ejb-name>Company</ejb-name>
</relationship-role-source>
</ejb-relationship-role>
<ejb-relationship-role>
<ejb-relationship-role-name>Company-Has-ParentCompany</ejb-relationship-role
-name>
<multiplicity>many</multiplicity>
<relationship-role-source>
<ejb-name>Company</ejb-name>
</relationship-role-source>
<cmr-field>
<cmr-field-name>parentCompany</cmr-field-name>
</cmr-field>
</ejb-relationship-role>
</ejb-relation>
In the CompanyEJB you would have:
public abstract CompanyLocal getParentCompany();
public abstract void setParentCompany( CompanyLocal parent );
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>
The jar I am running through ejbc is attached (with source). The EJBobject naming
conventions are as follows:
ejb-class = CompanyEJB
home = CompanyHome
remote = Company
local-home = CompanyLocalHome
local = CompanyLocal
The pertinent ejb-jar snippet:
<ejb-relation>
<ejb-relation-name>Company-ParentCompany</ejb-relation-name>
<ejb-relationship-role>
<ejb-relationship-role-name>Company-Has-ChildCompanies</ejb-relationship-rol
e-name>
<multiplicity>Many</multiplicity>
<relationship-role-source>
<ejb-name>Company</ejb-name>
</relationship-role-source>
<cmr-field>
<cmr-field-name>parentCompany</cmr-field-name>
</cmr-field>
</ejb-relationship-role>
<ejb-relationship-role>
<ejb-relationship-role-name>Company-Has-ParentCompany</ejb-relationship-role
-name>
<multiplicity>One</multiplicity>
<relationship-role-source>
<ejb-name>Company</ejb-name>
</relationship-role-source>
</ejb-relationship-role>
</ejb-relation>
And the weblogic-cmp-rdbms-jar snippet:
<weblogic-rdbms-relation>
<relation-name>Company-ParentCompany</relation-name>
<weblogic-relationship-role>
<relationship-role-name>Company-Has-ParentCompany</relationship-role-name>
</weblogic-relationship-role>
<weblogic-relationship-role>
<relationship-role-name>Company-Has-ChildCompanies</relationship-role-name>
<column-map>
<foreign-key-column>PRNT_COMP_ID</foreign-key-column>
<key-column>COMP_ID</key-column>
</column-map>
</weblogic-relationship-role>
</weblogic-rdbms-relation>
In the CompanyEJB, these are the two scenarios I tried:
1)
public abstract Company getParentCompany();
public abstract void setParentCompany( Company prnt );
2)
public abstract CompanyLocal getParentCompany();
public abstract void setParentCompany( CompanyLocal prnt );
The only way I have been able to get it to work so far is to use thesyntax in #1
above and then to remove all references to the local interfaces in thedeployment
descriptors.
Thanks for all help