I have an application that has various reference data classes. For the most
part, the reference data classes are very similar, so I have a class
structure of (for example).
AuditedObject
^
|
ReferenceData
^ ^
| |
Availability CallType
The availability and call type entity beans live in their own database
tables, using EJB 2.0 persistence.
Since all these beans are very similar, I would like to provide an abstract
interface to my operations beans for general tasks like getting a list of
reference data items, and so on. That way, I could name the class of
reference data that I want and use an ejb-ref to get the appropriate home
interface. Something like:
/**
* @ejb.ejb-ref
* ejb-name="Availability"
* view-type="local"
* ref-name="ejb/Availability"
*/
public ReferenceData getReferenceData(String bean, String id) {
InitialContext ctx = new InitialContext();
ReferenceDataHome home = ctx.lookup("java:comp/env/ejb/" + bean);
return home.findById(id);
}
To do this, I put
/**
* @ejb.finder
* signature="org.charvolant.callout.referencedata.ReferenceData
findById(java.lang.String id)"
* unchecked="true"
*/
in the ReferenceDataBean.java file and
/**
* @ejb.finder
* signature="org.charvolant.callout.referencedata.ReferenceData
findById(java.lang.String id)"
* unchecked="true"
* query="select object(b) from Availability b where b.idField = ?1"
*/
in the Availability.java file. Which I would have thought would have
generated me suitably consistent method signatures and an appropriate finder
for .
However, the 1.2beta3 XDoclet-generated AvailabilityHome.java always
contains the signature
public org.charvolant.callout.referencedata.Availability
findById(java.lang.String id)
throws javax.ejb.FinderException;
which causes a type clash with the generated ReferenceDataHome.java, which
contains
public org.charvolant.callout.referencedata.ReferenceData
findById(java.lang.String id)
throws javax.ejb.FinderException;
I can work around this by having a big pile of if-then-elses. But it's ugly
and seems to fly in the face of good design. Have I missed some subtlety of
the EJB spec or XDoclet?
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