Hi,
I've come across a bit of a problem. I'm not sure it's got anything to
do with ojb, it's more likely to be my sloppy coding! However, the
problem only occurs if I proxy a particular reference.
I've got a type : Meeting (and interface IMeeting).
It has three subtypes: Appraisal, Review, and Synopsis. (ignore the
latter).
Their interfaces are similarly named by start with I. The interfaces
inherit from IMeeting, and do the classes.
As a part of Review, I am trying to build a list of previous reviews,
and their originating Appraisal. This is done through Review's method
"IMeeting getPreviousMeeting()". (note it's proxied)
public List getPreviousMeetings() {
try {
ArrayList previousList = new ArrayList();
IMeeting m = this;
previousList.add((IReview) m);
while (m.getType() == Meeting.REVIEW) {
IReview r = (IReview) m;
m = r.getPreviousMeeting();
if (m.getType() == Meeting.REVIEW) {
previousList.add((IReview) m);
}
else{
//previousList.add((IAppraisal) m);
}
System.out.println("adding");
}
return previousList;
} catch (Exception ex) {
System.out.println("adding review caused error");
ex.printStackTrace();
return new ArrayList();
}
}
If I run the method as above, it works fine, but doesn't include the
original appraisal in the list.
If I uncomment the line with "//previousList.add((IAppraisal) m);" it
causes an error:
java.lang.ClassCastException
at com.netcase.pdp.bo.Review.getPreviousMeetings(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at
org.apache.commons.beanutils.PropertyUtils.getSimpleProperty(PropertyUti
ls.java:1185)
at
org.apache.commons.beanutils.PropertyUtils.getNestedProperty(PropertyUti
ls.java:772)
at
org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.jav
a:801)
at
org.apache.struts.util.RequestUtils.lookup(RequestUtils.java:952)
at
org.apache.struts.taglib.logic.IterateTag.doStartTag(IterateTag.java:277
)
at org.apache.jsp.review_jsp._jspService(review_jsp.java:578)
..
The repository is set up as:
<field-descriptor name="previousMeetingId"
column="previousMeetingId" jdbc-type="INTEGER"/>
<reference-descriptor name="previousMeeting"
class-ref="com.netcase.pdp.bo.Meeting" proxy="true">
<foreignkey field-ref="previousMeetingId"/>
</reference-descriptor>
If I change to repository to proxy="false" to not proxy the object, it
works fine! (but this is a considerable performance implication as it
very rarely uses this reference).
Any help would be greatly appreciated!
Thanks,
Daniel Perry.
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