Hi,
Schmidt wrote:
Hi again Armin,
I saw some discussions regarding the AbstractIndirectionHandler class, maybe
the method "public Object invoke" is outdated in the OJB version in use by
me. I'm using OJB1.0.4 and the jar file date is 31/12/2005. Is that correct?
yep!
Is there any other version available? If so, please point me out where can I
get it.
Thank you!
You can test the upcoming 1.0.5 version. The 1.0.5rc1 is stable but
contain some specific query bugs. Details see this thread:
http://www.mail-archive.com/ojb-user%40db.apache.org/msg16078.html
regards,
Armin
Schmidt wrote:
Hi Armin,
Thank you for the answer.
I'm using the 1.0.4 version. And the same problem happens with 1:n
associations as well. In the 1:n associations I set auto-retrieve="false"
and proxy="dynamic". As my classes do not implement interfaces, I'm using
CGLib as ProxyFactoryClass.
I debugged the source code and verified that the collection representing
the n side of the 1:n association is filled with proxy references. That's
good because the real object are not materialized, but when I check for
nullity, the result is false due to proxy references. The solution (ugly)
to bypass this problem is in the ProxyHelper.getRealObject method. But
this solution is invasive, proxies should be transparent.
Another problem that came up after I started using proxies is in the
hierarchy mapping. I'm using just one table to map my class hierarchy. So,
this table has a CLASSNAME field to identify which class to load. In the
constructor of my base class I have a
setOjbConcreteClass(this.getClass().getName()) call. Before using proxies,
the class name was configured correctly. But after, instead of having the
real object class name, the application configures the classname field
using the proxy class name.
I assume there should be something wrong with my mapping files or some
other point in my application. As said earlier, I believe proxies should
be transparent. Did someone here experience the same problems?
Thank you again!
Armin Waibel wrote:
Hi,
Schmidt wrote:
Hi,
Consider that an object A has an association with an object B. Also that
dynamic proxies are in use so that when object A is loaded, a proxy to B
is
created and the object B itself is not materialized. Sometimes, before
taking an action, I need to verify if there is a B object associated to
A.
This check is done as follows:
if (a.getB() == null) {...}
The problem is that even if there isn't a B associated with A, OJB
returns
false because there is always a proxy between A and B. The check is
actually
done using the proxy reference which is always present.
How can we handle that?
Which version of OJB do you use? I try to reproduce this with the
current source (OJB_1_0_RELEASE branch) without success. If class
Article has a 1:1 relation to ProductGroup and I search for an Article
without a ProductGroup I get:
Criteria c = new Criteria().addEqualTo("articleName", name + "without
PG");
q = QueryFactory.newQuery(ArticleWithReferenceProxy.class, c);
Article br = (ArticleWithReferenceProxy) broker.getObjectByQuery(q);
assertNotNull(br);
assertNull(br.getProductGroup());
Could it be that the association between A and B is a 1:n relation?
regards,
Armin
Thank in advance!
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