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From "roger.keays" <roger.ke...@ninthavenue.com.au>
Subject another shared classloader problem
Date Tue, 17 Apr 2007 00:27:02 GMT

Hi all,

I've come across another defect since moving openjpa to tomcat's shared/lib
shared classloader. Unfortunately, try as I might, I can't reliably
reproduce this one, so I'm posting the problem here in the hope that
somebody might be able to offer some suggestions.

The problem is that one of my entity classes seems to forget its name under
certain situations. I have two entities: figbird.commerce.entities.Product,
and gemstone.business.entities.Product. The former is mapped to the entity
name 'FigbirdProduct' in the XML metadata and the latter defaults to
'Product'. The error message I see is:

WARNING: An error occurred while parsing the query filter "SELECT i FROM
Product i WHERE i.code = :c". Error message: No field named "code" in class
"class figbird.commerce.entities.Product".
<4|false|0.9.6-incubating> org.apache.openjpa.persistence.ArgumentException:
An error occurred while parsing the query filter "SELECT i FROM Product i
WHERE i.code = :c". Error message: No field named "code" in class "class
figbird.commerce.entities.Product".

of course the field 'code' is on gemstone.b.e.Product (not
figbird.c.e.Product)

I would rename one of my classes and let it rest if it wasn't for the fact
that worked fine with the webapp classloader, and only seems to break when
some condition occurs. I've tried reproducing by

 * loading the server and forcing garbage collections
 * setting the DataCache and QueryCache size to 1, with 0 soft references
 * disabling the DataCache and QueryCache
 * restarting other webapps which use both entities

but to no avail. Once this exception occurs, restarting the webapp doesn't
resolve it. The whole server has to be restarted.

Any suggestions are welcome. I'm using 0.9.6.

Roger
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