On Jun 9, 2006, at 3:26 PM, Lothar Krenzien wrote:
Hi there ,
I'm using the recent Cayenne version with Tomcat 5.5 and Java 5.
Since a few days I get very often a NullPointerException from
cayenne. Analysing the stack trace it seems that the exception is
thrown by Apache's commons collection class LRUMap. I've found a
possible solution at BugZilla:
http://issues.apache.org/bugzilla/show_bug.cgi?id=32573
There it is saied that it could be a synchronising problem. And I'm
getting the exeption only after a while the server is running and
lots of users are connected. Would it be possible to try the
suggestions from BugZilla? There's another post of the same
excption in this group a few days ago. So it seems to be a very
serious problem.
http://www.objectstyle.org/cayenne/lists/cayenne-user/
2006/06/0017.html
Since you and Bryan are seeing the same issue independently, I'd say
this is a real bug. There are mixed reports under the LRUMap Bugzilla
ticket above on whether synchronizing the LRUMap fixes it. In any
event we'll have to deal with it in Cayenne in some way, so I opened
a Jira ticket [1] and will investigate.
What I've just realized that cayenne comes with it's own copy of
common collections packed in the cayenne.jar. For me that seems not
be very usefull. Instead of it I would prefer a link on the cayenne
download page. That way I could independently update cayenne and/
or commons collection.
It is up to you whether to use bundled commons-collections or not.
There are cayenne.jar and cayenne-nodeps.jar [2].
[1] http://issues.apache.org/cayenne/browse/CAY-565
[2] http://objectstyle.org/confluence/display/CAYDOC/JAR+Files+and
+Dependencies
Andrus
