Hi Tore,
the exception occured very often for me in the get/post method of a servlet.
After days of searching I found out that I created a new cayenne context for
every requests and assigned it to a static variable. And because all other
methods used this static variable, which was changed in the meantime by another
request, I got the exception. After creating a new context in every post / get
request it went away.
Here's an example of what I did first:
------------------ first -----------------------------------
private static DataContext context;
private void doPost( ... ) {
context = ServletUtil.getSessionContext(request.getSession());
....
getLoggerConfig(context );
...
}
After changing it like this, the problems went away.
------------------ second-----------------------------------
private void doPost( ... ) {
DataContext context = ServletUtil.getSessionContext(request.getSession());
....
getLoggerConfig(context );
...
}
But unfortunately after 3 or 4 weeks I got the same error again, but only very
rarly. Now I was told that it is forbiden to start a new thread in a servlet.
And that's what I did. So hopefully the exception is definitly solved now.
Also a colleague told me that it can cause problems to create the cayenne
context in a servlet like above. Instead of that it should be better to do it
like this:
DataDomain domain = Configuration.getSharedConfiguration().getDomain();
DataContext dctx = domain.createDataContext();
Maybe some one other can comment it ?
Hope that helps.
Lothar
> -----Ursprüngliche Nachricht-----
> Von: [email protected]
> Gesendet: 27.07.06 10:39:32
> An: [email protected]
> Betreff: LRUMap.reuseMapping exception with 1.2B3
> Hello.
>
> I just got a exception from LRUMap.reuseMapping using cayenne-1.2B3.
> I remember this discussion earlier this summer, but is it fixed in
> 1.2 final? CAY-565 are resolved with resolution "Cannot Reproduce"..
>
> java.lang.NullPointerException
> at org.apache.commons.collections.map.LRUMap.reuseMapping
> (LRUMap.java:235)
> at org.apache.commons.collections.map.LRUMap.addMapping(LRUMap.java:
> 211)
> at org.apache.commons.collections.map.AbstractHashedMap.put
> (AbstractHashedMap.java:314)
> at
> org.objectstyle.cayenne.access.DataDomainQueryAction.interceptOIDQuery
> (DataDomainQueryAction.java:187)
> at org.objectstyle.cayenne.access.DataDomainQueryAction.execute
> (DataDomainQueryAction.java:142)
> at org.objectstyle.cayenne.access.DataDomain.onQuery(DataDomain.java:
> 765)
> at org.objectstyle.cayenne.util.ObjectContextQueryAction.runQuery
> (ObjectContextQueryAction.java:253)
> at org.objectstyle.cayenne.access.DataContextQueryAction.execute
> (DataContextQueryAction.java:90)
> at org.objectstyle.cayenne.access.DataContext.onQuery
> (DataContext.java:1422)
> at org.objectstyle.cayenne.access.DataContext.performQuery
> (DataContext.java:1411)
> at org.objectstyle.cayenne.DataObjectUtils.objectForQuery
> (DataObjectUtils.java:290)
> at org.objectstyle.cayenne.DataObjectUtils.objectForPK
> (DataObjectUtils.java:276)
> at org.objectstyle.cayenne.DataObjectUtils.objectForPK
> (DataObjectUtils.java:185)
>
> - Tore.
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