Unexpected purge process error at openfire debug log(Postgre SQL DB)

Hi, I'm currently deploying OpenFire in a research environment. Checking the logs I found the following error:

DELETE ofPubsubItem FROM ofPubsubItem LEFT JOIN (SELECT id FROM

ofPubsubItem WHERE serviceID=uuuuuuu@dddddddd AND nodeID=http://jabber.org/protocol/geoloc ORDER BY creationDate DESC LIMIT 1) AS noDelete

ON ofPubsubItem.id = noDelete.id WHERE noDelete.id IS NULL AND ofPubsubItem.serviceID = uuuuuuu@dddddddd AND nodeID = http://jabber.org/protocol/geoloc

       at org.postgresql.jdbc2.AbstractJdbc2Statement$BatchResultHandler.handleError(Abst ractJdbc2Statement.java:2531)

        at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java: 1344)

        at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:343)

        at org.postgresql.jdbc2.AbstractJdbc2Statement.executeBatch(AbstractJdbc2Statement .java:2670)

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.ja va:43)

        at java.lang.reflect.Method.invoke(Method.java:616)

        at org.logicalcobwebs.proxool.ProxyStatement.invoke(ProxyStatement.java:100)

        at org.logicalcobwebs.proxool.ProxyStatement.intercept(ProxyStatement.java:57)

        at org.postgresql.PGStatement$$EnhancerByProxool$$6a8d54dc.executeBatch(<generated >)

        at org.jivesoftware.openfire.pubsub.PubSubPersistenceManager.purgeItems(PubSubPers istenceManager.java:1878)

I tested the query against PostgreSQL (adding the corresponding quotes) and got a sintax error.

So, I looked into the source code and found this:

http://fisheye.igniterealtime.org/browse/openfire/trunk/src/java/org/jivesoftwar e/openfire/pubsub/PubSubPersistenceManager.java?r=13651

privatestaticfinalStringPURGE_FOR_SIZE =

               "DELETE ofPubsubItem FROM ofPubsubItem LEFT JOIN " +

                        "(SELECT id FROM ofPubsubItem WHERE serviceID=? AND nodeID=? " +

                        "ORDER BY creationDate DESC LIMIT ?) AS noDelete " +

                        "ON ofPubsubItem.id = noDelete.id WHERE noDelete.id IS NULL AND " +

                        "ofPubsubItem.serviceID = ? AND nodeID = ?";

I guess that it can be rewrited as:

private static final String PURGE_FOR_SIZE =

                         "DELETE from ofPubsubItem where id in (select ofPubsubItem.id FROM ofPubsubItem LEFT JOIN " +

                     "(SELECT id FROM ofPubsubItem WHERE serviceID=? AND nodeID=? " +

                     "ORDER BY creationDate DESC LIMIT ?) AS noDelete " +

                     "ON ofPubsubItem.id = noDelete.id WHERE noDelete.id IS NULL AND " +

                     "ofPubsubItem.serviceID = ? AND nodeID = ?)";

that seems to do the purging process in PostgreSQL

I build the source and replace the class in the openfire.jar, restarted openfire and then the error dissapear with no other effects.

I hope that you can review this purging process. Thanks in advance.

PD: Sorry if this post is a dupplicate, I've searched the forum for a while without results about this specific topic.