I'm running into an intermittent error when running a bunch of unit tests (though it also occurs when I run a specific test). Before running the tests I clear the mongo database table by table. Every now and then I get the following:

Oct 31, 2013 1:22:27 PM com.mongodb.DBPortPool gotError
WARNING: emptying DBPortPool to /127.0.0.1:27017 b/c of error
com.mongodb.MongoException: ids don't match
at com.mongodb.DBTCPConnector.innerCall(DBTCPConnector.java:285)
at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:256)
at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:289)
at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:274)
at com.mongodb.DB.getCollectionNames(DB.java:381)
at com.parc.cip.repository.MongoDatabaseBridge.cleanDB(MongoDatabaseBridge.java:74)

the line in file is:

Set<String> collectionNames = db.getCollectionNames();

This has been replicated on a few different machines. I am running 2.4.7 of the mongo database.