This type of error would normally occur when UserTransaction objects are used and they have either timedout or have been mishandled. The indication is that a transaction operation has occurred and that the current transaction does not exists or was improper for the operation. If you are not explictly handling transaction mechanics then the AutoCommit operations of your Datasource is not cooperating with some other object being used by your app that is tring to manipulate the UserTransaction implictly being managed.