NullPointerException calling Row.toString() without calling Row.get() first --------------------------------------------------------------------------- Key: DROOLS-30 URL: https://issues.jboss.org/browse/DROOLS-30 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 5.5 Reporter: Ryan Nideffer Assignee: Mario Fusco Attachments: DROOLS-30.patch The object passed to methods of a ViewChangedEventListener that is registered when opening a live query is an instance of org.drools.runtime.rule.impl.RowAdapter and its toString() method throws a NullPointerException if you do not first call get(). This is because toString() assumes the member variable 'factHandles' has been populated, whereas all other accessor methods such as get() first null-check 'factHandles', and if null sets it to the value of this.leftTuples.toFactHandles(). toString in this case should perform the same populating of factHandles, or at the very least perform a null-check of factHandles so that an exception is not thrown.