[jboss-jira] [JBoss JIRA] (DROOLS-345) NotSerializableException when attempting to serialize kcontext.getMatch().getObjects()

NotSerializableException when attempting to serialize kcontext.getMatch().getObjects() -------------------------------------------------------------------------------------- Key: DROOLS-345 URL: https://issues.jboss.org/browse/DROOLS-345 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 6.0.0.CR4 Environment: Windows, Oracle Java JDK 1.7.0_21 Reporter: Reinis Vicups Assignee: Mark Proctor Optaplanner is using kcontext.getMatch().getObjects() to retrieve objects participating in the match. This rule {code} rule "failing rule" when $project : Project $resourceParallelism : Set from accumulate( Assignment(project == $project, resource != null, $resource : resource), collectSet($resource) ) then scoreHolder.addHardConstraintMatch(kcontext, -Math.abs($resourceParallelism.size() - $project.getOptimalResourceParallelism())); end {code} cause kcontext.getMatch().getObjects() later on to return List with two elements: 1. element is instance of Project (serializable) 2. element is instance of HashMap$KeySet of Resource (serializable) Issue is - HashMap$KeySet is not serializable thus causing the said Exception. I checked up with Mr. Proctor and Mr. De Smet. The final assumption was that accumulate could somehow cause HashMap$KeySet to be returned. Would be great if someone with understanding could check out how the objects get into kcontext.getMatch().getObjects() from the above rule and if it is drools wrapping my objects in HashMap$KeySet