builder.addPackageFromDrl( source );
Package pkg = builder.getPackage();
RuleBase ruleBase = RuleBaseFactory.newRuleBase();
ruleBase.addPackage( pkg );
StatefulSession session = ruleBase.newStatefulSession();
session.fireAllRules();
session = getSerialisedStatefulSession( session );
session.insert( new Message() );
session.insert( new Message() );
session.insert( new Message() );