[rules-users] Why does it make this error?PB using globals

hello all, Well i try to use global in one of my rules and it doesn't go well ^^. So in my code i have declared a Boolean flagTest = new Boolean(true), set it to a statless session : session.setGlobals("debugFlag", flagTest)and in my rule i have put : global java.lang.Boolean debugFlag. When Drools does : globals.putAll( newPkg.getGlobals() ); line 495 in AbstractRuleBase it throw java.lang.UnsupportedOperationException :-s Is it normal or is it a bug?? Nicolas