public MessageMgr build(){
		if(this.messageHandlers.size()==0){
			this.buildErrors.addError("no message handlers set");
			return null;
		}
		return new MessageMgr(this.appID, this.messageHandlers, this.doCollectMessages);
	}
public MessageMgr build ( ) { if ( this . messageHandlers . size ( ) == 0 ) { this . buildErrors . addError ( "no message handlers set" ) ; return null ; } return new MessageMgr ( this . appID , this . messageHandlers , this . doCollectMessages ) ; }
Builds a {@link MessageMgr}.
@return an new manager if all required parameters are set, null if not with errors being logged