[jboss-user] [Beginners Corner] - [JBoss Rules with DSL] Unable to expand

[tom.collet]

Hi there, 

I'm a newbie on Jboss and I try to use a basic DSL with a basic rule :

My DSL file called TctMyDSL.dsl :
---------------------------------------

[consequence][]print "{message}"=System.out.println("{message}");

My DRL file :
---------------

package tom
  | import java.util.Date;
  | 
  | expander TctMyDSL.dsl
  | 
  | rule "TctMyRule2"
  | 
  | 	when
  | 		
  | 	then 
  | 		print : "TctMyRule2-->then"
  | end

To fire my rule, I use a servlet deployed on a jboss-4.0.5.GA server / Vista and using the java 1.5 version :

My Servlet :
--------------


  | imports ...
  | 
  | 
  | /**
  |  * Servlet implementation class for Servlet: TctMyServlet
  |  *
  |  */
  |  public class TctMyRulesServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
  |    static final long serialVersionUID = 20101986;
  |    protected static RuleEngine ruleEngine = RuleEngine.getInstance();
  |    private static Logger log = Logger.getLogger(TctMyRulesServlet.class);
  |    
  |     /* (non-Java-doc)
  | 	 * @see javax.servlet.http.HttpServlet#HttpServlet()
  | 	 */
  | 	public TctMyRulesServlet() {
  | 		super();
  | 	}   	
  | 	
  | 	/* (non-Java-doc)
  | 	 * @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
  | 	 */
  | 
  | 	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  | 
  | 		Space space = Space.newInstance();
  | 		space.write(EventI.SP_NOW, new Date());	
  | 		RuleSession	mem = ruleEngine.createSession(null, "TctMyRuleBase");
  | 		mem.addFact((Date)space.read(EventI.SP_NOW));
  | 
  | 		try{
  | 			mem.processFacts();
  | 		}catch(Exception e){
  | 			log.info("Tom say : "+e.getMessage());
  | 		}
  | 	}  	
  | 	
  | 	/* (non-Java-doc)
  | 	 * @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
  | 	 */
  | 	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  | 		this.doGet(request, response); 
  | 	}   	  	    
  | }
  | 


And so I am getting the following error :

 unknown:11:0  Unable to expand: print "TctMyRule2-->then". Due to Expression was not expandable: print "TctMyRule2-->then"


For the moment I don't use my fact to fire my rule (when block is empty) as i'm debugging but in the future I would have something like this :



My future DRL file :
----------------------

package tom
  | import java.util.Date;
  | 
  | expander TctMyDSL.dsl
  | 
  | rule "TctMyRule2"
  | 
  | 	when
  | 		now : Date()
  | 	then 
  | 		print : "message"
  | end

Without DSL file my rules work fine.
Also I have made a lot of research but I get only solutions for punctuation problems like added spaces, missing expander ...

Thank you for your help and please accept my apologies for the bad English :-)

Tom.

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