11 Replies Latest reply: Feb 21, 2011 12:37 PM by Mike schwery RSS

    drools error [ERR 102] Line 40:43 mismatched input '&&' expecting ')' in rule "Free Fish Food Sample"

    Mike schwery Novice

      I'm getting the drools error [ERR 102] Line 40:43 mismatched input '&&' expecting ')' in rule "Free Fish Food Sample"

      in from the Pet Store sample in JBoss Developer Studio 4.0 CR1. Can anybody help me get rid of this error.

       

      rule "Free Fish Food Sample"

          agenda-group "evaluate"

          dialect "mvel"

          when

              $order : Order()

              not ( $p : Product( name == "Fish Food") && Purchase( product == $p )

              not ( $p : Product( name == "Fish Food Sample") && Purchase( product == $p ) )       

              exists ( $p : Product( name == "Gold Fish") && Purchase( product == $p ) )   

              $fishFoodSample : Product( name == "Fish Food Sample" );

          then

              System.out.println( "Adding free Fish Food Sample to cart" );

              purchase = new Purchase($order, $fishFoodSample);

              insert( purchase );

              $order.addItem( purchase );   

      end

        • 1. drools error [ERR 102] Line 40:43 mismatched input '&&' expecting ')' in rule "Free Fish Food Sample"
          Mauricio Salatino Master

          Hi there.. Looks like the first not requires an extra parenthesis at the end right?

          not ( $p : Product( name == "Fish Food") && Purchase( product == $p ))

           

          Greetings.

          • 2. drools error [ERR 102] Line 40:43 mismatched input '&&' expecting ')' in rule "Free Fish Food Sample"
            Mike schwery Novice

            Still get the errors

            [ERR 102] Line 40:43 mismatched input '&&' expecting ')' in rule "Free Fish Food Sample"

            [ERR 102] Line 40:71 mismatched input ')' expecting 'then' in rule "Free Fish Food Sample"

            • 3. drools error [ERR 102] Line 40:43 mismatched input '&&' expecting ')' in rule "Free Fish Food Sample"
              Mauricio Salatino Master

              Hi Mike,

              Try with this:

              rule "Free Fish Food Sample"

                  agenda-group "evaluate"

                  dialect "mvel"

                  when

                      $order : Order()

                      not ( $p : Product( name == "Fish Food") && Purchase( product == $p ))

                      not ( $p : Product( name == "Fish Food Sample") && Purchase( product == $p ) )       

                      exists ( $p : Product( name == "Gold Fish") && Purchase( product == $p ) )   

                      $fishFoodSample : Product( name == "Fish Food Sample" )

                  then

                      System.out.println( "Adding free Fish Food Sample to cart" );

                      purchase = new Purchase($order, $fishFoodSample);

                      insert( purchase );

                      $order.addItem( purchase );   

              end

               

              I've added 1 closing parenthesis ) and I remove the ; in the last condition in the when part.

              Greetings

              • 4. drools error [ERR 102] Line 40:43 mismatched input '&&' expecting ')' in rule "Free Fish Food Sample"
                Mike schwery Novice

                now it says

                Unable to load dialect 'org.drools.rule.builder.dialect.mvel.MVELDialectConfiguration:mvel:org.drools.rule.builder.dialect.mvel.MVELDialectConfiguration'

                • 5. drools error [ERR 102] Line 40:43 mismatched input '&&' expecting ')' in rule "Free Fish Food Sample"
                  Mauricio Salatino Master

                  Good, now the Rule is correct.

                  You need to check if you have Mvel in your application classpath. What version of Drools are you using?

                  Greetings.

                  • 6. drools error [ERR 102] Line 40:43 mismatched input '&&' expecting ')' in rule "Free Fish Food Sample"
                    Mike schwery Novice

                    full rule

                     

                    package org.drools.examples

                     

                    import org.drools.WorkingMemory

                    import org.drools.examples.PetStore.Order

                    import org.drools.examples.PetStore.Purchase

                    import org.drools.examples.PetStore.Product

                    import java.util.ArrayList

                    import javax.swing.JOptionPane;

                    import javax.swing.JFrame        

                    global JFrame frame

                    global javax.swing.JTextArea textArea

                     

                    //dialect "mvel"

                     

                    // insert each item in the shopping cart into the Working Memory

                    rule "Explode Cart"

                        agenda-group "init"

                        auto-focus true   

                        salience 10

                        dialect "java"

                        when

                            $order : Order( grossTotal == -1 )

                            $item : Purchase() from $order.items

                        then

                            insert( $item );

                            drools.getKnowledgeRuntime().getAgenda().getAgendaGroup( "show items" ).setFocus();       

                            drools.getKnowledgeRuntime().getAgenda().getAgendaGroup( "evaluate" ).setFocus();       

                    end

                     

                     

                    // Free Fish Food sample when we buy a Gold Fish if we haven't already  bought

                    // Fish Food and dont already have a Fish Food Sample

                    rule "Free Fish Food Sample"

                        agenda-group "evaluate"

                        dialect "mvel"

                        when

                            $order : Order()

                            not ( $p : Product( name == "Fish Food") && Purchase( product == $p ))

                            not ( $p : Product( name == "Fish Food Sample") && Purchase( product == $p ) )       

                            exists ( $p : Product( name == "Gold Fish") && Purchase( product == $p ) )   

                            $fishFoodSample : Product( name == "Fish Food Sample" );

                        then

                            System.out.println( "Adding free Fish Food Sample to cart" );

                            purchase = new Purchase($order, $fishFoodSample);

                            insert( purchase );

                            $order.addItem( purchase );   

                    end

                     

                     

                    // Suggest a tank if we have bought more than 5 gold fish and dont already have one

                    rule "Suggest Tank"

                           agenda-group "evaluate"

                           dialect "java"

                        when

                            $order : Order()

                            not ( $p : Product( name == "Fish Tank") && Purchase( product == $p ) )   

                            ArrayList( $total : size > 5 ) from collect( Purchase( product.name == "Gold Fish" ) )

                            $fishTank : Product( name == "Fish Tank" )       

                        then

                            requireTank(frame, drools.getWorkingMemory(), $order, $fishTank, $total);    

                    end   

                     

                    rule "Show Items"

                        agenda-group "show items"

                        dialect "java"

                        when

                            $order : Order( )

                            $p : Purchase( order == $order )

                        then   

                            textArea.append( $p.getProduct() + "\n");

                    end

                     

                    rule "do checkout"

                            dialect "java"

                        when

                        then

                            doCheckout(frame, drools.getWorkingMemory());

                    end   

                     

                    rule "Gross Total"

                        agenda-group "checkout"

                        dialect "mvel"

                        when

                            $order : Order( grossTotal == -1)

                            Number( total : doubleValue ) from accumulate( Purchase( $price : product.price ),

                                                                                  sum( $price ) )

                        then   

                            modify( $order ) { grossTotal = total }

                            textArea.append( "\ngross total=" + total + "\n" );

                    end

                     

                    rule "Apply 5% Discount"

                        agenda-group "checkout"

                        dialect "mvel"

                        when

                            $order : Order( grossTotal >= 10 && < 20 )

                        then

                            $order.discountedTotal = $order.grossTotal * 0.95;

                            textArea.append( "discountedTotal total=" + $order.discountedTotal + "\n" );       

                    end

                     

                     

                    rule "Apply 10% Discount"

                        agenda-group "checkout"

                        dialect "mvel"

                        when

                            $order : Order( grossTotal >= 20 )

                        then

                            $order.discountedTotal = $order.grossTotal * 0.90;

                            textArea.append( "discountedTotal total=" + $order.discountedTotal + "\n" );   

                    end

                     

                    function void doCheckout(JFrame frame, WorkingMemory workingMemory) {

                            Object[] options = {"Yes",

                                                "No"};

                                               

                            int n = JOptionPane.showOptionDialog(frame,

                                                                 "Would you like to checkout?",

                                                                 "",

                                                                 JOptionPane.YES_NO_OPTION,

                                                                 JOptionPane.QUESTION_MESSAGE,

                                                                 null,

                                                                 options,

                                                                 options[0]);

                     

                           if (n == 0) {

                                workingMemory.setFocus( "checkout" );

                           }  

                    }

                     

                    function boolean requireTank(JFrame frame, WorkingMemory workingMemory, Order order, Product fishTank, int total) {

                            Object[] options = {"Yes",

                                                "No"};

                                               

                            int n = JOptionPane.showOptionDialog(frame,

                                                                 "Would you like to buy a tank for your " + total + " fish?",

                                                                 "Purchase Suggestion",

                                                                 JOptionPane.YES_NO_OPTION,

                                                                 JOptionPane.QUESTION_MESSAGE,

                                                                 null,

                                                                 options,

                                                                 options[0]);

                                                                

                           System.out.print( "SUGGESTION: Would you like to buy a tank for your "

                                               + total + " fish? - " );

                     

                           if (n == 0) {

                                 Purchase purchase = new Purchase( order, fishTank );

                                 workingMemory.insert( purchase );

                                 order.addItem( purchase );

                                 System.out.println( "Yes" );

                           } else {

                                System.out.println( "No" );

                           }     

                           return true;

                    }

                    • 9. drools error [ERR 102] Line 40:43 mismatched input '&&' expecting ')' in rule "Free Fish Food Sample"
                      Mike schwery Novice

                      should i see the MVEL jar under properties/java build path

                      • 10. drools error [ERR 102] Line 40:43 mismatched input '&&' expecting ')' in rule "Free Fish Food Sample"
                        Mauricio Salatino Master

                        can you check if you have drools-compiler in the classpath too?

                        Yes.. MVEL should be there..

                        Greetings.

                        • 11. drools error [ERR 102] Line 40:43 mismatched input '&&' expecting ')' in rule "Free Fish Food Sample"
                          Mike schwery Novice

                          I see mvel in the drools runtime which is in the classpath and I've got the compiler in the classpath.

                           

                          Now I'm back to the original errors