[jboss-jira] [JBoss JIRA] (JBRULES-3240) Unable to build expression for 'inline-eval' when using Lists of objects

[Richard Ambridge (Created) (JIRA)]

Unable to build expression for 'inline-eval' when using Lists of objects
------------------------------------------------------------------------

                 Key: JBRULES-3240
                 URL: https://issues.jboss.org/browse/JBRULES-3240
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-compiler
    Affects Versions: 5.3.0.CR1
         Environment: Ubuntu, JDK 1.6.0.26
            Reporter: Richard Ambridge
            Assignee: Mark Proctor


If a Rule has a .size== in when and the variable is an Object, then we get the following:-
Unable to build expression for 'inline-eval' : [Error: incompatible types in statement: class java.lang.Integer (compared from: class droolstesting.SubType)]

Full example:

Rule:

package droolstesting

rule "rule2"
dialect "mvel"
when
  $m : MyItem(items!=null || items.size == 0)
then
  System.out.println("Got 0");
  retract($m)
end

MyItems.java:

package droolstesting;

import java.util.ArrayList;
import java.util.List;

public class MyItem {
    int number=0;
    String string="empty";

    List<SubType> items=new ArrayList<SubType>();

    public List<SubType> getItems() {
        return items;
    }

    public void setItems(List<SubType> items) {
        this.items = items;
    }

    public int getNumber() {
        return number;
    }

    public void setNumber(int number) {
        this.number = number;
    }

    public String getString() {
        return string;
    }

    public void setString(String string) {
        this.string = string;
    }


}

SubType.java:
package droolstesting;
public class SubType {
   String name="";
   
}


Main.java:
package droolstesting;

import java.io.File;
import java.io.IOException;
import org.drools.compiler.DroolsParserException;
import org.drools.compiler.PackageBuilder;
import org.drools.io.ResourceFactory;

/**
 *
 * @author richarda
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException, DroolsParserException {
        PackageBuilder pkgBuilder = new PackageBuilder();
        pkgBuilder.addPackageFromDrl(ResourceFactory.newClassPathResource("rule1.drl"));
        if (pkgBuilder.hasErrors()) {
            System.err.println(pkgBuilder.getErrors().toString());
            throw new RuntimeException("Unable to compile rules");
        }
        pkgBuilder.addPackageFromDrl(ResourceFactory.newClassPathResource("rule2.drl"));
        if (pkgBuilder.hasErrors()) {
            System.err.println(pkgBuilder.getErrors().toString());
            throw new RuntimeException("Unable to compile rules");
        }
    }
}


Result:

run:
Unable to build expression for 'inline-eval' : [Error: incompatible types in statement: class java.lang.Integer (compared from: class droolstesting.SubType)]
[Near : {... items != null || items.size == 0 ....}]
                              ^
[Line: 6, Column: 14]'items != null || items.size == 0'
[Error: incompatible types in statement: class java.lang.Integer (compared from: class droolstesting.SubType)]
[Near : {... items != null || items.size == 0 ....}]
                              ^
[Line: 6, Column: 14] : [Rule name='rule2']
[Error: incompatible types in statement: class java.lang.Integer (compared from: class droolstesting.SubType)]
[Near : {... items != null || items.size == 0 ....}]
                              ^
[Line: 1, Column: 18]

Exception in thread "main" java.lang.RuntimeException: Unable to compile rules
        at droolstesting.Main.main(Main.java:32)
Java Result: 1
BUILD SUCCESSFUL (total time: 1 second)


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