[rules-users] couuld not load fact to rule engine

Hemanth kumar hemanth at saha.in
Tue Oct 27 02:30:04 EDT 2009



hi,
Im working on a sample test project.
In that im dynamically creating a class ( fact) and compiling it.

here is my test project
--------------------------------------------------------------------------------------
mainJavaclass


public void runRule()
	 {		
		 try {
			    System.out.println("\nRunning rule\n");
				
				// go !
								
				URL[] urls = new URL[]{ new URL("file://"+path) };
				
				URLClassLoader ucl =  new URLClassLoader(urls);
				Class<?> clazz  = ucl.loadClass("test.Message");
				Object classObj = clazz.newInstance();
				
				
				Method method = clazz.getDeclaredMethod("setMessage", new
Class[]{String.class});
				
				//System.out.println("facts loaded\n");
		
				method.invoke(classObj, new Object[]{"Hello"});								
								 
				
				log.info("==== Calling Rule Runner ======");
				
				Collection facts = new ArrayList();
				facts.add(classObj);
				
				
				// Load and fire our rules files against the data
				new RuleRunner().runStatelessRules(RULES_FILES, null, facts, null, null,
logger);
				
			} 
		 	catch (Throwable t) {
				t.printStackTrace();				
			}
			
	 }

----------------------------------------------------------------------
Fact

package test;
public class Message{
private String message;
public String getMessage(){
return this.message;
}

public void setMessage(String message) {
this.message = message;
}

}


------------------------------------------------------------------------
sample rule

package test
import test.Message;

rule "Your First Rule"
     dialect "mvel"
     when
          m:Message(message != "Good Bye"  )
     then
          System.out.println("First Rule fired    "+m.message );
          modify(m){ message = "Good Bye"};
end
-----------------------------------------------------------------
console file  http://www.nabble.com/file/p26072723/console.PNG console.PNG 

what happens is when i was running the project inside eclipse IDE it works
fine but when i hosted in tomcat and calling from outside ide the rule is
not getting fired.
I think the dyanamically loaded class is not recognised by the rule engine.

suggest me any ideas

Hemanth
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