You are using old API. Which version of drools are you using? 
You need to do something like:

KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newXXXResource(YYY); , ResourceType.DRL); //replace XXX for the type of resource you want
//add all your resources

//check for errors
if (kbuilder.hasEsrrors()){
...
}

KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());

I'm pretty sure all this steps are currently described in the documentation. 

Best Regards,

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Esteban Aliverti
- Developer @ http://www.plugtree.com
- Blog @ http://ilesteban.wordpress.com


On Thu, Jan 12, 2012 at 1:37 PM, srinivasasanda <srinivasasanda@gmail.com> wrote:
Hi
    I wrote code for creating RuleBase. But I got error at retrieving URL
resource by passing ruleFile to the getResource() method.It is returning
null. How to get the URL resource. I posted the sample code which  i have
written for creating RuleBase.
public RuleBase createRuleBase() throws Exception
{
               if(rules==null)
               {
                       throw new Exception("No rules provided for Engine");
               }

               ruleBase = RuleBaseFactory.newRuleBase();
               PackageBuilder builder = new PackageBuilder();

               for(String ruleFile : rules)
               {
                       System.out.println("Rule is "+ruleFile); //prints
the ruleFile
                       URL resource = this.getClass().getResource(ruleFile); //gets the URL
resource of the ruleFile

                       if(resource==null)
                       {
                               System.err.println("Could not find resource: "+ruleFile);
                               continue;
                       }

                       File file = new File(this.getClass().getResource(ruleFile).getPath());
                       if(!file.exists())
                       {
                               System.err.println("Could not find rule file: "+file.getPath());
                               continue;
                       }

                       builder.addPackageFromDrl(new FileReader(file.getPath()));
               }

               org.drools.rule.Package pkg = builder.getPackage();
               ruleBase.addPackage(pkg);

               return ruleBase;
       }

My Packages are not adding to RuleBase.It is returning null.

How to add the packages to ruleBase.Please suggest me

Thanks

--
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