[rules-users] Class loader problem

[Swapnil Raverkar]

URL[] urls = new URL[]{ new URL("file://"+path)

Are you using relative or absolute paths for classLoaders?

Did you check that the paths are valid when you deploy your application in
Tomcat container?


Cheers,

Swapnil

2009/11/4 Hemanth kumar <hemanth at saha.in>

>
> swapnil thanx for the reply,
> this is my modified code
>
> try{
>
>            System.out.println("Initializing Fact....");
>
>
>             URL[] urls = new URL[]{ new URL("file://"+path) };
>              ClassLoader loader =  new URLClassLoader(urls);
>             Class clazz  = loader.loadClass("test.Message");
>                               //Class.forName("test.Message", false, ucl);
>             Object factObj = clazz.newInstance();
>             String ruleFile = "test/Sample.drl";
>
>              Method method = clazz.getMethod("setMessage", new
> Class[]{String.class});
>              Method method1 = clazz.getMethod("getMessage");
>
>              //System.out.println("facts loaded\n");
>
>              method.invoke(factObj, new Object[]{"Hello"});
>
>             System.out.println("initializing packageBuilder");
>
>             PackageBuilderConfiguration config = new
> PackageBuilderConfiguration();
>             config.setClassLoader(loader);
>
>            KnowledgeBuilder kbuilder =
> KnowledgeBuilderFactory.newKnowledgeBuilder(config);
>
>            System.out.println("finding Rule");
>
>
> kbuilder.add(ResourceFactory.newClassPathResource("test/Sample.drl"),ResourceType.DRL);
>
>            if (kbuilder.hasErrors())
>                  throw new RuntimeException("Unable to compile rules. " +
>                            kbuilder.getErrors().toString());
>
>
>            KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(new
> RuleBaseConfiguration(loader));
>
>            kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
>
>            StatelessKnowledgeSession session =
> kbase.newStatelessKnowledgeSession();
>
>            System.out.println("running rule....... \n");
>             session.execute(factObj);
>
>             System.out.println("\nend...\n");
>             System.out.println(method1.invoke(factObj).toString());
>
>        }
>         catch (Throwable t) {
>            t.printStackTrace();
>        }
>
> ------------------------------------------------------------
> Added the following JARS in WEB-INF\lib
>
> antlr-runtime-3.1.1.jar
> core-3.4.2.v_883_R34x.jar
> drools-api-5.0.1.jar
> drools-core-5.0.1.jar
> drools-decisiontables-5.0.1.jar
> mvel2-2.0.10.jar
> drools-compiler-5.0.1.jar
> xstream-1.3.1.jar
>
>
>
> thanx and regards
> Hemanth
> --
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>
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