<br>URL[] urls = new URL[]{ new URL(&quot;file://&quot;+path)<br><br>Are you using relative or absolute paths for classLoaders?<br><br>Did you check that the paths are valid when you deploy your application in Tomcat container?<br>
<br><br>Cheers,<br><br>Swapnil<br><br><div class="gmail_quote">2009/11/4 Hemanth kumar <span dir="ltr">&lt;<a href="mailto:hemanth@saha.in">hemanth@saha.in</a>&gt;</span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="im"><br>
swapnil thanx for the reply,<br>
this is my modified code<br>
<br>
try{<br>
<br>
            System.out.println(&quot;Initializing Fact....&quot;);<br>
<br>
<br>
</div><div class="im">            URL[] urls = new URL[]{ new URL(&quot;file://&quot;+path) };<br>
</div>             ClassLoader loader =  new URLClassLoader(urls);<br>
             Class clazz  = loader.loadClass(&quot;test.Message&quot;);<br>
<div class="im">                              //Class.forName(&quot;test.Message&quot;, false, ucl);<br>
             Object factObj = clazz.newInstance();<br>
             String ruleFile = &quot;test/Sample.drl&quot;;<br>
<br>
</div>             Method method = clazz.getMethod(&quot;setMessage&quot;, new<br>
Class[]{String.class});<br>
<div class="im">             Method method1 = clazz.getMethod(&quot;getMessage&quot;);<br>
<br>
</div><div class="im">             //System.out.println(&quot;facts loaded\n&quot;);<br>
<br>
</div><div class="im">             method.invoke(factObj, new Object[]{&quot;Hello&quot;});<br>
<br>
             System.out.println(&quot;initializing packageBuilder&quot;);<br>
<br>
             PackageBuilderConfiguration config = new<br>
PackageBuilderConfiguration();<br>
             config.setClassLoader(loader);<br>
<br>
            KnowledgeBuilder kbuilder =<br>
KnowledgeBuilderFactory.newKnowledgeBuilder(config);<br>
<br>
            System.out.println(&quot;finding Rule&quot;);<br>
<br>
kbuilder.add(ResourceFactory.newClassPathResource(&quot;test/Sample.drl&quot;),ResourceType.DRL);<br>
<br>
            if (kbuilder.hasErrors())<br>
                  throw new RuntimeException(&quot;Unable to compile rules. &quot; +<br>
                            kbuilder.getErrors().toString());<br>
<br>
<br>
            KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(new<br>
RuleBaseConfiguration(loader));<br>
<br>
            kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());<br>
<br>
            StatelessKnowledgeSession session =<br>
kbase.newStatelessKnowledgeSession();<br>
<br>
            System.out.println(&quot;running rule....... \n&quot;);<br>
             session.execute(factObj);<br>
<br>
             System.out.println(&quot;\nend...\n&quot;);<br>
             System.out.println(method1.invoke(factObj).toString());<br>
<br>
        }<br>
</div><div class="im">        catch (Throwable t) {<br>
            t.printStackTrace();<br>
        }<br>
<br>
------------------------------------------------------------<br>
</div>Added the following JARS in WEB-INF\lib<br>
<br>
antlr-runtime-3.1.1.jar<br>
core-3.4.2.v_883_R34x.jar<br>
drools-api-5.0.1.jar<br>
drools-core-5.0.1.jar<br>
drools-decisiontables-5.0.1.jar<br>
mvel2-2.0.10.jar<br>
drools-compiler-5.0.1.jar<br>
xstream-1.3.1.jar<br>
<br>
<br>
<br>
thanx and regards<br>
Hemanth<br>
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</div></div></blockquote></div><br>