title: ERROR org.drools.compiler.kie.builder.impl.KieContainerImpl - Unknown KieSession name: in drools 6.2.0
body: <p>I am simply trying to run the helloWorld example from the Git repo : 
  <a href="https://github.com/droolsjbpm/drools/tree/master/drools-examples/src/main/java/org/drools/examples/helloworld" rel="nofollow">https://github.com/droolsjbpm/drools/tree/master/drools-examples/src/main/java/org/drools/examples/helloworld</a></p>
  
  <p>For this I created a Drools project in IntelliJ 14.1.5
  JDK - 1.7</p>
  
  <p>When I try and run the HelloWorld file from IntelliJ I get the below error:</p>
  
  <pre><code>[main] ERROR org.drools.compiler.kie.builder.impl.KieContainerImpl - Unknown KieSession name: HelloWorldKS
  Exception in thread "main" java.lang.NullPointerException
      at main.java.org.drools.examples.helloworld.HelloWorldExample.execute(HelloWorldExample.java:37)
      at main.java.org.drools.examples.helloworld.HelloWorldExample.main(HelloWorldExample.java:26)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:606)
      at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
  </code></pre>
  
  <p>I have the kmodule.xml present in resources/META-INF folder.
  I also have pom.properties file containing the correct group and artifactId.</p>
  
  <p>Have I missed anything specific?</p>