title: exception while running drool sample program
body: <p>I am new to drools.I tried to execute sample program.I m gettng these exceptions</p>
  
  <pre><code>Exception in thread "main" java.lang.NoClassDefFoundError: org/drools/event /KnowledgeRuntimeEventManager
     at java.lang.Class.getDeclaredMethods0(Native Method)
     at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
     at java.lang.Class.getMethod0(Unknown Source)
     at java.lang.Class.getMethod(Unknown Source)
     at sun.launcher.LauncherHelper.getMainMethod(Unknown Source)
     at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
  Caused by: java.lang.ClassNotFoundException: org.drools.event.KnowledgeRuntimeEventManager
     at java.net.URLClassLoader$1.run(Unknown Source)
     at java.net.URLClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
      ... 6 more
  </code></pre>