title: Jboss AS 7 not deploying giving Servlet exception from rt.jar(1.6.0_20)
body: <pre><code>17:34:55,756 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-1) MSC00001: Failed to start service jboss.deployment.unit."Hello.war".POST_MODULE: org.jboss.msc.service.StartException in service jboss.deployment.unit."Hello.war".POST_MODULE: Failed to process phase POST_MODULE of deployment "Hello.war"
      at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:119) [jboss-as-server-7.1.1.Final.jar:7.1.1.Final]
      at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
      at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
      at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [rt.jar:1.6.0_20]
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [rt.jar:1.6.0_20]
      at java.lang.Thread.run(Thread.java:619) [rt.jar:1.6.0_20]
  Caused by: java.lang.RuntimeException: Error getting reflective information for class com.infotech.hello.web.util.CacheApplicationData with ClassLoader ModuleClassLoader for Module "deployment.Hello.war:main" from Service Module Loader
      at org.jboss.as.server.deployment.reflect.DeploymentReflectionIndex.getClassIndex(DeploymentReflectionIndex.java:70) [jboss-as-server-7.1.1.Final.jar:7.1.1.Final]
      at org.jboss.as.ee.metadata.MethodAnnotationAggregator.runtimeAnnotationInformation(MethodAnnotationAggregator.java:58)
      at org.jboss.as.ee.component.deployers.InterceptorAnnotationProcessor.handleAnnotations(InterceptorAnnotationProcessor.java:85)
      at org.jboss.as.ee.component.deployers.InterceptorAnnotationProcessor.processComponentConfig(InterceptorAnnotationProcessor.java:70)
      at org.jboss.as.ee.component.deployers.InterceptorAnnotationProcessor.deploy(InterceptorAnnotationProcessor.java:55)
      at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:113) [jboss-as-server-7.1.1.Final.jar:7.1.1.Final]
      ... 5 more
  Caused by: java.lang.NoClassDefFoundError: ServletException
      at java.lang.Class.getDeclaredMethods0(Native Method) [rt.jar:1.6.0_20]
      at java.lang.Class.privateGetDeclaredMethods(Class.java:2427) [rt.jar:1.6.0_20]
      at java.lang.Class.getDeclaredMethods(Class.java:1791) [rt.jar:1.6.0_20]
      at org.jboss.as.server.deployment.reflect.ClassReflectionIndex.&lt;init&gt;(ClassReflectionIndex.java:65) [jboss-as-server-7.1.1.Final.jar:7.1.1.Final]
      at org.jboss.as.server.deployment.reflect.DeploymentReflectionIndex.getClassIndex(DeploymentReflectionIndex.java:66) [jboss-as-server-7.1.1.Final.jar:7.1.1.Final]
      ... 10 more
  Caused by: java.lang.ClassNotFoundException: ServletException from [Module "deployment.Hello.war:main" from Service Module Loader]
      at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:190)
      at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:468)
      at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:456)
      at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:423)
      at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:398)
      at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:120)
      ... 15 more
  </code></pre>
  
  <p>i am not understanding the reason for this error 
  "<strong>Caused by: java.lang.NoClassDefFoundError: ServletException
          at java.lang.Class.getDeclaredMethods0(Native Method) [rt.jar:1.6.0_20]</strong>"</p>