title: Not able to start Tomcat 7 using Eclipse
body: <p>Timeout is set to 45 sec but even after increasing timeout it is not working.
  I have even servlet-api.jar file at tomcat lib library, it is present there.</p>
  
  <p>SEVERE: A child container failed during start</p>
  
  <pre><code>java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/HelloWorld]]
      at java.util.concurrent.FutureTask.report(Unknown Source)
      at java.util.concurrent.FutureTask.get(Unknown Source)
      at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1130)
      at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:782)
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
      at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1568)
      at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1558)
      at java.util.concurrent.FutureTask.run(Unknown Source)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
      at java.lang.Thread.run(Unknown Source)
  Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/HelloWorld]]
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
      ... 6 more
  Caused by: org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 15
      at org.apache.tomcat.util.bcel.classfile.Constant.readConstant(Constant.java:131)
      at org.apache.tomcat.util.bcel.classfile.ConstantPool.&lt;init&gt;(ConstantPool.java:60)
      at org.apache.tomcat.util.bcel.classfile.ClassParser.readConstantPool(ClassParser.java:209)
      at org.apache.tomcat.util.bcel.classfile.ClassParser.parse(ClassParser.java:119)
      at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:1972)
      at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:1863)
      at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1831)
      at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1817)
      at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1218)
      at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:825)
      at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:300)
      at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
      at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
      at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5161)
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
      ... 6 more
  
  Apr 03, 2015 8:29:39 PM org.apache.catalina.core.ContainerBase startInternal
  SEVERE: A child container failed during start
  java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
      at java.util.concurrent.FutureTask.report(Unknown Source)
      at java.util.concurrent.FutureTask.get(Unknown Source)
      at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1130)
      at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:293)
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
      at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
      at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:727)
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
      at org.apache.catalina.startup.Catalina.start(Catalina.java:646)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
      at java.lang.reflect.Method.invoke(Unknown Source)
      at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322)
      at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:450)
  Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
      at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1568)
      at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1558)
      at java.util.concurrent.FutureTask.run(Unknown Source)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
      at java.lang.Thread.run(Unknown Source)
  Caused by: org.apache.catalina.LifecycleException: A child container failed during start
      at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1138)
      at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:782)
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
      ... 6 more
  
  Apr 03, 2015 8:29:39 PM org.apache.catalina.startup.Catalina start
  SEVERE: Catalina.start: 
  org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8005]]
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
      at org.apache.catalina.startup.Catalina.start(Catalina.java:646)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
      at java.lang.reflect.Method.invoke(Unknown Source)
      at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322)
      at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:450)
  Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardService[Catalina]]
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
      at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:727)
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
      ... 7 more
  Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina]]
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
      at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
      ... 9 more
  Caused by: org.apache.catalina.LifecycleException: A child container failed during start
      at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1138)
      at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:293)
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
      ... 11 more
  
  Apr 03, 2015 8:29:39 PM org.apache.catalina.startup.Catalina start
  INFO: Server startup in 435 ms
  </code></pre>