title: AppEngine Error [ java.lang.NoClassDefFoundError: org/w3c/dom/ElementTraversal ]
body: <p>i was looking to find a solution for this problem but seems difficult. I have appengine project working with a servlet that handle registration. When i try to call this servlet i have this log report:</p>
  
  <pre><code>012-04-19 10:31:06.816 /register 500 90ms 0kb Apache-HttpClient/UNAVAILABLE (java 1.4)
  ip - gecodroidtest [19/Apr/2012:10:31:06 -0700] "POST /register HTTP/1.1" 500 0 - "Apache-HttpClient/UNAVAILABLE (java 1.4)" "cloudnotifyit.appspot.com" ms=90 cpu_ms=58 api_cpu_ms=0 cpm_usd=0.001738 instance=00c61b117c772731eb45290bfcb07750c0505f
  W 2012-04-19 10:31:06.794
  com.cloudnotify.server.servlet.RequestInfo processRequest: xxxxxxxxxxxx@xxxx  //just for me
  W 2012-04-19 10:31:06.810
  Error for /register 
  java.lang.NoClassDefFoundError: org/w3c/dom/ElementTraversal
      at com.google.appengine.runtime.Request.process-240c2ffe1bf8ddba(Request.java)
      at java.lang.ClassLoader.defineClass1(Native Method)
      at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
      at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
      at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
      at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:616)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
      at org.apache.xerces.parsers.AbstractDOMParser.startDocument(Unknown Source)
      at org.apache.xerces.impl.dtd.XMLDTDValidator.startDocument(Unknown Source)
      at org.apache.xerces.impl.XMLDocumentScannerImpl.startEntity(Unknown Source)
      at org.apache.xerces.impl.XMLVersionDetector.startDocumentParsing(Unknown Source)
      at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
      at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
      at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
      at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
      at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
      at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:121)
      at javax.jdo.JDOHelper.readNamedPMFProperties(JDOHelper.java:1407)
      at javax.jdo.JDOHelper.getNamedPMFProperties(JDOHelper.java:1286)
      at javax.jdo.JDOHelper.getPropertiesFromJdoconfig(JDOHelper.java:1232)
      at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:1079)
      at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:914)
      at com.cloudnotify.server.c2dm.C2DMessaging.getPMF(C2DMessaging.java:103)
      at com.cloudnotify.server.servlet.RequestInfo.initDevices(RequestInfo.java:225)
      at com.cloudnotify.server.servlet.RequestInfo.processRequest(RequestInfo.java:183)
      at com.cloudnotify.server.servlet.RegisterServlet.doPost(RegisterServlet.java:100)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
      at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
      at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
      at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
      at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
      at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
      at org.mortbay.jetty.Server.handle(Server.java:326)
      at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
      at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
      at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
      at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:449)
      at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:455)
      at com.google.tracing.TraceContext.runInContext(TraceContext.java:695)
      at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:333)
      at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:325)
      at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:453)
      at java.lang.Thread.run(Thread.java:679)
  Caused by: java.lang.ClassNotFoundException: org.w3c.dom.ElementTraversal
      at com.google.appengine.runtime.Request.process-240c2ffe1bf8ddba(Request.java)
      ... 44 more
  C 2012-04-19 10:31:06.812
  Uncaught exception from servlet
  java.lang.NoClassDefFoundError: org/w3c/dom/ElementTraversal
      at com.google.appengine.runtime.Request.process-240c2ffe1bf8ddba(Request.java)
      at java.lang.ClassLoader.defineClass1(Native Method)
      at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
      at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
      at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
      at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:616)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
      at org.apache.xerces.parsers.AbstractDOMParser.startDocument(Unknown Source)
      at org.apache.xerces.impl.dtd.XMLDTDValidator.startDocument(Unknown Source)
      at org.apache.xerces.impl.XMLDocumentScannerImpl.startEntity(Unknown Source)
      at org.apache.xerces.impl.XMLVersionDetector.startDocumentParsing(Unknown Source)
      at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
      at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
      at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
      at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
      at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
      at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:121)
      at javax.jdo.JDOHelper.readNamedPMFProperties(JDOHelper.java:1407)
      at javax.jdo.JDOHelper.getNamedPMFProperties(JDOHelper.java:1286)
      at javax.jdo.JDOHelper.getPropertiesFromJdoconfig(JDOHelper.java:1232)
      at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:1079)
      at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:914)
      at com.cloudnotify.server.c2dm.C2DMessaging.getPMF(C2DMessaging.java:103)
      at com.cloudnotify.server.servlet.RequestInfo.initDevices(RequestInfo.java:225)
      at com.cloudnotify.server.servlet.RequestInfo.processRequest(RequestInfo.java:183)
      at com.cloudnotify.server.servlet.RegisterServlet.doPost(RegisterServlet.java:100)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
      at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
      at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
      at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
      at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
      at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
      at org.mortbay.jetty.Server.handle(Server.java:326)
      at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
      at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
      at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
      at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:449)
      at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:455)
      at com.google.tracing.TraceContext.runInContext(TraceContext.java:695)
      at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:333)
      at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:325)
      at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:453)
      at java.lang.Thread.run(Thread.java:679)
  Caused by: java.lang.ClassNotFoundException: org.w3c.dom.ElementTraversal
      at com.google.appengine.runtime.Request.process-240c2ffe1bf8ddba(Request.java)
      ... 44 more
  
  
  Thanks all 
  </code></pre>