Hey guys,
I created an app where a user can upload an xml, I display the nodes
in a GWT table then the user selects the nodes he/she wants to
download. Sounds easy, works perfectly in hosted mode.
I use only the base xml parsing, no 3rd party jars in the project
(aside from commons-fileupload-1.2.1.jar, commons-io-1.3.2.jar,
gxt-2.2.3-gwt22.jar).
Here's the code I use for parsing the XML:
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
...
public static Document getXml(InputStream stream) throws
ParserConfigurationException, SAXException, IOException {
DocumentBuilder parser =
DocumentBuilderFactory.newInstance().newDocumentBuilder();
// Parse xml data
Document xml = parser.parse(stream);
return xml;
}
It's working perfectly in hosted mode, but when I upload it to the
appengine servers I get the following exception:
javax.servlet.ServletException: java.lang.RuntimeException:
java.lang.ClassNotFoundException:
com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl
at
com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:
240)
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
$RequestHandler.headerComplete(HttpConnection.java:923)
at
com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:
76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:
135)
at
com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:
260)
at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$2.handleRequest(RuntimePb.java:9669)
at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:
439)
at com.google.net.rpc.impl.Server$RpcTask.runInContext(Server.java:
573)
at com.google.tracing.TraceContext$TraceContextRunnable
$1.run(TraceContext.java:448)
at com.google.tracing.TraceContext.runInContext(TraceContext.java:
688)
at com.google.tracing.TraceContext
$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:
326)
at com.google.tracing.TraceContext
$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:
318)
at com.google.tracing.TraceContext
$TraceContextRunnable.run(TraceContext.java:446)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:
1110)
at java.util.concurrent.ThreadPoolExecutor
$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:636)
Caused by: java.lang.RuntimeException:
java.lang.ClassNotFoundException:
com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl
at
com.google.apphosting.runtime.jetty.SessionManager.deserialize(SessionManager.java:
421)
at
com.google.apphosting.runtime.jetty.SessionManager.createSessionFromEntity(SessionManager.java:
382)
at
com.google.apphosting.runtime.jetty.SessionManager.loadSession(SessionManager.java:
320)
at
com.google.apphosting.runtime.jetty.SessionManager.getSession(SessionManager.java:
288)
at
org.mortbay.jetty.servlet.AbstractSessionManager.getHttpSession(AbstractSessionManager.java:
237)
at
org.mortbay.jetty.servlet.SessionHandler.setRequestedId(SessionHandler.java:
246)
at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
136)
at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
418)
at
com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:
238)
... 19 more
Caused by: java.lang.ClassNotFoundException:
com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl
at
com.google.apphosting.runtime.security.UserClassLoader.loadClass(UserClassLoader.java:
445)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at com.google.apphosting.runtime.jetty.SessionManager
$DelegatingObjectInputStream.resolveClass(SessionManager.java:476)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:
1592)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:
1513)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:
1749)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368)
at java.util.HashMap.readObject(HashMap.java:1047)
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:616)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:
991)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:
1865)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:
1770)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368)
at
com.google.apphosting.runtime.jetty.SessionManager.deserialize(SessionManager.java:
417)
... 28 more
I have a suspicion, that it's not even related to the xml parsing(the
class it can't find says otherwise tho) because after I stripped
EVERYTHING from my server side classes, only the method stubs
remained, commented the imports and it still throws this exception.
It's only an empty skeleton and produces this weird exception that it
absolutely shouldn't.
Please help me, I can't seem to find any solutions. :S
Richie
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