GWT with Google App Engine, Stockwatcher Project: Error 404 in Hosted Browser

[Marc]

Hello,

i started developing gwt apps a few days ago, so i am not a very good
java developer.

I started with the tutorial "Stockwatcher", everything was working
fine, also the Client Server
Communication. At this time I was using the "Google App Engine".
I customized this project and disabled the "Use Google App Engine"
Button because I wanted to try
other packages.
Now I want to go back to the Google App Engine, because I want to
publish my project on the google Servers.

But I got Errors. So I made a new Eclipse Workingspace, downloaded the
"Stockwatcher" project and tried to
compile the sample project without any modifications, but it doesn't
work.
When I disable the Google App Engine, my gwt app is displayed without
problems in the Hosted Browser.

When I am using the Google App Engine, I get the error.
When I Deploy the application to App Engine, its working on the google
servers.

I tried to remove and reinstall all java related driver, but no
change.

I am using the newest Releases of all Software parts, downloaded a few
days ago:
Windows XP SP3, latest securitie packets installed
Eclipse: Galileo, Build id: 20090920-1017
Java: jdk-6u16-javafx-1_2_1-windows-i586.exe
Google App Engine 1.2.6, installed with Eclipse - help - install new
software
GWT 1.7.1

thanks for reading ;-)

My Error Message:



30.10.2009 23:45:57 com.google.apphosting.utils.jetty.JettyLogger warn
WARNUNG: failed
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext@b5a795{/,D:
\EclipseWS\StockWatcher\war}
javax.xml.parsers.FactoryConfigurationError: Provider
org.apache.xerces.jaxp.SAXParserFactoryImpl not found
at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
at org.mortbay.xml.XmlParser.setValidating(XmlParser.java:92)
at org.mortbay.xml.XmlParser.<init>(XmlParser.java:84)
at org.mortbay.jetty.webapp.TagLibConfiguration.configureWebApp
(TagLibConfiguration.java:202)
at org.mortbay.jetty.webapp.WebAppContext.startContext
(WebAppContext.java:1215)
at org.mortbay.jetty.handler.ContextHandler.doStart
(ContextHandler.java:500)
at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:
448)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at org.mortbay.jetty.handler.HandlerWrapper.doStart
(HandlerWrapper.java:117)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at org.mortbay.jetty.handler.HandlerWrapper.doStart
(HandlerWrapper.java:117)
at org.mortbay.jetty.Server.doStart(Server.java:217)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at
com.google.appengine.tools.development.JettyContainerService.startContainer
(JettyContainerService.java:181)
at
com.google.appengine.tools.development.AbstractContainerService.startup
(AbstractContainerService.java:116)
at com.google.appengine.tools.development.DevAppServerImpl.start
(DevAppServerImpl.java:217)
at com.google.appengine.tools.development.gwt.AppEngineLauncher.start
(AppEngineLauncher.java:86)
at com.google.gwt.dev.HostedMode.doStartUpServer(HostedMode.java:365)
at com.google.gwt.dev.HostedModeBase.startUp(HostedModeBase.java:589)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:397)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
30.10.2009 23:45:57 com.google.apphosting.utils.jetty.JettyLogger warn
WARNUNG: Nested in javax.xml.parsers.FactoryConfigurationError:
Provider org.apache.xerces.jaxp.SAXParserFactoryImpl not found:
java.lang.ClassNotFoundException:
org.apache.xerces.jaxp.SAXParserFactoryImpl
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
com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass
(IsolatedAppClassLoader.java:151)
at java.lang.ClassLoader.loadClass(Unknown Source)
at javax.xml.parsers.FactoryFinder.getProviderClass(Unknown Source)
at javax.xml.parsers.FactoryFinder.newInstance(Unknown Source)
at javax.xml.parsers.FactoryFinder.findJarServiceProvider(Unknown
Source)
at javax.xml.parsers.FactoryFinder.find(Unknown Source)
at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
at org.mortbay.xml.XmlParser.setValidating(XmlParser.java:92)
at org.mortbay.xml.XmlParser.<init>(XmlParser.java:84)
at org.mortbay.jetty.webapp.TagLibConfiguration.configureWebApp
(TagLibConfiguration.java:202)
at org.mortbay.jetty.webapp.WebAppContext.startContext
(WebAppContext.java:1215)
at org.mortbay.jetty.handler.ContextHandler.doStart
(ContextHandler.java:500)
at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:
448)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at org.mortbay.jetty.handler.HandlerWrapper.doStart
(HandlerWrapper.java:117)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at org.mortbay.jetty.handler.HandlerWrapper.doStart
(HandlerWrapper.java:117)
at org.mortbay.jetty.Server.doStart(Server.java:217)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at
com.google.appengine.tools.development.JettyContainerService.startContainer
(JettyContainerService.java:181)
at
com.google.appengine.tools.development.AbstractContainerService.startup
(AbstractContainerService.java:116)
at com.google.appengine.tools.development.DevAppServerImpl.start
(DevAppServerImpl.java:217)
at com.google.appengine.tools.development.gwt.AppEngineLauncher.start
(AppEngineLauncher.java:86)
at com.google.gwt.dev.HostedMode.doStartUpServer(HostedMode.java:365)
at com.google.gwt.dev.HostedModeBase.startUp(HostedModeBase.java:589)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:397)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
30.10.2009 23:45:57 com.google.apphosting.utils.jetty.JettyLogger warn
WARNUNG: failed JettyContainerService$ApiProxyHandler@d4ce6f
javax.xml.parsers.FactoryConfigurationError: Provider
org.apache.xerces.jaxp.SAXParserFactoryImpl not found
at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
at org.mortbay.xml.XmlParser.setValidating(XmlParser.java:92)
at org.mortbay.xml.XmlParser.<init>(XmlParser.java:84)
at org.mortbay.jetty.webapp.TagLibConfiguration.configureWebApp
(TagLibConfiguration.java:202)
at org.mortbay.jetty.webapp.WebAppContext.startContext
(WebAppContext.java:1215)
at org.mortbay.jetty.handler.ContextHandler.doStart
(ContextHandler.java:500)
at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:
448)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at org.mortbay.jetty.handler.HandlerWrapper.doStart
(HandlerWrapper.java:117)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at org.mortbay.jetty.handler.HandlerWrapper.doStart
(HandlerWrapper.java:117)
at org.mortbay.jetty.Server.doStart(Server.java:217)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at
com.google.appengine.tools.development.JettyContainerService.startContainer
(JettyContainerService.java:181)
at
com.google.appengine.tools.development.AbstractContainerService.startup
(AbstractContainerService.java:116)
at com.google.appengine.tools.development.DevAppServerImpl.start
(DevAppServerImpl.java:217)
at com.google.appengine.tools.development.gwt.AppEngineLauncher.start
(AppEngineLauncher.java:86)
at com.google.gwt.dev.HostedMode.doStartUpServer(HostedMode.java:365)
at com.google.gwt.dev.HostedModeBase.startUp(HostedModeBase.java:589)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:397)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
30.10.2009 23:45:57 com.google.apphosting.utils.jetty.JettyLogger warn
WARNUNG: Nested in javax.xml.parsers.FactoryConfigurationError:
Provider org.apache.xerces.jaxp.SAXParserFactoryImpl not found:
java.lang.ClassNotFoundException:
org.apache.xerces.jaxp.SAXParserFactoryImpl
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
com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass
(IsolatedAppClassLoader.java:151)
at java.lang.ClassLoader.loadClass(Unknown Source)
at javax.xml.parsers.FactoryFinder.getProviderClass(Unknown Source)
at javax.xml.parsers.FactoryFinder.newInstance(Unknown Source)
at javax.xml.parsers.FactoryFinder.findJarServiceProvider(Unknown
Source)
at javax.xml.parsers.FactoryFinder.find(Unknown Source)
at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
at org.mortbay.xml.XmlParser.setValidating(XmlParser.java:92)
at org.mortbay.xml.XmlParser.<init>(XmlParser.java:84)
at org.mortbay.jetty.webapp.TagLibConfiguration.configureWebApp
(TagLibConfiguration.java:202)
at org.mortbay.jetty.webapp.WebAppContext.startContext
(WebAppContext.java:1215)
at org.mortbay.jetty.handler.ContextHandler.doStart
(ContextHandler.java:500)
at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:
448)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at org.mortbay.jetty.handler.HandlerWrapper.doStart
(HandlerWrapper.java:117)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at org.mortbay.jetty.handler.HandlerWrapper.doStart
(HandlerWrapper.java:117)
at org.mortbay.jetty.Server.doStart(Server.java:217)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at
com.google.appengine.tools.development.JettyContainerService.startContainer
(JettyContainerService.java:181)
at
com.google.appengine.tools.development.AbstractContainerService.startup
(AbstractContainerService.java:116)
at com.google.appengine.tools.development.DevAppServerImpl.start
(DevAppServerImpl.java:217)
at com.google.appengine.tools.development.gwt.AppEngineLauncher.start
(AppEngineLauncher.java:86)
at com.google.gwt.dev.HostedMode.doStartUpServer(HostedMode.java:365)
at com.google.gwt.dev.HostedModeBase.startUp(HostedModeBase.java:589)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:397)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
30.10.2009 23:45:57 com.google.apphosting.utils.jetty.JettyLogger warn
WARNUNG: Error starting handlers
javax.xml.parsers.FactoryConfigurationError: Provider
org.apache.xerces.jaxp.SAXParserFactoryImpl not found
at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
at org.mortbay.xml.XmlParser.setValidating(XmlParser.java:92)
at org.mortbay.xml.XmlParser.<init>(XmlParser.java:84)
at org.mortbay.jetty.webapp.TagLibConfiguration.configureWebApp
(TagLibConfiguration.java:202)
at org.mortbay.jetty.webapp.WebAppContext.startContext
(WebAppContext.java:1215)
at org.mortbay.jetty.handler.ContextHandler.doStart
(ContextHandler.java:500)
at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:
448)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at org.mortbay.jetty.handler.HandlerWrapper.doStart
(HandlerWrapper.java:117)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at org.mortbay.jetty.handler.HandlerWrapper.doStart
(HandlerWrapper.java:117)
at org.mortbay.jetty.Server.doStart(Server.java:217)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at
com.google.appengine.tools.development.JettyContainerService.startContainer
(JettyContainerService.java:181)
at
com.google.appengine.tools.development.AbstractContainerService.startup
(AbstractContainerService.java:116)
at com.google.appengine.tools.development.DevAppServerImpl.start
(DevAppServerImpl.java:217)
at com.google.appengine.tools.development.gwt.AppEngineLauncher.start
(AppEngineLauncher.java:86)
at com.google.gwt.dev.HostedMode.doStartUpServer(HostedMode.java:365)
at com.google.gwt.dev.HostedModeBase.startUp(HostedModeBase.java:589)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:397)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
30.10.2009 23:45:57 com.google.apphosting.utils.jetty.JettyLogger warn
WARNUNG: Nested in javax.xml.parsers.FactoryConfigurationError:
Provider org.apache.xerces.jaxp.SAXParserFactoryImpl not found:
java.lang.ClassNotFoundException:
org.apache.xerces.jaxp.SAXParserFactoryImpl
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
com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass
(IsolatedAppClassLoader.java:151)
at java.lang.ClassLoader.loadClass(Unknown Source)
at javax.xml.parsers.FactoryFinder.getProviderClass(Unknown Source)
at javax.xml.parsers.FactoryFinder.newInstance(Unknown Source)
at javax.xml.parsers.FactoryFinder.findJarServiceProvider(Unknown
Source)
at javax.xml.parsers.FactoryFinder.find(Unknown Source)
at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
at org.mortbay.xml.XmlParser.setValidating(XmlParser.java:92)
at org.mortbay.xml.XmlParser.<init>(XmlParser.java:84)
at org.mortbay.jetty.webapp.TagLibConfiguration.configureWebApp
(TagLibConfiguration.java:202)
at org.mortbay.jetty.webapp.WebAppContext.startContext
(WebAppContext.java:1215)
at org.mortbay.jetty.handler.ContextHandler.doStart
(ContextHandler.java:500)
at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:
448)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at org.mortbay.jetty.handler.HandlerWrapper.doStart
(HandlerWrapper.java:117)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at org.mortbay.jetty.handler.HandlerWrapper.doStart
(HandlerWrapper.java:117)
at org.mortbay.jetty.Server.doStart(Server.java:217)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at
com.google.appengine.tools.development.JettyContainerService.startContainer
(JettyContainerService.java:181)
at
com.google.appengine.tools.development.AbstractContainerService.startup
(AbstractContainerService.java:116)
at com.google.appengine.tools.development.DevAppServerImpl.start
(DevAppServerImpl.java:217)
at com.google.appengine.tools.development.gwt.AppEngineLauncher.start
(AppEngineLauncher.java:86)
at com.google.gwt.dev.HostedMode.doStartUpServer(HostedMode.java:365)
at com.google.gwt.dev.HostedModeBase.startUp(HostedModeBase.java:589)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:397)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
The server is running at http://localhost:8080/

[Marc]

Solution: i was formating my harddisk and setting up windows, and all
the other stuff.

Before I tried to deinstall all Java related things (the Java
SDK, ...)
I deleted the eclipse.
And then, after a restart, I tried to reinstall the whole thing.
All other java programms were running without problems - except my GWT
thing
(also a new project) had the same problem.

With my new setup also my modyfied programm was working fine.