dependencies on GWT project in eclipse gives exception..whats problem?

[Pratik]

Hello,
I've created a 'new web application project' in eclipse and also added
a dependency of another Java project on it. It compiles successfully,
but while starting built in server it gives exception as
WARNING: failed
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext@d8ddc6{/,D:
\workspace\Work\er\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:147)
at
com.google.appengine.tools.development.AbstractContainerService.startup
(AbstractContainerService.java:115)
at com.google.appengine.tools.development.DevAppServerImpl.start
(DevAppServerImpl.java:205)
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:590)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:397)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
May 28, 2009 6:52:55 PM com.google.apphosting.utils.jetty.JettyLogger
warn
WARNING: 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:142)
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:147)
at
com.google.appengine.tools.development.AbstractContainerService.startup
(AbstractContainerService.java:115)
at com.google.appengine.tools.development.DevAppServerImpl.start
(DevAppServerImpl.java:205)
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:590)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:397)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
May 28, 2009 6:52:55 PM com.google.apphosting.utils.jetty.JettyLogger
warn
WARNING: failed JettyContainerService$ApiProxyHandler@aa7745
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:147)
at
com.google.appengine.tools.development.AbstractContainerService.startup
(AbstractContainerService.java:115)
at com.google.appengine.tools.development.DevAppServerImpl.start
(DevAppServerImpl.java:205)
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:590)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:397)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
May 28, 2009 6:52:55 PM com.google.apphosting.utils.jetty.JettyLogger
warn
WARNING: 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:142)
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:147)
at
com.google.appengine.tools.development.AbstractContainerService.startup
(AbstractContainerService.java:115)
at com.google.appengine.tools.development.DevAppServerImpl.start
(DevAppServerImpl.java:205)
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:590)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:397)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
May 28, 2009 6:52:55 PM com.google.apphosting.utils.jetty.JettyLogger
warn
WARNING: 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:147)
at
com.google.appengine.tools.development.AbstractContainerService.startup
(AbstractContainerService.java:115)
at com.google.appengine.tools.development.DevAppServerImpl.start
(DevAppServerImpl.java:205)
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:590)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:397)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
May 28, 2009 6:52:55 PM com.google.apphosting.utils.jetty.JettyLogger
warn
WARNING: 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:142)
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:147)
at
com.google.appengine.tools.development.AbstractContainerService.startup
(AbstractContainerService.java:115)
at com.google.appengine.tools.development.DevAppServerImpl.start
(DevAppServerImpl.java:205)
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:590)
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/

[Rajeev Dayal]

There are a couple things to be aware of here.

There are some issues with having a WebApp project depend on a Java project. The crux of the problem is that the artifacts from the Java project are not automatically copied over to the WebApp's war directory. See the following thread for more information:

http://groups.google.com/group/Google-Web-Toolkit/browse_thread/thread/951499c5773693c9

Another problem may be that you're explicitly including Xerces as part of your WebApp project libraries (or maybe one of the libraries that you're using bundles Xerces). There is no need to deploy your own Xerces library; one is already available to the platform, and adding your own can cause ClassLoading issues.