java.lang.NoClassDefFoundError, it probably well known but I cannot found the solution....

Tue, 11 May 2010 10:19:04 -0700 

HI, I just use the class in another JAR, eclipse show no compilation
error, and GWT compilation is success, why I still get following
error? BTW, I start the application using eclipse GWT plugin.

May 11, 2010 5:17:36 PM com.google.apphosting.utils.jetty.JettyLogger
warn
WARNING: Nested in javax.servlet.ServletException: init:
java.lang.NoClassDefFoundError: hk/com/carfield/core/Context
        at
hk.com.carfield.server.InternetfolderServiceImpl.<init>(InternetfolderServiceImpl.java:
27)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
        at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:
57)
        at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:
45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
        at java.lang.Class.newInstance0(Class.java:372)
        at java.lang.Class.newInstance(Class.java:325)
        at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
        at
org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:
339)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
463)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1093)
        at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
51)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
        at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:
43)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
        at
com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:
121)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
        at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
360)
        at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
216)
        at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
181)
        at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
712)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
        at
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:
70)
        at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
139)
        at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:352)
        at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
139)
        at org.mortbay.jetty.Server.handle(Server.java:313)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
        at org.mortbay.jetty.HttpConnection
$RequestHandler.content(HttpConnection.java:844)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
        at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
396)
        at org.mortbay.thread.BoundedThreadPool
$PoolThread.run(BoundedThreadPool.java:442)
Caused by: java.lang.ClassNotFoundException:
hk.com.carfield.core.Context
        at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:319)
        at
com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:
151)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:264)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332)
        ... 34 more
May 11, 2010 5:17:36 PM com.google.apphosting.utils.jetty.JettyLogger
warn
WARNING: Nested in javax.servlet.ServletException: init:
java.lang.NoClassDefFoundError: hk/com/carfield/core/Context
        at
hk.com.carfield.server.InternetfolderServiceImpl.<init>(InternetfolderServiceImpl.java:
27)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
        at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:
57)
        at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:
45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
        at java.lang.Class.newInstance0(Class.java:372)
        at java.lang.Class.newInstance(Class.java:325)
        at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
        at
org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:
339)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
463)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1093)
        at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
51)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
        at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:
43)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
        at
com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:
121)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
        at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
360)
        at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
216)
        at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
181)
        at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
712)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
        at
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:
70)
        at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
139)
        at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:352)
        at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
139)
        at org.mortbay.jetty.Server.handle(Server.java:313)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
        at org.mortbay.jetty.HttpConnection
$RequestHandler.content(HttpConnection.java:844)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
        at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
396)
        at org.mortbay.thread.BoundedThreadPool
$PoolThread.run(BoundedThreadPool.java:442)
May 11, 2010 5:17:36 PM com.google.apphosting.utils.jetty.JettyLogger
warn
WARNING: /gtwinternetfolder/internetfolder
java.lang.NoClassDefFoundError: hk/com/carfield/core/Context
        at
hk.com.carfield.server.InternetfolderServiceImpl.<init>(InternetfolderServiceImpl.java:
27)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
        at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:
57)
        at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:
45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
        at java.lang.Class.newInstance0(Class.java:372)
        at java.lang.Class.newInstance(Class.java:325)
        at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
        at
org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:
339)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
463)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1093)
        at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
51)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
        at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:
43)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
        at
com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:
121)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
        at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
360)
        at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
216)
        at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
181)
        at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
712)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
        at
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:
70)
        at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
139)
        at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:352)
        at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
139)
        at org.mortbay.jetty.Server.handle(Server.java:313)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
        at org.mortbay.jetty.HttpConnection
$RequestHandler.content(HttpConnection.java:844)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
        at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
396)
        at org.mortbay.thread.BoundedThreadPool
$PoolThread.run(BoundedThreadPool.java:442)
May 11, 2010 5:17:36 PM com.google.apphosting.utils.jetty.JettyLogger
warn
WARNING: /gtwinternetfolder/internetfolder
java.lang.NoClassDefFoundError: hk/com/carfield/core/Context
        at
hk.com.carfield.server.InternetfolderServiceImpl.<init>(InternetfolderServiceImpl.java:
27)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
        at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:
57)
        at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:
45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
        at java.lang.Class.newInstance0(Class.java:372)
        at java.lang.Class.newInstance(Class.java:325)
        at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
        at
org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:
339)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
463)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1093)
        at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
51)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
        at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:
43)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
        at
com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:
121)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
        at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
360)
        at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
216)
        at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
181)
        at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
712)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
        at
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:
70)
        at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
139)
        at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:352)
        at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
139)
        at org.mortbay.jetty.Server.handle(Server.java:313)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
        at org.mortbay.jetty.HttpConnection
$RequestHandler.content(HttpConnection.java:844)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
        at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
396)
        at org.mortbay.thread.BoundedThreadPool
$PoolThread.run(BoundedThreadPool.java:442)
Caused by: java.lang.ClassNotFoundException:
hk.com.carfield.core.Context
        at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:319)
        at
com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:
151)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:264)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332)
        ... 34 more

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