未能建立Postgres數據庫和gwt之間的連接

我正在使用Postgres和gwt 2.0作爲我的一個應用程序。我面臨連接到數據庫的問題。當我嘗試連接它給出「ClassNotFoundException」。這裏是我所得到的，當我嘗試連接到數據庫：未能建立Postgres數據庫和gwt之間的連接
java.lang.ClassNotFoundException: org.postgresql.Driver 
    at java.net.URLClassLoader$1.run(URLClassLoader.java:200) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307) 
    at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:151) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252) 
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) 
    at java.lang.Class.forName0(Native Method) 
    at java.lang.Class.forName(Class.java:169) 
    at com.e.r.d.server.db.SQLManager.<init>(SQLManager.java:18) 
    at com.e.r.d.server.db.EntityRelationManager.<init>(EntityRelationManager.java:10) 
    at com.e.r.d.server.EntityRelationServiceImpl.<clinit>(EntityRelationServiceImpl.java:21) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513) 
    at java.lang.Class.newInstance0(Class.java:355) 
    at java.lang.Class.newInstance(Class.java:308) 
    at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153) 
    at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339) 
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:463) 
    at org.mortbay.jetty.servlet.ServletHandler$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) 
Mar 15, 2010 1:17:41 AM com.google.apphosting.utils.jetty.JettyLogger warn 
WARNING: Nested in javax.servlet.ServletException: init: 
java.lang.ExceptionInInitializerError 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513) 
    at java.lang.Class.newInstance0(Class.java:355) 
    at java.lang.Class.newInstance(Class.java:308) 
    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$PoolThread.run(BoundedThreadPool.java:442) 
Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.1) 
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323) 
    at java.security.AccessController.checkPermission(AccessController.java:546) 
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:532) 
    at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:166) 
    at java.lang.SecurityManager.checkExit(SecurityManager.java:744) 
    at java.lang.Runtime.exit(Runtime.java:88) 
    at java.lang.System.exit(System.java:906) 
    at com.e.r.d.server.db.SQLManager.<init>(SQLManager.java:22) 
    at com.e.r.d.server.db.EntityRelationManager.<init>(EntityRelationManager.java:10) 
    at com.e.r.d.server.EntityRelationServiceImpl.<clinit>(EntityRelationServiceImpl.java:21) 
    ... 33 more 
Mar 15, 2010 1:17:41 AM com.google.apphosting.utils.jetty.JettyLogger warn 
WARNING: Nested in java.lang.ExceptionInInitializerError: 
java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.1) 
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323) 
    at java.security.AccessController.checkPermission(AccessController.java:546) 
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:532) 
    at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:166) 
    at java.lang.SecurityManager.checkExit(SecurityManager.java:744) 
    at java.lang.Runtime.exit(Runtime.java:88) 
    at java.lang.System.exit(System.java:906) 
    at com.e.r.d.server.db.SQLManager.<init>(SQLManager.java:22) 
    at com.e.r.d.server.db.EntityRelationManager.<init>(EntityRelationManager.java:10) 
    at com.e.r.d.server.EntityRelationServiceImpl.<clinit>(EntityRelationServiceImpl.java:21) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513) 
    at java.lang.Class.newInstance0(Class.java:355) 
    at java.lang.Class.newInstance(Class.java:308) 
    at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153) 
    at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339) 
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:463) 
    at org.mortbay.jetty.servlet.ServletHandler$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) 
Mar 15, 2010 1:17:41 AM com.google.apphosting.utils.jetty.JettyLogger warn 
WARNING: Nested in javax.servlet.ServletException: init: 
java.lang.NoClassDefFoundError: Could not initialize class com.e.r.d.server.EntityRelationServiceImpl 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513) 
    at java.lang.Class.newInstance0(Class.java:355) 
    at java.lang.Class.newInstance(Class.java:308) 
    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$PoolThread.run(BoundedThreadPool.java:442) 
Mar 15, 2010 1:17:41 AM com.google.apphosting.utils.jetty.JettyLogger warn 
WARNING: /erd1/erpath 
java.lang.ExceptionInInitializerError 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513) 
    at java.lang.Class.newInstance0(Class.java:355) 
    at java.lang.Class.newInstance(Class.java:308) 
    at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153) 
    at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339) 
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:463) 
    at org.mortbay.jetty.servlet.ServletHandler$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.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.1) 
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323) 
    at java.security.AccessController.checkPermission(AccessController.java:546) 
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:532) 
    at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:166) 
    at java.lang.SecurityManager.checkExit(SecurityManager.java:744) 
    at java.lang.Runtime.exit(Runtime.java:88) 
    at java.lang.System.exit(System.java:906) 
    at com.e.r.d.server.db.SQLManager.<init>(SQLManager.java:22) 
    at com.e.r.d.server.db.EntityRelationManager.<init>(EntityRelationManager.java:10) 
    at com.e.r.d.server.EntityRelationServiceImpl.<clinit>(EntityRelationServiceImpl.java:21) 
    ... 33 more 
Mar 15, 2010 1:17:41 AM com.google.apphosting.utils.jetty.JettyLogger warn 
WARNING: Nested in java.lang.ExceptionInInitializerError: 
java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.1) 
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323) 
    at java.security.AccessController.checkPermission(AccessController.java:546) 
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:532) 
    at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:166) 
    at java.lang.SecurityManager.checkExit(SecurityManager.java:744) 
    at java.lang.Runtime.exit(Runtime.java:88) 
    at java.lang.System.exit(System.java:906) 
    at com.e.r.d.server.db.SQLManager.<init>(SQLManager.java:22) 
    at com.e.r.d.server.db.EntityRelationManager.<init>(EntityRelationManager.java:10) 
    at com.e.r.d.server.EntityRelationServiceImpl.<clinit>(EntityRelationServiceImpl.java:21) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513) 
    at java.lang.Class.newInstance0(Class.java:355) 
    at java.lang.Class.newInstance(Class.java:308) 
    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$PoolThread.run(BoundedThreadPool.java:442) 
Mar 15, 2010 1:17:41 AM com.google.apphosting.utils.jetty.JettyLogger warn 
WARNING: /erd1/erpath 
java.lang.NoClassDefFoundError: Could not initialize class com.e.r.d.server.EntityRelationServiceImpl 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513) 
    at java.lang.Class.newInstance0(Class.java:355) 
    at java.lang.Class.newInstance(Class.java:308) 
    at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153) 
    at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339) 
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:463) 
    at org.mortbay.jetty.servlet.ServletHandler$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)
我已經包括Postgres的jar文件到項目的構建路徑。
問：
是否有其他任何地方，我必須包括postgre？
在創建GWT項目時，我沒有取消選中應用程序引擎。這是個問題嗎？
有人能告訴我我做錯了什麼嗎？
任何輸入都會有很大的幫助。謝謝。
來源
2010-03-15 suprasad
我們可能需要更多關於你在哪裏運行這個應用程序的信息，但是你應該記住，對於大多數依賴項來說，jar需要在構建時和運行時在類路徑上。這通常意味着打包你的jar依賴到你的構建jar。
事實上，在你的stacktrace中有一些與appengine相關的東西讓我想知道你的運行時環境。我幾乎不知道appengine，但我不認爲它提供了一個postgresql實例。
來源
2010-03-15 02:32:40 elchuppa
謝謝。我認爲出了什麼問題。使用GWT應用引擎，我們不能使用不同的數據庫。一旦我取消它現在它工作正常。再次感謝您。 – suprasad 2010-03-15 03:10:41
未能建立Postgres數據庫和gwt之間的連接

回答

相關問題
