Hi Sajil,
I believe the error you're receiving is due to a ClassCastException in your
server-side code. From the exception stack trace:
Caused by: java.lang.ClassCastException:
net.sf.hibernate.dialect.MySQLDialect cannot be cast to
org.hibernate.dialect.Dialect
at org.hibernate.dialect.DialectFactory.buildDialect
(DialectFactory.java:101)
... 34 more
java.lang.NullPointerException
at com.bt.web.server.EventManager.createAndStoreEvent
(EventManager.java:22)
at com.bt.web.server.GreetingServiceImpl.greetServer
(GreetingServiceImpl.java:23)
As far as launch configurations are concerned, you should be good to go now
that the Google App Engine option has been de-selected.
Hope that helps,
-Sumit Chandel
On Mon, May 18, 2009 at 11:16 PM, sajil <[email protected]> wrote:
>
>
>
> When I am trying to connect to MySQL from my GWT servlet, I am getting
> an exception :
>
> java.security.AccessControlException: access denied
> (java.lang.RuntimePermission modifyThreadGroup)
>
> I searched the group and found the solution. I went and disabled the
> Google App Engine. But now I have problem with my class loading. It
> seams the GWT class loader is conflicting with Eclipse class loader. I
> get the following error:
>
> May 18, 2009 11:10:30 PM net.sf.hibernate.dialect.Dialect <init>
> INFO: Using dialect: net.sf.hibernate.dialect.MySQLDialect
> Initial SessionFactory creation
> failed.org.hibernate.HibernateException: Could not instantiate dialect
> class
> org.hibernate.HibernateException: Could not instantiate dialect class
> at org.hibernate.dialect.DialectFactory.buildDialect
> (DialectFactory.java:107)
> at org.hibernate.dialect.DialectFactory.buildDialect
> (DialectFactory.java:65)
> at org.hibernate.cfg.SettingsFactory.determineDialect
> (SettingsFactory.java:460)
> at org.hibernate.cfg.SettingsFactory.buildSettings
> (SettingsFactory.java:155)
> at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:
> 2101)
> at org.hibernate.cfg.Configuration.buildSessionFactory
> (Configuration.java:1325)
> at com.bt.web.server.HibernateUtil.<clinit>(HibernateUtil.java:13)
> at com.bt.web.server.EventManager.createAndStoreEvent
> (EventManager.java:22)
> at com.bt.web.server.GreetingServiceImpl.greetServer
> (GreetingServiceImpl.java:23)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke
> (NativeMethodAccessorImpl.java:39)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke
> (DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse
> (RPC.java:527)
> at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall
> (RemoteServiceServlet.java:166)
> at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost
> (RemoteServiceServlet.java:86)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
> at
> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
> 487)
> at org.mortbay.jetty.servlet.ServletHandler.handle
> (ServletHandler.java:362)
> 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:729)
> at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
> 405)
> at org.mortbay.jetty.handler.HandlerWrapper.handle
> (HandlerWrapper.java:152)
> at org.mortbay.jetty.handler.RequestLogHandler.handle
> (RequestLogHandler.java:49)
> at org.mortbay.jetty.handler.HandlerWrapper.handle
> (HandlerWrapper.java:152)
> at org.mortbay.jetty.Server.handle(Server.java:324)
> at
> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
> 505)
> at org.mortbay.jetty.HttpConnection$RequestHandler.content
> (HttpConnection.java:843)
> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:205)
> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
> at org.mortbay.io.nio.SelectChannelEndPoint.run
> (SelectChannelEndPoint.java:396)
> at org.mortbay.thread.QueuedThreadPool$PoolThread.run
> (QueuedThreadPool.java:488)
> Caused by: java.lang.ClassCastException:
> net.sf.hibernate.dialect.MySQLDialect cannot be cast to
> org.hibernate.dialect.Dialect
> at org.hibernate.dialect.DialectFactory.buildDialect
> (DialectFactory.java:101)
> ... 34 more
> java.lang.NullPointerException
> at com.bt.web.server.EventManager.createAndStoreEvent
> (EventManager.java:22)
> at com.bt.web.server.GreetingServiceImpl.greetServer
> (GreetingServiceImpl.java:23)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke
> (NativeMethodAccessorImpl.java:39)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke
> (DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse
> (RPC.java:527)
> at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall
> (RemoteServiceServlet.java:166)
> at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost
> (RemoteServiceServlet.java:86)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
> at
> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
> 487)
> at org.mortbay.jetty.servlet.ServletHandler.handle
> (ServletHandler.java:362)
> 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:729)
> at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
> 405)
> at org.mortbay.jetty.handler.HandlerWrapper.handle
> (HandlerWrapper.java:152)
> at org.mortbay.jetty.handler.RequestLogHandler.handle
> (RequestLogHandler.java:49)
> at org.mortbay.jetty.handler.HandlerWrapper.handle
> (HandlerWrapper.java:152)
> at org.mortbay.jetty.Server.handle(Server.java:324)
> at
> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
> 505)
> at org.mortbay.jetty.HttpConnection$RequestHandler.content
> (HttpConnection.java:843)
> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:205)
> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
> at org.mortbay.io.nio.SelectChannelEndPoint.run
> (SelectChannelEndPoint.java:396)
> at org.mortbay.thread.QueuedThreadPool$PoolThread.run
> (QueuedThreadPool.java:488)
>
>
> Please help
>
> Sajil
>
> >
>
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