gwt+hibernate集成的时候出现access denied（拒绝访问）异常_gwt吧

javax.servlet.ServletContext log: Exception while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract com.topsoft.gwt.client.User com.topsoft.gwt.client.HellowordService.helloUser()' threw an unexpected exception: java.lang.ExceptionInInitializerError
     at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:378)
     at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:581)
     at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:207)
     at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:243)
     at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
     at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
     at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
     at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:58)
     at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
     at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
     at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
     at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
     at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
     at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
     at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
     at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
     at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
     at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
     at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70)
     at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
     at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:349)
     at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
     at org.mortbay.jetty.Server.handle(Server.java:326)

     at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
     at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
     at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
     at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
     at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
     at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
     at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: java.lang.ExceptionInInitializerError
     at com.topsoft.gwt.server.HibernateUtil.<clinit>(HibernateUtil.java:17)
     at com.topsoft.gwt.server.HellowordServiceImpl.helloUser(HellowordServiceImpl.java:48)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:100)
     at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:562)
     ... 30 more
Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission accessClassInPackage.sun.io)
     at java.security.AccessControlContext.checkPermission(Unknown Source)
     at java.security.AccessController.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkPermission(Unknown Source)
     at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:166)
     at java.lang.SecurityManager.checkPackageAccess(Unknown Source)
     at java.lang.ClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.lang.ClassLoader.checkPackageAccess(Unknown Source)
     at com.ibm.db2.jcc.b.a.<init>(a.java:238)
     at com.ibm.db2.jcc.b.b.a(b.java:1624)
     at com.ibm.db2.jcc.c.p.a(p.java:350)
     at com.ibm.db2.jcc.c.p.<init>(p.java:404)
     at com.ibm.db2.jcc.b.b.<init>(b.java:256)
     at com.ibm.db2.jcc.DB2Driver.connect(DB2Driver.java:163)
     at java.sql.DriverManager.getConnection(Unknown Source)
     at java.sql.DriverManager.getConnection(Unknown Source)
     at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:110)
     at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:73)
     at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:1928)
     at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1211)
     at com.topsoft.gwt.server.HibernateUtil.<clinit>(HibernateUtil.java:12)
     ... 37 more

该异常是在
sessionFactory = new Configuration().configure().buildSessionFactory();
时发生的，但是我用test程序能够正确访问到数据库啊
是gwt和hibernate发生冲突？
求教高手帮忙！

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gwt+hibernate集成的时候出现access denied（拒绝访问）异常

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