Re: MySQL Connection
Hi, Im Using GWT + AppEng is that the problem here? Lets say I have an existing database which I want to use for my GWT application what is the possible solution you reckon ? On Tue, Sep 22, 2009 at 7:08 AM, Sripathi Krishnan < sripathi.krish...@gmail.com> wrote: > If you are using Google App Engine (separate from GWT), you *cannot* use > an external database. App Engine doesn't allow you to open socket > connections, and that is exactly what the getConnection() method does. > > --Sri > > > 2009/9/21 Chamira Fernando > > >> Hi All, >> >> I have the same problem when I connect to MySQL database, >> >> What I understand from the GWT doc, whatever server side scripts we >> have to in .server package and this will be on server side on host >> mode when we debug the application. >> >> here is the scenario >> >> I can get the data from the server side if there is no database >> connection, everything works fine, the moment I run database >> connection method >> >> I get errors! narrowing the problem i tried to load the class >> (Class.forName(DRIVER)) only.. it seems class is loaded (i get no >> errors) but the moment I run >> connection = DriverManager.getConnection(URL,USER,PASS); method will >> cause the problem .. if this is an sql error, should be caught ?? >> >> mind you >> my mysql connector is in proper dirs (otherwise I can't load DRIVER ). >> >> Do I need to set $catalina.home for hosted mode? then can someone help >> to do it (im using eclipse plugin) >> >> Can someone come up with an answer, prefer small script to >> understand... >> >> here is the stack trace I got >> >> Sep 21, 2009 12:05:02 PM >> com.google.appengine.tools.development.ApiProxyLocalImpl log >> SEVERE: [1253534702085000] javax.servlet.ServletContext log: Exception >> while dispatching incoming RPC call >> com.google.gwt.user.server.rpc.UnexpectedException: Service method >> 'public abstract java.lang.String >> com.pro.student.client.GreetingService.greetServer(java.lang.String)' >> threw an unexpected exception: java.lang.ExceptionInInitializerError >>at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure >> (RPC.java:360) >>at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse >> (RPC.java:546) >>at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall >> (RemoteServiceServlet.java:166) >>at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost >> (RemoteServiceServlet.java:86) >>at javax.servlet.http.HttpServlet.service(HttpServlet.java:713) >>at javax.servlet.http.HttpServlet.service(HttpServlet.java:806) >>at >> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java: >> 487) >>at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter >> (ServletHandler.java:1093) >>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:54) >>at org.mortbay.jetty.handler.HandlerWrapper.handle >> (HandlerWrapper.java:139) >>at com.google.appengine.tools.development.JettyContainerService >> $ApiProxyHandler.handle(JettyContainerService.java:313) >>at org.mortbay.jetty.handler.HandlerWrapper.handle >> (HandlerWrapper.java:139) >>at org.mortbay.jetty.Server.handle(Server.java:313) >>at >> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java: >> 506) >>at org.mortbay.jetty.HttpConnection$RequestHandler.content >> (HttpConnect
Re: MySQL Connection
Hi All, I have the same problem when I connect to MySQL database, What I understand from the GWT doc, whatever server side scripts we have to in .server package and this will be on server side on host mode when we debug the application. here is the scenario I can get the data from the server side if there is no database connection, everything works fine, the moment I run database connection method I get errors! narrowing the problem i tried to load the class (Class.forName(DRIVER)) only.. it seems class is loaded (i get no errors) but the moment I run connection = DriverManager.getConnection(URL,USER,PASS); method will cause the problem .. if this is an sql error, should be caught ?? mind you my mysql connector is in proper dirs (otherwise I can't load DRIVER ). Do I need to set $catalina.home for hosted mode? then can someone help to do it (im using eclipse plugin) Can someone come up with an answer, prefer small script to understand... here is the stack trace I got Sep 21, 2009 12:05:02 PM com.google.appengine.tools.development.ApiProxyLocalImpl log SEVERE: [1253534702085000] javax.servlet.ServletContext log: Exception while dispatching incoming RPC call com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract java.lang.String com.pro.student.client.GreetingService.greetServer(java.lang.String)' threw an unexpected exception: java.lang.ExceptionInInitializerError at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure (RPC.java:360) at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse (RPC.java:546) at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall (RemoteServiceServlet.java:166) at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost (RemoteServiceServlet.java:86) at javax.servlet.http.HttpServlet.service(HttpServlet.java:713) at javax.servlet.http.HttpServlet.service(HttpServlet.java:806) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java: 487) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1093) 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:54) at org.mortbay.jetty.handler.HandlerWrapper.handle (HandlerWrapper.java:139) at com.google.appengine.tools.development.JettyContainerService $ApiProxyHandler.handle(JettyContainerService.java:313) at org.mortbay.jetty.handler.HandlerWrapper.handle (HandlerWrapper.java:139) at org.mortbay.jetty.Server.handle(Server.java:313) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java: 506) at org.mortbay.jetty.HttpConnection$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.ExceptionInInitializerError at com.mysql.jdbc.NonRegisteringDriver.connect (NonRegisteringDriver.java:283) at java.sql.DriverManager.getConnection(DriverManager.java:525) at java.sql.DriverManager.getConnection(DriverManager.java:171) at com.pro.student.server.GreetingServiceImpl.db (GreetingServiceImpl.java:52) at com.pro.student.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:592) at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse (RPC.java:527) ... 27 more Caused by: java.security.AccessControlException: access denied (java.lang.RuntimeP
