Thanks Alejandro.
You example really helped me understand how this should work. Now I
know that it's better to use DTO.
I just tried to create two classes and use Dozer library but when I'm
trying to instantiate it on my server i'm getting this error:
SEVERE: [1245796455609000] javax.servlet.ServletContext log: Exception
while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method
'public abstract com.athena.client.entities.Person
com.athena.client.GreetingService.getPerson
(com.athena.client.entities.Person)' threw an unexpected exception:
java.lang.NoClassDefFoundError: org/dozer/DozerBeanMapper
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 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
$ApiProxyHandler.handle(JettyContainerService.java:306)
at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:313)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
at org.mortbay.jetty.HttpConnection$RequestHandler.content
(HttpConnection.java:844)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:205)
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.NoClassDefFoundError: org/dozer/DozerBeanMapper
at com.athena.converters.PersonConverter.<clinit>
(PersonConverter.java:11)
at com.athena.server.GreetingServiceImpl.getPerson
(GreetingServiceImpl.java:39)
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.gwt.user.server.rpc.RPC.invokeAndEncodeResponse
(RPC.java:527)
... 25 more
Do you know what can cause that problem? I tried to include all
libraries that you have in your project but still no luck.
Thanks
Max
On Jun 22, 6:57 am, "Alejandro D. Garin" <[email protected]> wrote:
> Hi,
>
> I wrote a little example with source code, have a look at:
>
> http://puntosoft2k.appspot.com/gwt_gae_example.html
>
> Please tell me if was usefull to you.
>
> Thanks.
>
> On Thu, Jun 18, 2009 at 5:43 PM, Max <[email protected]> wrote:
>
> > To learn GWT and Google AppEngine (GAE) I'm trying to create a simple
> > application using GWT with two classes (entities). In this application
> > one object, let's say Student, encapsulates Array/List of other
> > objects, say Classes and Books. Then it creates list of Students and
> > sends it to Java code on GAE and stores it to the data store. Then I'm
> > planning to retrieve these data back and send it to GWT.
>
> > Question: is it possible to do this kind of stuff using GWT + GAE +
> > Google DataStore? Are there any examples/tutorials of using all these
> > technologies at once?
>
>
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