Re: RPC and server side classes

java.lang.NoClassDefFoundError: [Lcom/mycompany/myproject/data/FooDataClass; is not the same ClassNotFoundException, so perhaps you have a dependency or is not serializable or instanciable in runtime.

Is serializable? have final fields? have a default constructor?

2011/8/3 Mike Dee <mdichiappari@gmail.com>

I added a .gwt.xml file to the OldProject and inherited it from
NewUiProject.  Only the data objects (pojos) from the OldProject are
listed in the source path of the .gwt.xml.


On Aug 3, 11:29 am, Juan Pablo Gardella <gardellajuanpa...@gmail.com>
wrote:

> RPC only work as transport layer between client and server side, so you must
> put old project as a jar and define *.gwt.xml inside and define the module.
> In NewUiProject inherit it. You can't said that the POJO is only in server
> side if RPC layer try serialize/deseralize
>
> Juan
>

> 2011/8/3 Mike Dee <mdichiapp...@gmail.com>

>
>
>
>
>
>
>
> > I'm updating an existing web app to use GWT and encountering a problem
> > on server side.  A goal is to reuse the server side data classes,
> > which are stored in a separate Eclipse project.
>
> > I have two projects: OldProject, which has old data classes (as POJOs)
> > and NewUiProject, which is GWT.
>
> > If I put the OldProject POJOs in the NewUiProject, all is fine.  Of
> > course the POJOs don't fall under the "shared" directory, so I created
> > a .gwt.xml file and inherited that into the NewUiProject .gwt.xml.
>
> > If the OldProject POJOs are left in their project and NewUiProject
> > inherits the .gwt.xml from OldProject a runtime error occurs.
>
> > [ERROR] javax.servlet.ServletContext log: Exception while dispatching
> > incoming RPC call
> > java.lang.NoClassDefFoundError: [Lcom/mycompany/myproject/data/
> > FooDataClass;
> >        at java.lang.Class.getDeclaredMethods0(Native Method)
> >        at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
> >        at java.lang.Class.getMethod0(Unknown Source)
> >        at java.lang.Class.getMethod(Unknown Source)
> >        at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:299)
> >        at
>
> > com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:
> > 206)
> >        at
>
> > com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:
> > 248)
> >        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)
>
> > It looks like FooDataClass is simply not found on the server side and
> > I can't figure out why.  I am using Eclipse and NewUiProject has a
> > project reference to OldProject and also includes OldProject in the
> > Java Build Path Projects.  If there were a project with references
> > across projects I don't think the project would compile.  I also tried
> > packaging a JAR from OldProject and including it in NewUiProject, but
> > that makes no difference.
>
> > I don't think this is a case of not inheriting classes so that GWT
> > knows to compile them in the client side.  That would produce an error
> > when starting up the client and an error message about not being able
> > to find the source code for the data classes. I'm mot seeing that
> > error.  The UI comes up and the error is thrown when interacting with
> > the UI in such a way as to cause an RPC.
>
> > Any ideas?
>
> > Thanks,
> > Mike
>
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