Actually, its nothing to do with the Java language explicitly. GWT is
cleverly organized to make it quick and comparatively easy to build
sophisticated Ajax apps without having to get too much into the details
of Javascript.
In a GWT project the GWT compiler cross-compiles a subset of the Java
language to Javascript for downloading to the client browser.
You have to tell it which classes to cross-compile and so the GWT
project layout by convention has three separate sub-packages whose names
end with 'client', 'server', 'shared'. You can also add sub-packages to
these.
'client' and 'shared' packages are both compiled by the JRE for use in
hosted mode, AND cross-compiled by GWT for use in production mode.
'client' is for code ONLY used in the client. 'shared' is for code
(typically DTOs, or validation objects) which are used on both client
and server.
You should put classes which are server side only in x.x.x.server or sub
packages. Then you should make sure that the classpath includes any
libraries used by these packages by placing the libraries in the
war/WEB-INF/lib folder and make sure that the JRE looks there.
The exact configuration can be controlled from within a gwt.xml file.
I suggest that you read the
http://code.google.com/webtoolkit/doc/latest/DevGuideOrganizingProjects.html
section.
See also the sections on Modules and Compile and Debug.
Be warned! There's a learning curve in using Java, a STEEP learning
curve in using Java in web projects and another significant
learning curve to using GWT for client/server web applications. I
suggest that you think carefully about the scope and requirements of
your application before
taking these 3 steps. Good luck!
HTH
Alan
m wrote:
Sorry, I'm a c# transplant. I want a create a class that will be used
on server side only. In c# I would just create a new class in the
project... learning that java doesn't work that way. I have created a
class within the main package of my GWT project (not client, not
server, not shared, the main package). But I don't think this works.
It wants to find a .gwt.xml file for this java class. So... what is
the correct way to do this? Thanks.
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