ProjectStruture

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​Dear GWT Users,

Many thanks in advance for any help and advice. Very much appreciated!

I have a legacy application: java Swing client with XML based Servlet communication (request and response).

The server comprised of aro

​​

und 10 Servlets, one 'Front Controller' that forwarded (RequestDispatcher

​ ) to other Servlets depending on the initial XML request from client.  These delegated Servlets did everything (parsed XML, db queries, session data, etc).​

I decided move java swing client to gwt. Also move from XML to gwt rpc.  Ideally I dont want to rewrite the whole server again (even thought it just talks in XML / Strings).

I thought I could just forward my request from my main RemoteServiceServlet class, on to my 'legacy' XML servlets.

What do I have so far?

A working GWT client, making RPC calls to my RemoteServiceServlet.

Successfully set session data and forward on to a e.g. LoginServlet.
LoginServlet queries db and updates session data.

Read updated session data in RemoteServiceServlet.

For example:

RemoteServiceServlet
getThreadLocalRequest().getSession().setAttribute("username", username);
requestDispatcher = getThreadLocalRequest().getRequestDispatcher("/LoginServlet");
requestDispatcher.forward(getThreadLocalRequest(), getThreadLocalResponse());

LoginServlet
String username = (String) session.getAttribute("username");
// do some db stuff & set new session data
session.setAttribute("userEmail", userEmail);

RemoteServiceServlet
getThreadLocalRequest().getSession().getAttribute("userEmail")

This seems very convoluted and hacky, and not scalable for the amount of work done in my 'legacy' servlets.  Is there a better way?

Can I have multiple servlets extend RemoteServiceServlet?

Whats the best way to implement a 'front controller' style architecture with gwt?

Whats the best way to integrated multiple legacy XML servlets with a GWT facade / front controller?

My legacy servlets just read and write a lot of XML, for example

<MFRequest>
<Request type='SaveSettings' data=''/>
<UserPrefs download_pref='../' email_pref='yes' decompress_pref='no' password_pref='no'/>
</MFRequest>

This thread was helpful

https://groups.google.com/forum/#!topic/google-web-toolkit/kRmrirPsFC8

 

I have a lot of XML data, session data and file upload / download data (hence have these split up in to different servlets).

Anyway-  hope this gives an overall picture of my project / problem(s).

Regards, Sam

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