Spring and GWT integration

Googling for ways to integrate GWT with Spring, I didn’t find any simple solution.

Here is what I need :

  • GWT RPC services should be Spring beans.
  • They should be POJOs NOT extending RemoteServiceServlet.
  • Mapping between Servlet paths and beans should be straightforward.

Here is what I came up with :

  • It’s a very simple Servlet that receives every RPC request.
  • It then gets a Spring bean by the name of the Servlet path used for the call.
  • The method call to the bean is done with reflection.

public class SpringDispatchService extends RemoteServiceServlet {
    private final ClassPathXmlApplicationContext context;

    public SpringDispatchServiceImpl() {
        context=new ClassPathXmlApplicationContext(“beans.xml”);
    }

    public String processCall(String payload)
        throws SerializationException {
        try {
            Object target=context.getBean(getServletName());

            RPCRequest rpcRequest=RPC.decodeRequest(
                payload,target.getClass());
            
            Method method=rpcRequest.getMethod();
            Object[] params=rpcRequest.getParameters();

            Object result=method.invoke(target,params);
            
            return RPC.encodeResponseForSuccess(method,result);
        } catch(Throwable ex) {
            return RPC.encodeResponseForFailure(null,ex);
        }
    }
}

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