Comments on: Guice with GWT

By: Axel Rauschmayer

Axel Rauschmayer — Sat, 27 Feb 2010 14:52:46 +0000

Thanks for this blog post! I’ve just tried this approach with GWT 2.0 and it works perfectly. But I did need aopalliance.jar in addition to the two JARs you mentioned.

Question:
- Is it possible to avoid “/MyApp/” in serve(”/MyApp/GWT.rpc”)? Given that this is just the name of the web application, it would be nice if one could avoid this redundancy somehow.

By: Peter Putzig

Peter Putzig — Sat, 09 Jan 2010 06:58:30 +0000

Solution is simple. I forgot to adapt the the path in serve()

serve( “/myweb/GWT.rpc” ).with( GuiceRemoteServiceServlet.class );

By: Toine

Toine — Thu, 17 Dec 2009 02:14:01 +0000

Hello again

I tried to use it but i get the error
Error 404: SRVE0190E: File not found: /bw_gxt_01/GWT.rpc

protected void configureServlets() {
serve(”/bw_gxt_01/GWT.rpc”).with(GuiceRemoteServiceImpl.class);
System.out.println(”BwServletModel.configureServlets()”);
bind(ListService.class).to(ListServiceImpl.class);
}
@RemoteServiceRelativePath(”GWT.rpc”)
public interface ListService extends RemoteService {

Am i forgetting something
regards toine

By: Toine

Toine — Thu, 17 Dec 2009 01:42:47 +0000

Hello

thx for the Info
Did you also tried to implement JPA and EJB3 with it

regards toine

By: Ming Zhu

Ming Zhu — Thu, 03 Dec 2009 13:26:56 +0000

Here is my modified code. I have to a cast to request. Does this look right? Thanks! -Ming

private Provider request;
private HttpServlet servlet;

@Inject
public GreetingServiceImpl(Provider request, HttpServlet servlet) {
this.request = request;
this.servlet = servlet;
}
public String greetServer(String input) {
String serverInfo = servlet.getServletContext().getServerInfo();
String userAgent = ((HttpServletRequest) request).getHeader(”User-Agent”);
return “Hello, ” + input + “!I am running ” + serverInfo
+ “.It looks like you are using:” + userAgent;
}

By: Eric Burke

Eric Burke — Wed, 02 Dec 2009 21:26:41 +0000

You probably need to inject Provider for this reason from that same page I linked to: “Note that if you want access to any of the request or session scoped classes from singletons or other wider-scoped instances, you should inject a Provider instead.”

By: Ming Zhu

Ming Zhu — Wed, 02 Dec 2009 21:22:42 +0000

Is this what I should do?
Old code:

@SuppressWarnings(”serial”)
public class GreetingServiceImpl extends RemoteServiceServlet implements
GreetingService {
public String greetServer(String input) {
String serverInfo = getServletContext().getServerInfo();
String userAgent = getThreadLocalRequest().getHeader(”User-Agent”);
return “Hello, ” + input + “!I am running ” + serverInfo
+ “.It looks like you are using:” + userAgent;
}
}

New code:

@SuppressWarnings(”serial”)
public class GreetingServiceImpl implements GreetingService {

HttpServletRequest request;
HttpServlet servlet;

@Inject
public GreetingServiceImpl(HttpServletRequest request, HttpServlet servlet) {
this.request = request;
this.servlet = servlet;
}

public String greetServer(String input) {
String serverInfo = servlet.getServletContext().getServerInfo();
String userAgent = request.getHeader(”User-Agent”);
return “Hello, ” + input + “!I am running ” + serverInfo
+ “.It looks like you are using:” + userAgent;
}

}

By: Eric Burke

Eric Burke — Wed, 02 Dec 2009 20:25:28 +0000

If you need to use HttpServletRequest, HttpSession, etc, you simply @Inject those objects wherever you need them. This is mentioned here: http://code.google.com/p/google-guice/wiki/ServletModule

By: Ming Zhu

Ming Zhu — Wed, 02 Dec 2009 20:21:47 +0000

Without using the extends RemoteServiceServlet, how can I use method like getServletContext().getServerInfo() and getThreadLocalRequest().getHeader(”User-Agent”)? Thanks! -Ming

By: Eric Burke

Eric Burke — Sun, 29 Nov 2009 13:18:09 +0000

@Craig Thanks! I fixed that just now.