RequestBuilder classes can only be used on the client side. The exception
you are getting is essentially telling you 'You cannot use this class on the
server side'.
To make a GET/POST request from your server code is actually simple and
doesn't have anything to do with GWT. You can use the standard java.net.URL
class.
public void myRPCMethod() {
URL url = new URL("
http://www.services.dynmark.com/HttpServices/SendMessage.ashx?";);
InputStream in = url.openStream();
//Read from the InputStream
// Extract information from XML and return necessary data
}
If you want more options/control, you should use the Apache HttpClient
library http://hc.apache.org/httpclient-3.x/tutorial.html
--Sri
2009/9/13 John V Denley <johnvden...@googlemail.com>
>
> Please excuse the newbie wording below, Im really not sure how to
> phrase this problem correctly, which is of course causing me problems
> with trying to find a solution by searching online, as I dont really
> know what it is that i need to do, but I think its an "HTTP POST" (but
> it could be send/get/submit/request?! as Ive seen all these terms used
> when hunting around for a solution!)
>
> Ive looked around as much as I can though and as is often the case
> cant seem to find any working examples of what I need to do which is
> to call a 3rd party website via an HTTP call from the server side of
> my GWT/GAE application.
>
> Essentially the following code snippet does the job on the client side
> (ive changed the parameters to protect confidentiality):
>
> String SendText="http://www.services.dynmark.com/
> HttpServices/SendMessage.ashx<http://www.services.dynmark.com/%0AHttpServices/SendMessage.ashx>?"
> +
> "user=username" +
> "&password=password" +
> "&to=447765111222"+
> "&from=447765222111" +
> "&text=MESSAGE_TEXT";
> Anchor SendMessageLink = new Anchor("Send Message");
> SendMessageLink.setHref(SendText);
> RootPanel.get().add(SendMessageLink);
>
> when the user clicks on the link though, it takes them to an XML
> result page with a reference number embedded.
>
> Obviously i dont want that to happen, i need to capture the reference
> number so I can then make a different HTTP request to get the status,
> and I dont want the user to see the HTTP text (password) or to be
> redirected to another website.
>
> Ive then tried to use the Requestbuilder function (class/widget?) of
> GWT, but thats when I run into the same origin policy security
> restriction (http://en.wikipedia.org/wiki/Same_origin_policy)
>
> Reading around on the internet, it seems that the only way to achieve
> what I need is to run the HTTP post from the server after an RPC
> conection. I have tried to implement this, but have found no working
> examples to figure out how to achieve this. I have tried to simple
> copy and paste the Requestbuilder code into my server functions, only
> to have the following error appear on the eclipse console:
>
> "Caused by: java.lang.UnsupportedOperationException: ERROR: GWT.create
> () is only usable in client code! It cannot be called, for example,
> from server code."
>
> If anyone can give me some help and advice on this topic, then I would
> be very greatful!
>
> Thanks,
> John
> >
>
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