RPCRequest as JSON data

[edulid]

Hi,
I need to call a Restful web service from within smartgwt which expects/returns JSON.
So I need for example to send this request:

Request:

{"id":"ID","method":"authenticate","params":{"user":"ANDROID", "password":"PASSWORD", "client":"CLIENT"},"jsonrpc":"2.0"}

I tried the following:

public void onModuleLoad() {

final VLayout vlayout = new VLayout();
IButton but = new IButton("click me");
but.addClickHandler(new ClickHandler() {

@Override
public void onClick(ClickEvent event) {
RPCRequest request = new RPCRequest();
request.setActionURL("http://myWebServiceURL");

request.setContentType("application/json");
request.setUseSimpleHttp(true);
request.setHttpMethod("POST");

Map<String, String> params = new HashMap<String, String>();
params.put("id", "ID");
params.put("method", "authenticate");

params.put("params", "\"user\":\"ANDROID\",\"password\":\"PASSWORD\", \"client\":\"CLIENT\"");

params.put("jsonrpc", "2.0");
request.setParams(params);

RPCManager.sendRequest(request, new RPCCallback() {

@Override
public void execute(RPCResponse response, Object rawData,RPCRequest request) {

String data = String.valueOf(rawData);
System.out.println(data);
}

});

}

});

vlayout.addMember(but);
vlayout.setWidth100();
vlayout.setHeight100();
vlayout.draw();

}

But I get the following:
Transport error - HTTP code: 0 for URL: http://myWebServiceURL

In eclipse I see:

16:45:16.746 [ERROR] [builtinds] 16:45:16.743:XRP9:WARN:RPCManager:xmlHttpRequest.getAllResponseHeaders() returned null

com.smartgwt.client.core.JsObject$SGWT_WARN: 16:45:16.743:XRP9:WARN:RPCManager:xmlHttpRequest.getAllResponseHeaders() returned null
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:105)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:72)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:296)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:551)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:368)
    at java.lang.Thread.run(Thread.java:745)

and

16:45:16.993 [ERROR] [builtinds] 16:45:16.990:XRP9:WARN:RPCManager:Transport error - HTTP code: 0 for URL: http://myWebServiceURL - response: {operationId: "custom", clientContext: undef, internalClientContext: undef, context: Obj, transactionNum: 0, httpResponseCode: 0, httpResponseText: "", xmlHttpRequest: [object XMLHttpRequest], transport: "xmlHttpRequest", status: -90, clientOnly: undef, httpHeaders: null, isStructured: true, callbackArgs: null, results: Obj, data: "Transport error - HTTP code: 0 for URL: ..."[108]}

com.smartgwt.client.core.JsObject$SGWT_WARN: 16:45:16.990:XRP9:WARN:RPCManager:Transport error - HTTP code: 0 for URL: http://myWebServiceURL - response: {operationId: "custom", clientContext: undef, internalClientContext: undef, context: Obj, transactionNum: 0, httpResponseCode: 0, httpResponseText: "", xmlHttpRequest: [object XMLHttpRequest], transport: "xmlHttpRequest", status: -90, clientOnly: undef, httpHeaders: null, isStructured: true, callbackArgs: null, results: Obj, data: "Transport error - HTTP code: 0 for URL: ..."[108]}
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:105)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:72)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:296)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:551)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:368)
    at java.lang.Thread.run(Thread.java:745)

Any ideas?
I think maybe the RPCRequest is not being sent as RPC-JSON type, but how to change this?

Using smartgwt 6.1p power

[Isomorphic]

HTTP code 0 is how some browsers signal that you've attempted an invalid request that never left the browser.

In this case you've set a POST with a content type, but you haven't provided any data - you need to call setData() with the data you want to POST.

You *did* provide params, but those would only be serialized into the request body if you had left the contentType at its default setting of "application/x-www-form-urlencoded", which is basically how an HTML form encodes a post, and is not what you want.

[edulid]

Hi Isomorphic
thanks for pointing in the right direction. I was able to solve the issue by setting the JSON Data:
request.setData("{...}");

Now I need to move this functionality to the server. I see the class : com.isomorphic.rpc.RPCRequest
but I cannot set the actionUrl or HTTPMethod. How to use this class? Am I doing something wrong?

[edulid]

or should I use standard java methods for this? HttpUrlConnection , etc ?

[edulid]

--> I solved it using standard HTTPRequest HTTPResponse objects. Thanks!