How To Redirect to jsp from java class in gwt

[piyushgt]

I am new to gwt.I want to send some information to jsp where it is processed in jsp tags.
I saw below code.Call goes to jsp but RPCManager is not resolved at server site.What jars I need to import.And do those jar files need paid license.Please help


Simple arbitrary Remote Procedure Call example (client code):


RPCRequest request = new RPCRequest();
// Note data could be a String, Map or Record
request.setData("Some data to send to the client");
request.setActionURL("/rpcHandler.jsp");

RPCManager.sendRequest(request,
new RPCCallback () {
public void execute(RPCResponse response, Object rawData, RPCRequest request) {
SC.say("Response from the server:" + rawData);
}
}
);

Simple arbitrary Remote Procedure Call example (server code: /rpcHandler.jsp):

RPCManager rpc = new RPCManager(request, response, out);
Object data = rpc.getData();
System.out.println("client sent: " + data.toString());
rpc.send("here's a response");