Hi all, i am new to the gwt http servlet mechanism and really really
need some help. i know that GWT cannot support some of the java
classes, so had to use their request builder instead. i got a class
not found exception, but is not sure whats wrong! help is really
appreciated!
yup and does anyone know of a full step by step tutorial with the
server side codes as well?
would be great if there was one to follow thru.
--------------client side---------
public class Testing4 implements EntryPoint {
public void onModuleLoad() {
// TODO Auto-generated method stub
String url = "login?login=3&password=3";
RequestBuilder builder = new RequestBuilder
(RequestBuilder.GET,
URL.encode(url));
try {
//RequestBuilder builder = new RequestBuilder
(RequestBuilder.GET,
"login");
builder.sendRequest("", new RequestCallback()
{
public void onResponseReceived(Request
request, Response response)
{
if (200 ==
response.getStatusCode()) {
// Process the response in
response.getText()
Window.alert("the
string: "+ response.getText());
} else {
// Handle the error. Can get
the status text from
response.getStatusText()
Window.alert(" Connected
with error(maybe)");
}
}
public void onError(Request request,
Throwable exception) {
Window.alert("Error ("+
exception +")"); } });
} catch(RequestException exception) {
Window.alert("Wooops ("+ exception
+")"); }
}
}
--------------server side------------------------
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#doGet(HttpServletRequest request,
HttpServletResponse response)
*/
protected void doGet(HttpServletRequest req,
HttpServletResponse
resp) throws ServletException, IOException {
String login = (String) req.getParameter("login");
String password = (String) req.getParameter
("password");
System.out.println("Login: "+ login +"/"+ password);
GWT.log("Login: "+ login +"/"+ password, null);
Document doc = XMLParser.createDocument();
Element root;
if(login != null && !login.equals("") && login.equals
(password)) {
root = doc.createElement("loginSuccessful");
root.setAttribute("login", login.toUpperCase
()); }
else {
root = doc.createElement("loginFailed");
Element causes = doc.createElement("causes");
Element cause;
if(login == null || login.equals("")) {
cause = doc.createElement
("loginIsEmpty"); }
else { cause = doc.createElement
("loginAndPasswordDontMatch"); }
causes.appendChild(cause);
root.appendChild(causes);
}
doc.appendChild(root);
resp.setContentType("text/xml");
System.out.println(doc.toString());
resp.getOutputStream().print(doc.toString());
}
/**
* @see HttpServlet#doPost(HttpServletRequest request,
HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request,
HttpServletResponse
response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
--------------------xml file----------------------------------
<module>
<!-- Inherit the core Web Toolkit stuff. -->
<inherits name='com.google.gwt.user.User'/>
<inherits name="com.google.gwt.xml.XML"/>
<inherits name="com.google.gwt.http.HTTP"/>
<!-- Specify the app entry point class. -->
<entry-point class='com.mycomapny.mypackage.client.Testing4'/>
<inherits name="com.google.gwt.user.theme.standard.Standard"/>
<!-- <inherits name="com.google.gwt.user.theme.chrome.Chrome"/
> -->
<!-- <inherits name="com.google.gwt.user.theme.dark.Dark"/> --
>
<servlet path="/login"
class="com.mycompany.mypackage.server.LoginServlet"/>
</module>
-----------------------exception ------------------------------
[ERROR] Unable to instantiate
'com.mycompany.mypackage.server.LoginServlet'
java.lang.ClassNotFoundException:
com.mycompany.mypackage.server.LoginServlet
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at
com.google.gwt.dev.shell.GWTShellServlet.tryGetOrLoadServlet
(GWTShellServlet.java:936)
at com.google.gwt.dev.shell.GWTShellServlet.service
(GWTShellServlet.java:277)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:
802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke
(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext
(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke
(StandardPipeline.java:520)
at
org.apache.catalina.core.StandardContextValve.invokeInternal
(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke
(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext
(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke
(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke
(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext
(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke
(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext
(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke
(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke
(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext
(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke
(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke
(ContainerBase.java:
929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service
(CoyoteAdapter.java:
160)
at org.apache.coyote.http11.Http11Processor.process
(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol
$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt
(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool
$ControlRunnable.run
(ThreadPool.java:683)
at java.lang.Thread.run(Unknown Source)
[ERROR] Unable to dispatch request
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