How to call GWT_SERVLET FROM SERVLET

I want to save data from HttpServlet to DataStore.

--> HttpServlet

 @Override
 public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
 /**
 * response
 */
 res.setContentType("text/html");
 final PrintWriter out = res.getWriter();
 
 /**
 * request
 */
 final String strData = req.getParameter(Constants.REQ_DATA);
 MyData data = new MyData(strData);

 MyServer.getService().createData(data, new AsyncCallback<MyData>() {


 @Override
 public void onFailure(Throwable caught) {
 // TODO Auto-generated method stub
 
 }


 @Override
 public void onSuccess(MyData result) {
 // TODO Auto-generated method stub
    out.println("success!");
    out.close();
 }
 });
}

But I get error in this line  MyServer.getService().createData(data, new AsyncCallback<MyData>() {

--> Error

java.lang.NoClassDefFoundError: com/google/gwt/core/client/GWTBridge

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:191)

at com.google.appengine.tools.development.agent.runtime.RuntimeHelper.checkRestricted(RuntimeHelper.java:70)

at com.google.appengine.tools.development.agent.runtime.Runtime.checkRestricted(Runtime.java:65)

at com.myserver.client.MyServer.<clinit>(MyServer.java:17)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:191)

at com.google.appengine.tools.development.agent.runtime.RuntimeHelper.checkRestricted(RuntimeHelper.java:70)

at com.google.appengine.tools.development.agent.runtime.Runtime.checkRestricted(Runtime.java:65)

Can you please guide me how to fix it.

Thanks in advance !

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