No exception,no output,that is strange
---------------------------------
package com.tsolution.crm.client;

public class Model
{
       private String desc;
  
    public String getDesc()
    {
        return desc;
    }
    public void setDesc(String desc)
    {
        this.desc = desc;
    }
    
}

-------------------------
.................
public void onModuleLoad()
    {
        Model m1 = new Model();
        m1.setDesc("Hello");
              
        AsyncCallback<String> callback=new AsyncCallback<String>(){
            public void onFailure(Throwable caught)
            {
            }

            public void onSuccess(String result)
            {
                Window.alert(result);
            }
        };
       
        ArrayList<Model> modelList=new ArrayList<Model>();
        modelList.add(m1);
              
        loginService.greetServer(modelList, callback);
}
........................

----------------------------------
package com.tsolution.crm.client;

import java.util.ArrayList;
import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;


@RemoteServiceRelativePath("greet")
public interface GreetingService extends RemoteService {
  String greetServer(ArrayList<Model> modelList);
  String greetServer1(String modelList);
}
-----------------------------------------------
package com.tsolution.crm.client;
import java.util.ArrayList;
import com.google.gwt.user.client.rpc.AsyncCallback;

public interface GreetingServiceAsync {
  void greetServer(ArrayList<Model> modelList, AsyncCallback<String> 
callback);
}
---------------------------------------------
package com.tsolution.crm.server;

import java.util.ArrayList;
import com.tsolution.crm.client.GreetingService;
import com.tsolution.crm.client.Model;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;

public class GreetingServiceImpl extends RemoteServiceServlet implements
        GreetingService
{

    public String greetServer(ArrayList<Model> modelList)
    {
                return modelList.get(0).getDesc();
    }
 
}


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