Getting Java object as JSON response using JQuery AJAX

I am new to JQuery, Struts2 and Ajax.

I am trying to get Java object in JQuery Ajax through Struts2 Action class. I get the response as [object Object]

$.ajax({
/* type : "POST", */
url : "launchapptest",
/* contentType: "application/json; charset=utf-8", */
data : "processDateInput="+processDate,
dataType : "json",
async: true,
success : function(result) {
	alert(result);
	alert("Success");					
	}
});
      

        
        
        
      

    

My action class:

 public class LaunchAppTestAction extends ActionSupport {

private static final long serialVersionUID = -367986889632883043L;

//private ProcessDate pd = new ProcessDate();

 private Object od;

private String processDateInput=null;   


public String execute() throws Exception {

    OverviewService os = new OverviewService();
    System.out.println("Action Class" +processDateInput);

    List<?> overviewList = os.getOverViewDetails(processDateInput); 

    setOd(overviewList);

    return SUCCESS;
}

public String getProcessDateInput() {
    return processDateInput;
}

public void setProcessDateInput(String processDateInput) {
    this.processDateInput = processDateInput;
}

 public Object getOd() {
        return od;
    }

    public void setOd(Object od) {
        this.od = od;
    }}

      

        
        
        
      

    

My struts.xml looks like:

    <action name="launchapptest" class="com.ge.wd.action.LaunchAppTestAction">
        <result name= "success" type="json">
        </result>
    </action>

      

        
        
        
      

    

Please let me know how I can access the Od object in JQuery Ajax.