Struts2 debug=browser does not capture url parameters in action class variables?

I have a very simple action class with one member variable "data". when I submit the normal url it shows value in tomcat console like:Test action data=hello

public class ActionTest extends ActionSupport {

private static final long serialVersionUID = -2606731098320589210L;
private String data;

public String getData() {
    return data;
}

public void setData(String data) {
    this.data = data;
}

@Action(value = "mytestaction")
public String execute() {
    System.out.println("Test action data="+data);
    return SUCCESS;
}
}

If I use debug mode like modifying url with mytestaction.action?data=hello&debug=browser in tomcat console it shows Test action data=null. But it shows the value in browser ognl context tree in parameters. However the same data is null when Action class is expanded.

In other debug mode like debug=xml it comes as

<actionErrors /> 
<actionMessages /> 
<class>class com.ycs.fe.actions.ActionTest</class> 
<data>hello</data> 
<errorMessages /> 
<errors /> 
<fieldErrors /> 

and in debug=console mode if i print the OGNL #action.data =>shows hello also #parameters.data[0] => shows hello.

Is this a genuine bug? or am i missing something? I tried with convention as well as mapping in struts.xml, but both have开发者_如何学编程 same result.