Is it possible to get calling page name inside a jsp 2.0 custom tag?

<form action="${pageContext.request.requestURI}">

<form action="<%=request.requestURI%>">

<form action="<%=pageContext.request.requestURI%>">

public class YourTag extends TagSupport {
    public int doStartTag() throws JspException {
        HttpServletRequest req = (HttpServletRequest) pageContext.getRequest();
        String pathInfo = req.getPathInfo();

<form action="<%= pageContext.getRequest().getRequestURI() %>">