Hi friend,

your code having some error please check it. Because you are declared void type function and you are defined inside of
<% out.println(issueData()); %>

so giving error.

public void issueData(HttpServletRequest request, HttpServletResponse response)
throws ServletException,IOException
{
response.setContentType("text/html");
PrintWriter out=response.getWriter();
out.println("This is function issueData .");
}

--------------------------------------------------

Thanks