How do I perform browser redirection from a JSP page?

You can use the response implicit object to redirect the browser to a different resource, as:

response.sendRedirect("http://www.foo.com/path/error.html");

You can also physically alter the Location HTTP header attribute, as shown below:

<%
response.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
String newLocn = "/newpath/index.html";
response.setHeader("Location",newLocn);
%>