How to redirect to error page in servlet?

Question

I am writing the servlet , in case of exception I am redirecting to my customized error page for that i have done like this.

In web.xml

Answer 1

The problem is that you catch the Exception and therefore no Exception will leave your doPost() method. You will only be redirected error page if an Exception matching the (either identical or a subclass of it) leaves your doPost() method.

You should rethrow the Exception bundled in a RuntimeException for example:

} catch(Exception e) {
    e1.printStackTrace();
    throw new RuntimeException(e);
}

Unfortunately if we're talking about a general Exception you can't just not catch it because doPost() is declared to only throw instances of ServletException or IOException. You are allowed not to catch those, but java.lang.Exception must be caught.