Enhancing Exception Handling

We can also handle exceptions in filters. Here's the doFilter method for an error handler filter:

public void doFilter(
ServletRequest request,
ServletResponse response,
FilterChain chain) throws IOException, ServletException {
try {
chain.doFilter(request, response);
} catch (Exception e) {
PrintWriter out = response.getWriter();
out.println(
"sorry, you must have entered a negative number, try again");
out.println("</body></html>");
out.close();
}
}

Here's a request:

And here's the response: