Skip to Main Content
Java Enterprise Best Practices
book

Java Enterprise Best Practices

by O'Reilly Java Authors
December 2002
Intermediate to advanced content levelIntermediate to advanced
288 pages
9h 46m
English
O'Reilly Media, Inc.
Content preview from Java Enterprise Best Practices

Capture Enough Information to Fine-Tune the Application

With a common error handler for both servlets and JSP pages, it’s easy to log information about runtime errors. By capturing information detailing where the error occurred, the precise problem, and all (or at least most of) the dynamic data available at the time, you can fine-tune the application to deal more gracefully with common, predictable runtime errors.

A global error handler declared with the <error-page> element in the web.xml file has access to all information of interest. First of all, it can get information about which component failed and the exception that was thrown through the following request attributes.

Request attribute name

Java type

Description

javax.servlet.error.status_code
Integer

The HTTP status code that triggered a handler declared as a status code handler

javax.servlet.error.exception
Throwable

The exception that triggered a handler declared as an exception handler

javax.servlet.error.request_uri
String

The URL for the request that triggered the handler

javax.servlet.error.servlet_name
String

The declared name for the servlet or JSP page that triggered the handler, or the class name if no name is declared

In addition to the information available through these request attributes, you should also consider logging request parameter values and application-dependent request, session, and context attributes.

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Moving to Java 9: Better Design and Simpler Code

Moving to Java 9: Better Design and Simpler Code

Trisha Gee
Java EE 8 High Performance

Java EE 8 High Performance

Romain Manni-Bucau

Publisher Resources

ISBN: 0596003846Supplemental ContentErrata Page