How to Configure a Default Error Page in web.xml?

Default Error Page Configuration in Web.xml

In an effort to provide a user-friendly experience, you can utilize the element in web.xml to specify error pages for specific HTTP error codes. However, if you wish to define a default error page that handles all unspecified errors, this article provides guidance on how to achieve that in web.xml.

For Servlet 3.0 and above, simply include the following code in your web.xml:

<code class="xml"><web-app ...>
    <error-page>
        <location>/general-error.html</location>
    </error-page>
</web-app></code>

However, if you are using Servlet 2.5 or below, you must specify each potential error code individually. Common error codes to consider include:

• 401 (Missing login)
• 403 (Forbidden directory listing)
• 404 (Missing resource)
• 500 (Uncaught exception)
• 503 (Unsupported servlet method)

Here's an example of the necessary web.xml configuration:

<code class="xml"><error-page>
    <!-- Missing login -->
    <error-code>401</error-code>
    <location>/general-error.html</location>
</error-page>
<error-page>
    <!-- Forbidden directory listing -->
    <error-code>403</error-code>
    <location>/general-error.html</location>
</error-page>
<error-page>
    <!-- Missing resource -->
    <error-code>404</error-code>
    <location>/Error404.html</location>
</error-page>
<error-page>
    <!-- Uncaught exception -->
    <error-code>500</error-code>
    <location>/general-error.html</location>
</error-page>
<error-page>
    <!-- Unsupported servlet method -->
    <error-code>503</error-code>
    <location>/general-error.html</location>
</error-page></code>

By implementing these configurations, you can ensure that all unspecified errors are directed to a user-friendly default error page, enhancing the user experience and providing a consistent error handling mechanism for your web application.

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