How to Properly Handle Exceptions in a JSP/Servlet App?

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The standard thing to do is have your Servlet’s doXxx() method (eg. doGet(), doPost(), etc.) throw a ServletException and allow the container to catch and handle it. You can specify a custom error page to be shown in WEB-INF/web.xml using the <error-page> tag:

<error-page>
    <error-code>500</error-code>
    <location>/error.jsp</location>
</error-page>

If you end up catching an Exception you can’t elegantly handle, just wrap it in a ServletException like this:

try {
    // code that throws an Exception
} catch (Exception e) {
    throw new ServletException(e);
}

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