What are the effects of disabling scripting in a JSP?

 

I recently read how to disable scripting for an entire application by adding the following elements to the web.xml file: 

<jsp-config>
    <jsp-property-group>
        <url-pattern>*.jsp</url-pattern>
        <scripting-invalid>true</scripting-invalid>
    </jsp-property-group>
</jsp-config>

It went on to state that doing this forces you to always use standard JSP tags, EL, and JSTL instead of scripting, but it doesn't define 'scripting'. I was under the impression that EL is a form of scripting, and now I'm left wondering what is it I can't do exactly, after I disable scripting?

It disables scriptlets ( <% %> ), scriptlet expressions ( <%= %> ) and scriptlet declarations ( <%! %> ), which is a way of embedding raw Java code inside a JSP file. Using scriptlets has indeed been discouraged since the birth of taglibs/EL in favor of better readable and maintainable code.

See also:

  • Java EE 5 tutorial - disabling scripting

    • It disables scriptlets, which is basically java code in the JSP eg

    <% request.getAttribute("bob"); %>

    would not be allowed.

    JSTL, EL, etc. will all work fine.

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