Disabling Scripting
By default, scripting in JSP pages is valid. Because scripting can make pages difficult to maintain, some JSP page authors or page authoring groups may want to follow a methodology in which scripting elements are not allowed.
You can disable scripting for a group of JSP pages by using deploytool and setting the value of the Scripting Invalid checkbox in the JSP Properties tab of a WAR. For information on how to define a group of JSP pages, see Setting Properties for Groups of JSP Pages (page 510). When scripting is invalid, it means that scriptlets, scripting expressions, and declarations will produce a translation error if present in any of the pages in the group. Table 16-1 summarizes the scripting settings and their meanings. ...
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