Identifying the JSP Document to the Container
A JSP document must be identified as such to the Web container so that the container interprets it as an XML document. There are three ways to do this:
In your application's web.xml file, set the is-xml element of the jsp-property-group element to true. Step 17. in The Example JSP Document (page 516) explains how to do this if you are using deploytool to build the application WAR file.
Use a Java Servlet Specification version 2.4 web.xml file and give your JSP document the .jspx extension.
Include a jsp:root element in your JSP document. This method is backward-compatible with JSP 1.2.
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