The El expression on the JSP page is invalid.

El Description: http://docs.oracle.com/javaee/1.4/tutorial/doc/JSPIntro7.html

A short excerpt:

Deactivating expression evaluation

The default value varies depending on the version of the web application deployment descriptor. the default mode for JSP pages delivered using a servlet 2.3 or earlier descriptor is to ignore El expressions; this provides backward compatibility. the default mode for JSP pages delivered with a servlet 2.4 descriptor is to evaluate El expressions; this automatically provides the default that most applications want. you can also deactivate El expression evaluation for a group of JSP pages (see deactivating El expression evaluation).

Generally, servlet2.3 and 2.3 are used to disable El by default, and 2.4 is enabled by default.

Solution:

1. <% @ page iselignored = "True | false" %> false is enabled.

 

2. Web. XML (servlet 2.4 or 2.5 ):

<? XML version ="1.0"Encoding =UTF-8"?>

<Web-app xmlns =Http://java.sun.com/xml/ns/j2ee"Xmlns: xsi =Http://www.w3.org/2001/XMLSchema-instance"Version ="2.4"Xsi: schemalocation =Http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/Web-app_2_4.xsd">

</Web-app>