java - why the "${}" tag in jsp output as a string -

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i want import js file in jsp way

<script type="text/javascript" src="${pagecontext.request.contextpath}/js/layout/jquery-ui.js"></script>

but when browse deployed page ,i found ${pagecontext.request.contextpath}part showed on browsers string,the code above try find js file in ${pagecontext.request.contextpath}/js/layout/ folder instead ofxxx/js/layout/

my developing environment "myeclipse10.5+tomcat7.0+jdk7.0"

check jsp isn't configured ignore el page directive

<%@ page ... iselignored="true" %>

or, check web.xml hasn't turned el off jsps with

<jsp-config>   ...   <el-ignored>true</el-ignored>   ... </jsp-config>


edit :

also, check web.xml's <web-app> version 2.4 or higher. add following web.xml workaround (if nothing else works) :

<jsp-config>   <jsp-property-group>     <url-pattern>*.jsp</url-pattern>     <el-ignored>false</el-ignored>   </jsp-property-group> </jsp-config>

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