{var%20f='http://v.t.sina.com.cn/share/share.php?appkey=1515056452',u=z||d.location,p=['&url=',e(u),'&title=',e(t||d.title),'&source=',e(r),'&sourceUrl=',e(l),'&content=',c||'gb2312','&pic=',e(p||'')].join('');function%20a(){if(!window.open([f,p].join(''),'mb',['toolbar=0,status=0,resizable=1,width=440,height=430,left=',(s.width-440)/2,',top=',(s.height-430)/2].join('')))u.href=[f,p].join('');};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else%20a();})(screen,document,encodeURIComponent,'','','https://www.manongdao.com/data/attach/logo/logo.png', '推荐 淡お忘 的问题《Expression Language in JSP not working [duplicate]》','https://www.manongdao.com/q-22542.html','页面编码gb2312|utf-8默认gb2312'));){kind=link}
This question already has an answer here:
- EL expressions not evaluated in JSP 2 answers
I am new to JSP and using Expression language. I am using Eclipse Galileo with version 2.5 and Tomcat 6 server . I just want to ask that my simple Expression Language is not printing the vale like if i write ${1>2} which suppose to give false but it is displaying ${1>2} only when it renders the page. But when i am using <c:out value="${1>2}"/> it is printing false correctly. I think there is an issue with tag library. Please kindly suggest me the reason for this i am giving a sample code for this so that you can understand where I am going wrong:-
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Expression Language Example</title>
</head>
<body>
Is 1 greater than 2 using cout :<c:out value="${1>2}"/>
Is 1 greater than 2 without using cout: ${1>2}
</body>
</html>
Update as per the answers, here is more information:
I am showing my web.xml how it looks like:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:jsp="http://java.sun.com/xml/ns/javaee/jsp" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>ScriptLessJsp</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<description></description>
<display-name>ElServlet</display-name>
<servlet-name>ElServlet</servlet-name>
<servlet-class>com.servlet.El.ElServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ElServlet</servlet-name>
<url-pattern>/ElServlet</url-pattern>
</servlet-mapping>
<servlet>
<description></description>
<display-name>Collections</display-name>
<servlet-name>Collections</servlet-name>
<servlet-class>com.servlet.El.Collections</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Collections</servlet-name>
<url-pattern>/go</url-pattern>
</servlet-mapping>
</web-app>
And in my lib folder I have added only jstl.jar so that i can make use of <c:out> tag to display but my EL for template text is not working.
I'm quoting from an answer I provided before to the problem of EL not working:
In your particular case, EL works in taglibs, but not in template text, so I suspect it's caused by point 2. Ensure that your
web.xmlis declared as at least Servlet 2.4. As Tomcat 6.0 supports Servlet 2.5, I would recommend to declare yourweb.xmlas Servlet 2.5:Another rare cause I've seen on this is that there's a collision with EL JAR's in the classpath. Ensure that you have not copied any appserver-specific JAR files into your webapp's
WEB-INF/libor, more worse, theJRE/lib.As you're already using Eclipse and Tomcat, I would review the development steps you used for this all. Ensure that you're using "Eclipse for Java EE developers" and that you've integrated the Tomcat instance in Eclipse's Servers view and that you've created a Dynamic Web Project set to "Servlet 2.5" which makes use of the Tomcat instance. This way everything should go automagically (Eclipse will take appserver's libraries in the build path itself and autogenerate a Servlet 2.5 compliant
web.xml).Update: as per your update: those
com.servlet.Elservlets look suspicious. What exactly do they do? Parsing EL? Remove them and retry.In my case, I generated a webapp by maven archetype generator, I use maven-archetype-webapp. I need to change two things:
in web.xml, change the head to:
by default, eclipse generated jsp file with head:
Just remove it.
setting <%@ page isELIgnored="false" %> helped to me. Don't know why it was the root of the problem in my case. not clear why yet
I've had the problem that with the line
<!DOCTYPE html>in my JSP, the tomcat started with eclipse didn't interpret the EL correctly. Using the war and copying it to thewebappsfolder and then starting tomcat with the commandline did the job.So obviously eclipse tomcat plugin has a problem with
<!DOCTYPE html>?!BalusC covers it, but I'll add these comments:
The JSTL TLD namespace should include a "jsp" (as above). Given this namespace error may be due to following old instructions, check the most recent documentation to ensure you haven't included any obsolete libraries in
WEB-INF/lib. A number of technologies that used to be separate are now included in the container (the EL language being one).As an aside, I would generally use keywords like
gtinstead of>andltinstead of<- this is friendlier to XML and its ilk.