java - How to make EL relational operators to work on Tomcat 8/JSTL 1.2 -
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i'm having strange behavior since our upgrade tomcat 6 tomcat 8.0.32.
relational operators (<, >, <=, >=) not working variables defined c:set
public class serviceconstants { public static final integer my_const = 15; } below code (updated):
<%@ page iselignored="false"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <c:set var="a" value="<%=serviceconstants.my_const%>"/> <c:set var="b" value="${127}" /> <html> <body> <br/>a: ${a} <br/>b: ${b} <br/>using variables {b > a}: ${b > a} <br/>using variables {b gt a}: ${b gt a} <br/>hardcoded values {127 > 15}: ${127 > 15} </body> </html> and below rendered
a: 15 b: 127 using variables {b > a}: false using variables {b gt a}: false hardcoded values {127 > 15}: true when comparing , b set c:set returning wrong answer.
below web.xml file
<?xml version="1.0" encoding="utf-8"?> <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0" metadata-complete="true"> <absolute-ordering /> <distributable/> <display-name>app name</display-name> <jsp-config> <taglib> <taglib-uri>http://xyzo.org/app</taglib-uri> <taglib-location>/web-inf/tld/app.tld</taglib-location> </taglib> </jsp-config> </web-app> i tried several solutions posted, changing tomcat 8.0.37 (latest), change web.xml file header , such.
any appreciated.
edit below:
i've found out numbers being interpreted strings el. if force cohersion works seems cumbersome.
<%@ page iselignored="false"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <c:set var="a" value="<%=serviceconstants.my_const%>"/> <c:set var="b" value="${127}" /> <html> <body> <br/>a: ${a} <br/>b: ${b} <br/>using variables {b > a}: ${b > a} <br/>using variables {b gt a}: ${b gt a} <br/>hardcoded values {127 > 15}: ${127 > 15} <br/>... <br/>forcing cohersion <br/>using variables {b > (0 + a)}: ${b > (0 + a)} </body> </html> it results:
a: 15 b: 127 using variables {b > a}: false using variables {b gt a}: false hardcoded values {127 > 15}: true ... forcing cohersion using variables {b > (0 + a)}: true any tips on how make el 'right thing' still appreciated.
if use expressions when setting variables it's less cumbersome:
<c:set var="a" value="${15}"/> <c:set var="b" value="${127}" />
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