JSP 2.0 Expression Language - Basic Arithmetic

This example illustrates basic Expression Language arithmetic. Addition (+), subtraction (-), multiplication (*), division (/ or div), and modulus (% or mod) are all supported. Error conditions, like division by zero, are handled gracefully.
EL Expression Result
\${1} ${1}
\${1 + 2} ${1 + 2}
\${1.2 + 2.3} ${1.2 + 2.3}
\${1.2E4 + 1.4} ${1.2E4 + 1.4}
\${-4 - 2} ${-4 - 2}
\${21 * 2} ${21 * 2}
\${3/4} ${3/4}
\${3 div 4} ${3 div 4}
\${3/0} ${3/0}
\${10%4} ${10%4}
\${10 mod 4} ${10 mod 4}
\${(1==2) ? 3 : 4} ${(1==2) ? 3 : 4}
HTTP Status 500 - type Exception report message description The server encountered an internal error () that prevented it from fulfilling this request. exception org.apache.jasper.JasperException: org.apache.jasper.tagplugins.jstl.If org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) javax.servlet.http.HttpServlet.service(HttpServlet.java:802) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:585) org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243) java.security.AccessController.doPrivileged(Native Method) javax.security.auth.Subject.doAsPrivileged(Subject.java:517) org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:275) org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161) root cause org.apache.jasper.JasperException: org.apache.jasper.tagplugins.jstl.If org.apache.jasper.compiler.TagPluginManager.init(TagPluginManager.java:109) org.apache.jasper.compiler.TagPluginManager.apply(TagPluginManager.java:51) org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:189) org.apache.jasper.compiler.Compiler.compile(Compiler.java:295) org.apache.jasper.compiler.Compiler.compile(Compiler.java:276) org.apache.jasper.compiler.Compiler.compile(Compiler.java:264) org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:303) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) javax.servlet.http.HttpServlet.service(HttpServlet.java:802) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:585) org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243) java.security.AccessController.doPrivileged(Native Method) javax.security.auth.Subject.doAsPrivileged(Subject.java:517) org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:275) org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161) root cause java.lang.ClassNotFoundException: org.apache.jasper.tagplugins.jstl.If java.net.URLClassLoader$1.run(URLClassLoader.java:200) java.security.AccessController.doPrivileged(Native Method) java.net.URLClassLoader.findClass(URLClassLoader.java:188) java.lang.ClassLoader.loadClass(ClassLoader.java:306) java.lang.ClassLoader.loadClass(ClassLoader.java:251) java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) java.lang.Class.forName0(Native Method) java.lang.Class.forName(Class.java:164) org.apache.jasper.compiler.TagPluginManager.init(TagPluginManager.java:106) org.apache.jasper.compiler.TagPluginManager.apply(TagPluginManager.java:51) org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:189) org.apache.jasper.compiler.Compiler.compile(Compiler.java:295) org.apache.jasper.compiler.Compiler.compile(Compiler.java:276) org.apache.jasper.compiler.Compiler.compile(Compiler.java:264) org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:303) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) javax.servlet.http.HttpServlet.service(HttpServlet.java:802) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:585) org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243) java.security.AccessController.doPrivileged(Native Method) javax.security.auth.Subject.doAsPrivileged(Subject.java:517) org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:275) org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161) note The full stack trace of the root cause is available in the Apache Tomcat/5.5 logs. Apache Tomcat/5.5