<!-- Copyright 2004 The Apache Software Foundation Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.--><html> <head> <title>JSP 2.0 Expression Language - Basic Arithmetic</title> </head> <body> <h1>JSP 2.0 Expression Language - Basic Arithmetic</h1> <hr> 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. <br> <blockquote> <code> <table border="1"> <thead> <td><b>EL Expression</b></td> <td><b>Result</b></td> </thead> <tr> <td>\${1}</td> <td>${1}</td> </tr> <tr> <td>\${1 + 2}</td> <td>${1 + 2}</td> </tr> <tr> <td>\${1.2 + 2.3}</td> <td>${1.2 + 2.3}</td> </tr> <tr> <td>\${1.2E4 + 1.4}</td> <td>${1.2E4 + 1.4}</td> </tr> <tr> <td>\${-4 - 2}</td> <td>${-4 - 2}</td> </tr> <tr> <td>\${21 * 2}</td> <td>${21 * 2}</td> </tr> <tr> <td>\${3/4}</td> <td>${3/4}</td> </tr> <tr> <td>\${3 div 4}</td> <td>${3 div 4}</td> </tr> <tr> <td>\${3/0}</td> <td>${3/0}</td> </tr> <tr> <td>\${10%4}</td> <td>${10%4}</td> </tr> <tr> <td>\${10 mod 4}</td> <td>${10 mod 4}</td> </tr> <tr> <td>\${(1==2) ? 3 : 4}</td> <td>${(1==2) ? 3 : 4}</td> </tr> </table> </code> </blockquote> </body></html>HTTP Status 500 -type Exception reportmessagedescription The server encountered an internal error () that prevented it from fulfilling this request.exceptionorg.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 causeorg.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 causejava.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