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POSpring 3, Ajax & JQuery: Why Aren't My Requests Reaching My Controller?
 

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  1. POSpring 3, Ajax & JQuery: Why Aren't My Requests Reaching My Controller?
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    <hr> <p><strong>Answer:</strong></p> <hr> <p>My Spring 3 Java webapp is "acme". I had this for my JQuery call to contact the Spring 3 Java server side components:</p> <pre><code>$.post("/test_ajax", {state:"Alaska"}); </code></pre> <p>I needed to put the "context-root" ( aka the webapp name ) in the URL:</p> <pre><code>$.post("/acme/test_ajax", {state:"Alaska"}); </code></pre> <hr> <p>I'm learning Spring 3, Ajax and JQuery. I made myself a small webapp, "<strong>acme</strong>", to learn how to connect the 3 technologies. From my logging statements it looks the handler method <strong>getAddressList()</strong> in the Controller <strong>HelloController</strong> is not getting called after the JQuery POST request.</p> <p>I started off making my JQuery call as:</p> <pre><code>$.post("/test_ajax", {state:"Alaska"}); </code></pre> <p>My code is quoted below</p> <p>Any clues would be much appreciated. Thanks in advance Steve</p> <p><strong>hello.jsp</strong></p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;title&gt;ACME JSP&lt;/title&gt; &lt;script language = "JavaScript" src = "../acme/js/jquery-1.7.js"&gt;&lt;/script&gt; &lt;script language = "JavaScript"&gt; function test(){ $("#div1").replaceWith("Text Replaced With Javascript"); $.post("/test_ajax", {state:"Alaska"}); } &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;h1&gt;Hello.jsp: ${message}&lt;/h1&gt; &lt;div id = "div1"&gt; Original Text &lt;/div&gt; &lt;input type="submit" value="Test" onclick="test()" /&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p><strong>HelloController.java:</strong></p> <pre><code>package com.acme.controller; import javax.annotation.Resource; import javax.servlet.http.*; import org.springframework.stereotype.Controller; import org.springframework.validation.*; import org.springframework.ui.ModelMap; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.SessionAttributes; import org.apache.log4j.Logger; @Controller public class HelloController { private static final Logger logger = Logger.getLogger(HelloController.class); @RequestMapping({"/","/hello"}) public String home(ModelMap model) { logger.debug("Started..."); model.put("message","Hello From The Spring 3.1 Controller!"); return "hello"; } @RequestMapping(value = "/test_ajax", method = RequestMethod.POST) public @ResponseBody String getAddressList( @RequestParam(required=true) String state, ModelMap model ) { logger.debug("started..."); logger.debug("State: " + state); String a_string = "Test String From Spring And Ajax!"; return a_string; } }// end class HelloController </code></pre> <p><strong>acme-servlet.xml:</strong></p> <pre><code>&lt;beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"&gt; &lt;context:component-scan base-package="com.acme.controller" /&gt; &lt;mvc:resources mapping = "/**" location = "/"/&gt; &lt;mvc:annotation-driven/&gt; &lt;bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"&gt; &lt;property name = "prefix" value = "/jsp/"/&gt; &lt;property name = "suffix" value = ".jsp"/&gt; &lt;/bean&gt; &lt;/beans&gt; </code></pre> <p><strong>web.xml:</strong></p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;web-app id="WebApp_ID" version="3.0" 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"&gt; &lt;display-name&gt;ACME Web Application&lt;/display-name&gt; &lt;servlet&gt; &lt;servlet-name&gt;acme&lt;/servlet-name&gt; &lt;servlet-class&gt;org.springframework.web.servlet.DispatcherServlet&lt;/servlet-class&gt; &lt;load-on-startup&gt;1&lt;/load-on-startup&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;acme&lt;/servlet-name&gt; &lt;url-pattern&gt;/&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;!-- Help Find The Spring Config Files --&gt; &lt;listener&gt; &lt;listener-class&gt; org.springframework.web.context.ContextLoaderListener &lt;/listener-class&gt; &lt;/listener&gt; &lt;context-param&gt; &lt;param-name&gt;contextConfigLocation&lt;/param-name&gt; &lt;param-value&gt;/WEB-INF/acme-servlet.xml&lt;/param-value&gt; &lt;/context-param&gt; &lt;/web-app&gt; </code></pre> <p><strong>pom.xml:</strong></p> <pre><code>&lt;project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"&gt; &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt; &lt;groupId&gt;com.acme&lt;/groupId&gt; &lt;artifactId&gt;acme&lt;/artifactId&gt; &lt;packaging&gt;war&lt;/packaging&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;name&gt;ACME webapp&lt;/name&gt; &lt;url&gt;http://maven.apache.org&lt;/url&gt; &lt;dependencies&gt; &lt;dependency&gt; &lt;groupId&gt;log4j&lt;/groupId&gt; &lt;artifactId&gt;log4j&lt;/artifactId&gt; &lt;version&gt;1.2.16&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;javax.servlet.jsp.jstl&lt;/groupId&gt; &lt;artifactId&gt;jstl-api&lt;/artifactId&gt; &lt;version&gt;1.2-rev-1&lt;/version&gt; &lt;exclusions&gt; &lt;exclusion&gt; &lt;groupId&gt;javax.servlet.jsp&lt;/groupId&gt; &lt;artifactId&gt;jsp-api&lt;/artifactId&gt; &lt;/exclusion&gt; &lt;exclusion&gt; &lt;groupId&gt;javax.servlet&lt;/groupId&gt; &lt;artifactId&gt;servlet-api&lt;/artifactId&gt; &lt;/exclusion&gt; &lt;/exclusions&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.glassfish.web&lt;/groupId&gt; &lt;artifactId&gt;jstl-impl&lt;/artifactId&gt; &lt;version&gt;1.2&lt;/version&gt; &lt;exclusions&gt; &lt;exclusion&gt; &lt;groupId&gt;javax.servlet.jsp&lt;/groupId&gt; &lt;artifactId&gt;jsp-api&lt;/artifactId&gt; &lt;/exclusion&gt; &lt;exclusion&gt; &lt;groupId&gt;javax.servlet&lt;/groupId&gt; &lt;artifactId&gt;servlet-api&lt;/artifactId&gt; &lt;/exclusion&gt; &lt;/exclusions&gt; &lt;/dependency&gt; &lt;!-- Spring 3.1.1 --&gt; &lt;dependency&gt; &lt;groupId&gt;org.springframework&lt;/groupId&gt; &lt;artifactId&gt;spring-core&lt;/artifactId&gt; &lt;version&gt;3.1.1.RELEASE&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.springframework&lt;/groupId&gt; &lt;artifactId&gt;spring-web&lt;/artifactId&gt; &lt;version&gt;3.1.1.RELEASE&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.springframework&lt;/groupId&gt; &lt;artifactId&gt;spring-webmvc&lt;/artifactId&gt; &lt;version&gt;3.1.1.RELEASE&lt;/version&gt; &lt;/dependency&gt; &lt;!-- Spring Security --&gt; &lt;dependency&gt; &lt;groupId&gt;org.springframework.security&lt;/groupId&gt; &lt;artifactId&gt;spring-security-core&lt;/artifactId&gt; &lt;version&gt;3.1.0.RELEASE&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.springframework.security&lt;/groupId&gt; &lt;artifactId&gt;spring-security-config&lt;/artifactId&gt; &lt;version&gt;3.1.0.RELEASE&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.springframework.security&lt;/groupId&gt; &lt;artifactId&gt;spring-security-taglibs&lt;/artifactId&gt; &lt;version&gt;3.1.0.RELEASE&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.springframework.security&lt;/groupId&gt; &lt;artifactId&gt;spring-security-ldap&lt;/artifactId&gt; &lt;version&gt;3.1.0.RELEASE&lt;/version&gt; &lt;/dependency&gt; &lt;!-- Jackson JSON Mapper --&gt; &lt;dependency&gt; &lt;groupId&gt;org.codehaus.jackson&lt;/groupId&gt; &lt;artifactId&gt;jackson-mapper-asl&lt;/artifactId&gt; &lt;version&gt;1.6.4&lt;/version&gt; &lt;/dependency&gt; &lt;/dependencies&gt; &lt;build&gt; &lt;finalName&gt;acme&lt;/finalName&gt; &lt;plugins&gt; &lt;plugin&gt; &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt; &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt; &lt;version&gt;2.3.2&lt;/version&gt; &lt;configuration&gt; &lt;source&gt;1.6&lt;/source&gt; &lt;target&gt;1.6&lt;/target&gt; &lt;/configuration&gt; &lt;/plugin&gt; &lt;/plugins&gt; &lt;/build&gt; &lt;/project&gt; </code></pre>
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