when trying to run struts2 with eclipse juno server,getting HTTP Status 404 error

Question

This is the error i am getting on my eclipse server page:

There is no Action mapped for namespace [/] and action name [trial] associated with context path [/StrutsTrial6].

This is my web.xml file

<?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: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>StrutsTrial6</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <filter>
  <filter-name>struts2</filter-name>
  <filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  <filter-mapping>
  <filter-name>struts2</filter-name>
  <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

This is my struts.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<struts>
<package name="default" extends="struts-default">
<action name="trial" namespace="/" class="first.FirstBean">
<result name="success">/first.jsp</result>
</action>
</package>
</struts>

This is my input jsp page:

<%@ taglib uri="/struts-tags" prefix="s" %>
<s:form action="trial">
<s:textfield name="name" label="NAME"></s:textfield>
<s:submit value="save"></s:submit>
</s:form>

This is my output jsp page:

<%@ taglib uri="/struts-tags" prefix="s" %>
name:<s:property value="name"/>

This is pom.xml file:

<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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>StrutsTrial6</groupId>
  <artifactId>StrutsTrial6</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <dependencies>
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.2</version>
    </dependency>
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.4</version>
    </dependency>
    <dependency>
      <groupId>commons-lang</groupId>
      <artifactId>commons-lang</artifactId>
      <version>2.4</version>
    </dependency>
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-lang3</artifactId>
      <version>3.4</version>
    </dependency>
    <dependency>
      <groupId>commons-logging</groupId>
      <artifactId>commons-logging</artifactId>
      <version>1.1.3</version>
    </dependency>
    <dependency>
      <groupId>org.freemarker</groupId>
      <artifactId>freemarker</artifactId>
      <version>2.3.23</version>
    </dependency>
    <dependency>
      <groupId>org.javassist</groupId>
      <artifactId>javassist</artifactId>
      <version>3.20.0-GA</version>
    </dependency>
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-api</artifactId>
      <version>2.7</version>
    </dependency>
    <dependency>
      <groupId>ognl</groupId>
      <artifactId>ognl</artifactId>
      <version>3.1.12</version>
    </dependency>
    <dependency>
      <groupId>org.apache.struts</groupId>
      <artifactId>struts2-core</artifactId>
      <version>2.5.10.1</version>
    </dependency>
    <dependency>
      <groupId>org.apache.tomcat</groupId>
      <artifactId>tomcat-servlet-api</artifactId>
      <version>7.0.56</version>
    </dependency>
  </dependencies>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.3</version>
        <configuration>
          <warSourceDirectory>WebContent</warSourceDirectory>
          <failOnMissingWebXml>false</failOnMissingWebXml>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

I've been stuck with this error from past 10 hours. I've also found that sometimes, when I am changing some code in my project, Eclipse server does not update my project and instead it runs my earlier code, so please tell me why my eclipse is showing such a srange behaviour.Thanks in advance..

This is the Screenshot of Config Browser page:

This is the same page i am getting whether i am using namespace="/" in package or not using namespace , and in this page their is no action defined in Actions in Default column.

Answer 1

To debug this kind of problems:

Add this

<dependency>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts2-config-browser-plugin</artifactId>
    <version>2.5.10.1</version>
</dependency>

to your pom.xml, deploy, then open the following URL:

http://localhost:8080/YOUR_PROJECT_NAME/config-browser/index.action

and discover how your actions are mapped as described here.

IMPORTANT: remember to remove it before going to production, or it will be a serious security flaw.

---

Your specific problem(s):

1. Syntax errors on struts.xml:

   <package name="default" extends="struts-default">
       <action name="trial" namespace="/" class="first.FirstBean">
           <result name="success">/first.jsp</result>
       </action>
   </package>
   

   <action> has no namespace attribute, <package> does:

   <package name="default" extends="struts-default" namespace="/" >
       <action name="trial" class="first.FirstBean">
           <result name="success">/first.jsp</result>
       </action>
   </package>
   

   _{NOTE: don't call an Action FirstBean, since actions are not beans, actions should contain beans and expose them through getters and setters. Actions are controllers and part of the model, not just model (like a bean would be).}

2. You were not hitting the syntax errors because you're not reading the struts.xml. It is in WEB-INF, but it should stay on the root of the classpath, hence in src/main/resources, that at build time will be copied by Maven into WEB-INF/classes

Also note that WebContent/WEB-INF is not the default Maven structure generated by archetypes, which should be src/main/webapp/WEB-INF...

You would have never hit any of this errors if you'd have started from a maven archetype for the generation of your project (that instead you did manually, or with Eclipse, both discouraged ways ;)