java.lang.ClassNotFoundException：启动Simple Struts2应用程序时的org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter [英] java.lang.ClassNotFoundException: org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter when starting Simple Struts2 Application

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本文介绍了java.lang.ClassNotFoundException：启动Simple Struts2应用程序时的org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在尝试运行一个简单的Struts2应用程序，但总是会抛出以下异常：

  java.lang.ClassNotFoundException： org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter

我已经按照一步一步的教程在 http://struts.apache.org/development/2.x/docs/create-struts-2-web-application-using-maven-to-manage-artifacts-和-to-build-the-application.html ，但我无法使其工作。
我也设法找到其他使用maven但是都失败的Struts2教程。我尝试运行应用程序时会抛出同样的异常。



我使用了以下内容：




  • Eclipse

  • Maven

  • Tomcat

  • Struts2



根据其他讨论，依赖项jar文件（例如struts2-core）必须放在lib文件夹上，但对于我来说，我使用Maven，所以所有的依赖已经包含在我的Maven依赖关系下的构建路径中。



我甚至尝试运行Struts2网站中提供的示例项目（ Basic_Struts_2_Maven_2_3_1_2.zip ），但我还是没有运气。构建它是成功的，但在服务器上运行它总是失败。



我是否缺少任何东西？



这里是 web.xml ： 

 <？xml version =1.0 encoding =UTF-8？> 
< web-app id =WebApp_IDversion =2.4xmlns =http://java.sun.com/xml/ns/j2eexmlns：xsi =http：//www.w3 .org / 2001 / XMLSchema-instancexsi：schemaLocation =http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd > 
< display-name> Basic_Struts2_Maven< / 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.ng.filter.StrutsPrepareAndExecuteFilter< / filter-class> 
< / filter> 
< filter-mapping> 
< filter-name> struts2< / filter-name> 
< url-pattern> / *< / url-pattern> 
< / filter-mapping> 
< / web-app>

pom.xml / strong> 

 < project xmlns =http://maven.apache.org/ POM / 4.0.0xmlns：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\"> 
< modelVersion> 4.0.0< / modelVersion> 
< groupId> manning< / groupId> 
< artifactId> Basic_Struts2_Mvn< / artifactId> 
< packaging> war< / packaging> 
< version> 0.0.1-SNAPSHOT< / version> 
< name> Basic Struts 2< / name> 
<属性> 
< project.build.sourceEncoding> UTF-8< /project.build.sourceEncoding> 
< / properties> 
< build> 
< finalName> Basic_Struts2_Mvn< / finalName> 
< plugins> 
< plugin> 
< groupId> org.apache.maven.plugins< / groupId> 
< artifactId> maven-compiler-plugin< / artifactId> 
< version> 2.3.2< / version> 
< configuration> 
< source> 1.6< / source> 
< target> 1.6< / target> 
< / configuration> 
< / plugin> 
< / plugins> 
< / build> 
<依赖关系> 
<依赖关系> 
< groupId> org.apache.struts< / groupId> 
< artifactId> struts2-core< / artifactId> 
< version> 2.3.1.2< / version> 
< / dependency> 
<依赖关系> 
< groupId> log4j< / groupId> 
< artifactId> log4j< / artifactId> 
< version> 1.2.14< / version> 
< / dependency> 
< / dependencies> 
< / project>

struts.xml / strong> 

 <？xml version =1.0encoding =UTF-8 ？> 
<！DOCTYPE struts PUBLIC 
 -  // Apache Software Foundation // DTD Struts Configuration 2.0 // EN
http://struts.apache.org/dtds/struts- 2.0.dtd> 
< struts> 
< constant name =struts.devModevalue =true/> 
< package name =basicstruts2extends =struts-default> 
< action name =index> 
< result> /index.jsp< / result> 
< / action> 
< / package> 
< / struts>

.classpath strong> 

 <？xml version =1.0encoding =UTF-8？ > 
< classpath> 
< classpathentry kind =srcoutput =target / classespath =src / main / java/> 
< classpathentry exclud =**kind =srcoutput =target / classespath =src / main / resources/> 
< classpathentry kind =srcoutput =target / test-classespath =src / test / java/> 
< classpathentry exclud =**kind =srcoutput =target / test-classespath =src / test / resources/> 
< classpathentry kind =conpath =org.eclipse.jdt.launching.JRE_CONTAINER / org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType / J2SE-1.5/> 
< classpathentry kind =conpath =org.maven.ide.eclipse.MAVEN2_CLASSPATH_CONTAINER/> 
< classpathentry kind =conpath =org.eclipse.jst.j2ee.internal.web.container/> 
< classpathentry kind =conpath =org.eclipse.jst.j2ee.internal.module.container/> 
< classpathentry kind =outputpath =target / classes/> 
< / classpath>


解决方案

使用此命令将Maven项目转换为Dynamic Web Project对于Eclipse：

  mvn eclipse：eclipse -Dwtpversion = 3.4.2 
  pre> 
 
 
您可以更改任何使用的WTP版本
 
 
 
  .classpath 应该是这样的
 < classpath> 
< classpathentry kind =srcpath =src / main / javainclude =** / *。java/> 
< classpathentry kind =srcpath =src / main / resourcesexclud =** / *。java/> 
< classpathentry kind =outputpath =target / classes/> 
< classpathentry kind =varpath =M2_REPO / asm / asm / 3.3 / asm-3.3.jar/> 
< classpathentry kind =varpath =M2_REPO / asm / asm-commons / 3.3 / asm-commons-3.3.jar/> 
< classpathentry kind =varpath =M2_REPO / asm / asm-tree / 3.3 / asm-tree-3.3.jar/> 
< classpathentry kind =varpath =M2_REPO / commons-fileupload / commons-fileupload / 1.2.2 / commons-fileupload-1.2.2.jar/> 
< classpathentry kind =varpath =M2_REPO / commons-io / commons-io / 2.0.1 / commons-io-2.0.1.jar/> 
< classpathentry kind =varpath =M2_REPO / commons-lang / commons-lang / 2.5 / commons-lang-2.5.jar/> 
< classpathentry kind =varpath =M2_REPO / org / freemarker / freemarker / 2.3.18 / freemarker-2.3.18.jar/> 
< classpathentry kind =varpath =M2_REPO / javassist / javassist / 3.11.0.GA / javassist-3.11.0.GA.jar/> 
< classpathentry kind =varpath =M2_REPO / junit / junit / 3.8.1 / junit-3.8.1.jar/> 
< classpathentry kind =varpath =M2_REPO / ognl / ognl / 3.0.4 / ognl-3.0.4.jar/> 
< classpathentry kind =varpath =M2_REPO / org / apache / struts / struts2-core / 2.3.1.2 / struts2-core-2.3.1.2.jar/> 
< classpathentry kind =libpath =C：/ Program Files / Java / jdk1.6.0_32 / lib / tools.jar/> 
< classpathentry kind =varpath =M2_REPO / org / apache / struts / xwork / xwork-core / 2.3.1.2 / xwork-core-2.3.1.2.jar/> 
< classpathentry kind =conpath =org.eclipse.jdt.launching.JRE_CONTAINER/> 
< / classpath> 
  
构建WAR文件后，应部署到％CATALINA_BASE％\webapps 。
 
I am trying to run a simple Struts2 application but it always throw the following exception:
java.lang.ClassNotFoundException: org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter

I have followed the step by step tutorial in http://struts.apache.org/development/2.x/docs/create-struts-2-web-application-using-maven-to-manage-artifacts-and-to-build-the-application.html but I cannot make it work.
I also managed to find other Struts2 tutorial which uses maven but all failed. It throws the same exception when I try to run the application.



I used the following:



    

  • Eclipse 
    • 

  • Maven
    • 

  • Tomcat
    • 

  • Struts2
    • 




According to other discussions, the dependencies jar files(e.g. struts2-core) must be put on the lib folder but as for me, I am using Maven so all the dependencies are already included in my build path under Maven Dependencies.



I even tried running the sample project given in Struts2 website (Basic_Struts_2_Maven_2_3_1_2.zip) but I still have no luck. Building it is successful but running it on server always fail. 



Am I missing anything?



Here's the web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>Basic_Struts2_Maven</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.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
     <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

pom.xml:
<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">
    <modelVersion>4.0.0</modelVersion>
    <groupId>manning</groupId>
    <artifactId>Basic_Struts2_Mvn</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>Basic Struts 2</name>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <build>
        <finalName>Basic_Struts2_Mvn</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>org.apache.struts</groupId>
            <artifactId>struts2-core</artifactId>
            <version>2.3.1.2</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.14</version>
        </dependency>
    </dependencies>
</project>

struts.xml:
<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
        "http://struts.apache.org/dtds/struts-2.0.dtd">
    <struts>
        <constant name="struts.devMode" value="true" />
        <package name="basicstruts2" extends="struts-default">
            <action name="index">
                <result>/index.jsp</result>
            </action>
        </package>
    </struts>

.classpath:
<?xml version="1.0" encoding="UTF-8"?>
<classpath>
    <classpathentry kind="src" output="target/classes" path="src/main/java"/>
    <classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources"/>
    <classpathentry kind="src" output="target/test-classes" path="src/test/java"/>
    <classpathentry excluding="**" kind="src" output="target/test-classes" path="src/test/resources"/>
    <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/J2SE-1.5"/>
    <classpathentry kind="con" path="org.maven.ide.eclipse.MAVEN2_CLASSPATH_CONTAINER"/>
    <classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.web.container"/>
    <classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.module.container"/>
    <classpathentry kind="output" path="target/classes"/>
</classpath>



 解决方案 
Use this command to convert Maven project to Dynamic Web Project for Eclipse:
mvn eclipse:eclipse -Dwtpversion=3.4.2

you may change whatever WTP version you use



.classpath should be like this
<classpath>
  <classpathentry kind="src" path="src/main/java" including="**/*.java"/>
  <classpathentry kind="src" path="src/main/resources" excluding="**/*.java"/>
  <classpathentry kind="output" path="target/classes"/>
  <classpathentry kind="var" path="M2_REPO/asm/asm/3.3/asm-3.3.jar"/>
  <classpathentry kind="var" path="M2_REPO/asm/asm-commons/3.3/asm-commons-3.3.jar"/>
  <classpathentry kind="var" path="M2_REPO/asm/asm-tree/3.3/asm-tree-3.3.jar"/>
  <classpathentry kind="var" path="M2_REPO/commons-fileupload/commons-fileupload/1.2.2/commons-fileupload-1.2.2.jar" />
  <classpathentry kind="var" path="M2_REPO/commons-io/commons-io/2.0.1/commons-io-2.0.1.jar"/>
  <classpathentry kind="var" path="M2_REPO/commons-lang/commons-lang/2.5/commons-lang-2.5.jar"/>
  <classpathentry kind="var" path="M2_REPO/org/freemarker/freemarker/2.3.18/freemarker-2.3.18.jar"/>
  <classpathentry kind="var" path="M2_REPO/javassist/javassist/3.11.0.GA/javassist-3.11.0.GA.jar"/>
  <classpathentry kind="var" path="M2_REPO/junit/junit/3.8.1/junit-3.8.1.jar"/>
  <classpathentry kind="var" path="M2_REPO/ognl/ognl/3.0.4/ognl-3.0.4.jar"/>
  <classpathentry kind="var" path="M2_REPO/org/apache/struts/struts2-core/2.3.1.2/struts2-core-2.3.1.2.jar"/>
  <classpathentry kind="lib" path="C:/Program Files/Java/jdk1.6.0_32/lib/tools.jar"/>
  <classpathentry kind="var" path="M2_REPO/org/apache/struts/xwork/xwork-core/2.3.1.2/xwork-core-2.3.1.2.jar"/>
  <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
</classpath>

After build the WAR file should deploy to %CATALINA_BASE%\webapps.


                        
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