ClassNotFoundException: org.springframework.web.servlet. DispatcherServlet

我使用的是 Spring 3.1.0发布，我的 servlet 容器是 雄猫7号，我的 IDE 是 < strong > eclipse靛蓝 以及包含 调度员 Servlet的罐子 Spring-webmvc-3.1.0. RELEASE.jar 存在于 lib 文件夹中，但是在运行应用程序时，我遇到了一个异常:

java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:525)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:507)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:126)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1099)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1043)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4957)
at org.apache.catalina.core.StandardContext$3.call(StandardContext.java:5284)
at org.apache.catalina.core.StandardContext$3.call(StandardContext.java:5279)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)

请告诉我为什么我得到这个例外，以及如何修复它。

编辑: 以下是我的配置文件:

1-. SpringBeans:

<?xml version="1.0" encoding="UTF-8"?>
<beansProjectDescription>
<version>1</version>
<pluginVersion><![CDATA[2.9.0.201203011806-RELEASE]]></pluginVersion>
<configSuffixes>
<configSuffix><![CDATA[xml]]></configSuffix>
</configSuffixes>
<enableImports><![CDATA[false]]></enableImports>
<configs>
<config>src/main/webapp/WEB-INF/checkout-servlet.xml</config>
</configs>
<configSets>
</configSets>
</beansProjectDescription>

2-web.xml:

<web-app>
<display-name>Checkout</display-name>


<servlet>
<servlet-name>checkout</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>


<servlet-mapping>
<servlet-name>checkout</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>


</web-app>

3-checkout-servlet. xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">


<context:component-scan base-package="com.myapp"/>


<bean id="myService" class="com.myapp.MyService"/>


</beans>

当我试图访问应用程序中的任何页面时，我也会遇到例外情况:

HTTP Status 404 - Servlet checkout is not available


type Status report


message Servlet checkout is not available


description The requested resource (Servlet checkout is not available) is not available.
Apache Tomcat/7.0.22
368082 次浏览
小开

Two possible answers:

1- You did not include spring-beans and spring-context jars in your lib. If you are using maven (which will help a lot) those two lines will be enough

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>3.1.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>3.1.0.RELEASE</version>
</dependency>

2- The necessary jars are in your classpath but are not deployed on tomcat.

小开
最佳答案

i found that in the deployment assembly, there was the entry:

[persisted container] org.maven.ide.eclipse.maven2_classpath_container

i removed it, and added the maven dependencies entry, and it works fine now.

小开

You need to add the "Maven Dependency" in the Deployment Assembly

  • right click on your project and choose properties.
  • click on Deployment Assembly.
  • click add
  • click on "Java Build Path Entries"
  • select Maven Dependencies"
  • click Finish.

Rebuild and deploy again

Note: This is also applicable for non maven project.

小开

In my case I get this trouble after using the maven's update project utility. I tried all the workarounds you suggested but nothing seemed to work. At the end the solution was simply to remove the project from the server to ensure that it was clean, and add it again. Then it works, I hope this solution could help any of you.

小开

I had the same problem with Idea Intellij and Spring 4. I fixed the problem and I wanted to share the answer with you.

I use tomcat 7 / idea intellij 13 / spring 4.

pom.xml dependencies:

  <properties>
<spring.version>4.0.5.RELEASE</spring.version>
</properties>


<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>


<dependency>
enter code here
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>


<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>


<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>


<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>


<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
<scope>test</scope>
</dependency>


<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>


<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.2</version>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
</dependencies>

In idea Intellij, you need to go to File -> Project Settings -> Artifacts.

Then enter image description here

clean -> rebuild the project -> build the artifact, and everything will be ok.

小开

I was facing the same Issue. When I saw into maven repository .m2 folder(....m2\repository\org\springframework\spring-webmvc) in my local I found two 3.2.0.RELEASE folders. SO I removed one. Then I went to project, right click->properties->deployment essembly-> add maven dependencies. clean build and then restart the server. Then the DispatcherServlet got loaded.

小开

If all of these advice doesn't work, you should re-create your Server (Tomcat or like that). That solved my problem.

小开

I solved by following these steps:

  • Right click in the project > Configure > Convert to Maven project
  • After the conversion, right click in the project > Maven > Update project

This fixes the "Deployment Assembly" settings of the project.

小开

Include below dependency in your pom.xml

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>{spring-version}</version>
</dependency>
小开

You can use GlassFish server and the error will be resolved. I tried with tomcat7 and tomcat8 but this error was coming continuously but resolved with GlassFish. I think it's a problem with server.

These are the results with tomcat7: Results with tomcat7

Here are the results with GlassFish: Results with GlassFish

小开

Move the jar files from your classpath to web-inf/lib, and run a new tomcat server.

小开

right click on your project and choose properties. click on Deployement Assembly. click add click on "Java Build Path Entries" select Maven Dependencies" click Finish.

小开

I found a simple solution, Simply add your jars inside WEB-INF-->lib folder..

小开

This solves the problem for me. It's easy and pretty simply explained.

Step 1

  • Right click on project
  • Click on Properties

Step 2

  • Click on Deployment Assembly Tab in the
  • Click Add...

Step 3

  • Click on Java Build Path Entries

Step 4

  • Click on Maven Dependencies
  • Click Finish button

Step 5

  • Redeploy Spring MVC application to Tomcat again
  • Restart Tomcat
  • List item

classnotfoundexception

小开

I had this same issue in WebSphere, but couldn't find a solution even though I verified the Spring dependencies were there and it ran in tomcat just fine. I ended up uninstalling the application and was still getting the error so I think WebSphere was hanging onto some corrupt instance.

To fix the issue I had to reinstall the application, stop it, uninstall it and then reinstall it.

小开

For me it was a mistake in the pom.xml - I'd set <scope>provided<scope> on my dependencies, and this was making them not get copied during the mvn package stage.

My symptoms were the error message the OP posted, and that the jars were not included in the WEB-INF/lib path inside the .war after package was run. When I removed the scope, the jars appeared in the output, and all loads up fine now.

小开

It may be useful for someone, so I'll post it here. I was missing this dependency on my pom.xml

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
小开
  1. Go to properties of Project which your working
  2. Choose the Deployment Assembly menu and Click on add button
  3. opt the Java Build Path Entries and Click on Maven Dependencies
  4. Build the project and run

enter image description here


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