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问面向org.springframework.web.servlet.DispatcherServlet :java.lang.ClassNotFoundException
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Stack Overflow用户

提问于 2020-08-01 16:16:36

回答 2查看 218关注 0票数 2

在启动服务器时，我会收到这个错误：

org.springframework.web.servlet.DispatcherServlet：

java.lang.ClassNotFoundException

我的pom.xml文件内容：

<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>com.ccc</groupId>
  <artifactId>ccc</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>ccc</name>
  <description>ccc</description>
  
  <dependencies>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>${hibernate.version}</version>
        </dependency>
        <dependency>
            <groupId>org.assertj</groupId>
            <artifactId>assertj-core</artifactId>
            <version>${assertj-core.version}</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.h2database/h2 -->
<dependency>
    <groupId>com.h2database</groupId>
    <artifactId>h2</artifactId>
    <version>1.4.200</version>
    <scope>test</scope>
</dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-spatial</artifactId>
            <version>${hibernate.version}</version>
        </dependency>
       <!-- https://mvnrepository.com/artifact/org.opengeo/geodb -->
        <!-- <dependency>
            <groupId>org.opengeo</groupId>
            <artifactId>geodb</artifactId>
            <version>0.7</version>
        </dependency> -->
        <dependency> 
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>
        <dependency>
            <groupId>ch.vorburger.mariaDB4j</groupId>
            <artifactId>mariaDB4j</artifactId>
            <version>${mariaDB4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-testing</artifactId>
            <version>${hibernate.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.11.1</version>
        </dependency>

        <dependency>
            <groupId>org.openjdk.jmh</groupId>
            <artifactId>jmh-generator-annprocess</artifactId>
            <version>${openjdk-jmh.version}</version>
        </dependency>
        
        <!-- spring related jars below this line -->
        
        <!-- spring-context which provides core functionality -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.1.6.RELEASE</version>
        </dependency>
 
        <!-- The spring-aop module provides an AOP Alliance-compliant aspect-oriented 
            programming implementation allowing you to define -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>4.1.6.RELEASE</version>
        </dependency>
 
        <!-- The spring-webmvc module (also known as the Web-Servlet module) contains 
            Spring’s model-view-controller (MVC) and REST Web Services implementation 
            for web applications -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.1.6.RELEASE</version>
        </dependency>
 
        <!-- The spring-web module provides basic web-oriented integration features 
            such as multipart file upload functionality and the initialization of the 
            IoC container using Servlet listeners and a web-oriented application context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>4.1.6.RELEASE</version>
        </dependency>
        
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-context</artifactId>
          <version>4.1.6.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/org.springframework.transaction -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.1.6.RELEASE</version>
        </dependency>
        
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>4.1.6.RELEASE</version>
        </dependency>
        

        <!-- https://mvnrepository.com/artifact/org.springframework/org.springframework.beans -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>4.1.6.RELEASE</version>
        </dependency>


<!--  spring jars above this line-->
            
        <!--  javax jar to remove issue with jsp file -->
        <!-- <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>javax.servlet-api</artifactId>
          <version>4.0.1</version>
        </dependency>    -->
        <!-- https://mvnrepository.com/artifact/javax.validation/validation-api -->
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>2.0.1.Final</version>
        </dependency>
        
        <!-- https://mvnrepository.com/artifact/javax.servlet.jsp.jstl/javax.servlet.jsp.jstl-api -->
        <dependency>
            <groupId>javax.servlet.jsp.jstl</groupId>
            <artifactId>javax.servlet.jsp.jstl-api</artifactId>
            <version>1.2.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.glassfish.web/javax.servlet.jsp.jstl -->
        <dependency>
            <groupId>org.glassfish.web</groupId>
            <artifactId>javax.servlet.jsp.jstl</artifactId>
            <version>1.2.5</version>
        </dependency>
        
    </dependencies>
    
    <build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.5.1</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
</build>
    <properties>
        <hibernate.version>5.4.19.Final</hibernate.version>
        <mysql.version>8.0.21</mysql.version>
        <mariaDB4j.version>2.2.3</mariaDB4j.version>
        <assertj-core.version>3.8.0</assertj-core.version>
        <openjdk-jmh.version>1.21</openjdk-jmh.version>
        <geodb.version>0.9</geodb.version>
        <spring.version>4.1.6.RELEASE</spring.version>
    </properties>
  
</project>

最后，我要注意的一点是，依赖关系：

所有春季框架jars都是在运行时在Project中选择的相同的version.

Tomcat 9.0。

mvn干净安装-构建成功。

mvn eclipse:eclipse -构建sucess.

cleaned .m2/存储库和更新的maven.

>G 216

我的web.xml内容：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>ccc</display-name>

  <absolute-ordering />

  <welcome-file-list>
    <welcome-file>home.jsp</welcome-file>
    <welcome-file>home.html</welcome-file>
  </welcome-file-list>

  <servlet>
    <servlet-name>dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>/WEB-INF/spring-mvc-crud-demo-servlet.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  
  <servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

有关web.xml的注意事项：

WEB-INF/view

home.jsp文件放置在-INF

jars中，应该放置在WEB/lib中，使用部署程序集进行定向。添加了maven依赖项。因此没有创建WEB/lib.

这些是我对我所面临的问题的见解。我尝试过在stackoverflow.com，youtube.com和其他网站上提供的所有其他解决方案。

更新：

我想，根据请求向WEB/lib添加错误stack.

adding jars的

是不必要的，因为我在部署程序集中使用进行同样的操作！如果我错了，请纠正并指导我。--

下面是错误堆栈：

  SEVERE: Servlet [dispatcher] in web application [/ccc] threw load() exception
    java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet
        at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1365)
        at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1188)
        at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:539)
        at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:520)
        at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:150)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1042)
        at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:983)
        at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4864)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5173)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
        at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)
        at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)
        at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
        at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)
        at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)
        at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
        at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
        at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:738)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:342)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:473)

java

spring

maven

jsp

servlets

回答 2

Stack Overflow用户

发布于 2020-08-01 17:43:41

遵循以下步骤：

dependencies.

Force

右键单击项目、->属性、->部署程序集、->添加

、选择Java路径条目-> Maven、更新maven并在Tomcat

上重新部署maven项目、重启Tomcat.

我们需要将Java构建路径指向Maven依赖项，因为tomcat不知道您的构建操作。默认情况下，它将从WEB/lib目录中找到JAR。

票数 0

Stack Overflow用户

发布于 2020-08-02 16:21:25

在版本标签下的pom.xml中，添加以下内容：

<packaging>war</packaging>

如果您正在pom.xml中的依赖项下使用嵌入式tomcat，那么添加以下内容

<dependency>
 <groupId>org.apache.tomcat.embed</groupId>
 <artifactId>tomcat-embed-jasper</artifactId>
 <scope>provided</scope>
</dependency>

票数 0

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/63207377

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