启动tomcat时出现ClassNotFoundException错误答案

【问题标题】：ClassNotFoundException Error when starting tomcat启动tomcat时出现ClassNotFoundException错误
【发布时间】：2014-12-30 15:01:12
【问题描述】：

我正在尝试从 eclipse 设置 tomcat 服务器，但是这个错误困扰了我很长时间，我没有找到任何解决方案..

我试过了：

将 spring-context、spring-core、spring-web 依赖项添加到类路径中。
修改项目属性（部署程序集部分）。
清理 tomcat 服务器目录。

这是我的web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app 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">

    <!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring/root-context.xml</param-value>
    </context-param>

    <!-- Creates the Spring Container shared by all Servlets and Filters -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- Processes application requests -->
    <servlet>
        <servlet-name>appServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>appServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

这是跟踪：

Nov 03, 2014 5:40:26 PM com.springsource.tcserver.security.PropertyDecoder <init>
INFO: tc Runtime property decoder using memory-based key
Nov 03, 2014 5:40:27 PM com.springsource.tcserver.security.PropertyDecoder <init>
INFO: tcServer Runtime property decoder has been initialized in 153 ms
Nov 03, 2014 5:40:27 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Nov 03, 2014 5:40:28 PM com.springsource.tcserver.serviceability.rmi.JmxSocketListener init
INFO: Started up JMX registry on 127.0.0.1:6969 in 189 ms
Nov 03, 2014 5:40:28 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 1258 ms
Nov 03, 2014 5:40:28 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Nov 03, 2014 5:40:28 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: VMware vFabric tc Runtime 2.8.2.RELEASE/7.0.35.B.RELEASE
Nov 03, 2014 5:40:28 PM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor /home/karim/Downloads/.springsource/vfabric-tc-server-developer-2.8.2.RELEASE/base-instance/conf/Catalina/localhost/task-manager.xml
Nov 03, 2014 5:40:28 PM org.apache.catalina.startup.SetContextPropertiesRule begin
WARNING: [SetContextPropertiesRule]{Context} Setting property 'source' to 'org.eclipse.jst.jee.server:task-manager' did not find a matching property.
Nov 03, 2014 5:40:28 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Error configuring application listener of class org.springframework.web.context.ContextLoaderListener
java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
    at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:527)
    at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:509)
    at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:137)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4733)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5291)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:657)
    at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1637)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

拜托，如果您需要其他东西，请告诉我。

【问题讨论】：

你确认spring jars在部署的war中了吗？
我该怎么做？，spring-aop，spring-beans，spring-context，spring-core，spring-expression，spring-web，spring-webmvc都包含在war中。跨度>
我希望你已经在 WEB-INF/Libs 中添加了 JARS。因为只有这样 JEE 类加载器才能加载它们

标签： java spring tomcat gradle

【解决方案1】：

有问题的类在 spring-web-?????RELEASE.jar 中。去你的战争，用 winzip 或 7Zip 之类的打开它，然后在 WEB-INF/lib 中查找 jar，我猜它不存在。如果您使用 maven 将依赖项包含为：

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

如果您没有使用 maven，并且我想您是在 Eclipse 中执行此操作，正如您提到的部署程序集，您必须将用于使这些 jar 可用于您的编译的任何库添加到 eclipse 构建中。或者您可以简单地将 jar 移动到 WEB-INF/lib。

在构建 jar 文件后检查你的战争。

【讨论】：