我刚刚通过ubuntu软件包管理器安装了tomcat。我打开日志，看到的第一件事是一个有趣的异常。
java.lang.NoClassDefFoundError：org / springframework / asm / ClassVisitor
我在安装中缺少什么吗？
应该说，我首先重新安装的原因是我第一次使用Tomcat来进行Web服务，但是那没有用。但是现在：为什么我会收到此异常？我出于好意而粘贴了整个日志：
Feb 13, 2012 10:00:17 PM org.apache.catalina.core.ApplicationContext log INFO: Initializing Spring root WebApplicationContext Feb 13, 2012 10:00:17 PM org.apache.catalina.core.StandardContext listenerStart SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener java.lang.NoClassDefFoundError: org/springframework/asm/ClassVisitor at org.springframework.context.support.AbstractRefreshableApplicationContext.customizeBeanFactory(AbstractRefreshableApplicationContext.java:218) at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129) at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:467) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:397) at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:282) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:204) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3972) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4467) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526) at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:905) at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:740) at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:500) at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277) at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053) at org.apache.catalina.core.StandardHost.start(StandardHost.java:722) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443) at org.apache.catalina.core.StandardService.start(StandardService.java:516) at org.apache.catalina.core.StandardServer.start(StandardServer.java:710) at org.apache.catalina.startup.Catalina.start(Catalina.java:593) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414) Caused by: java.lang.ClassNotFoundException: org.springframework.asm.ClassVisitor at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1484) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1329) ... 31 more Feb 13, 2012 10:00:17 PM org.apache.catalina.core.ApplicationContext log INFO: Closing Spring root WebApplicationContext Feb 13, 2012 10:02:30 PM org.apache.catalina.core.ApplicationContext log INFO: Initializing Spring root WebApplicationContext Feb 13, 2012 10:02:30 PM org.apache.catalina.core.StandardContext listenerStart SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener java.lang.NoClassDefFoundError: org/springframework/asm/ClassVisitor at org.springframework.context.support.AbstractRefreshableApplicationContext.customizeBeanFactory(AbstractRefreshableApplicationContext.java:218) at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129) at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:467) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:397) at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:282) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:204) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3972) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4467) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526) at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:905) at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:740) at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:500) at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277) at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053) at org.apache.catalina.core.StandardHost.start(StandardHost.java:722) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443) at org.apache.catalina.core.StandardService.start(StandardService.java:516) at org.apache.catalina.core.StandardServer.start(StandardServer.java:710) at org.apache.catalina.startup.Catalina.start(Catalina.java:593) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414) Caused by: java.lang.ClassNotFoundException: org.springframework.asm.ClassVisitor at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1484) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1329) ... 31 more Feb 13, 2012 10:02:30 PM org.apache.catalina.core.ApplicationContext log INFO: Closing Spring root WebApplicationContext
看起来Tomcat正在尝试部署依赖于Spring ASM的Web应用程序，但它无法在类路径上找到Spring ASM的JAR文件。我不确定您的Web应用程序正在使用哪个版本的Spring，但是该JAR文件的最新版本（截至今天）是3.1.0.RELEASE。
如果使用的是Maven，则可以通过将缺少的JAR文件添加到项目的pom.xml中来将其添加到项目中：
<dependency> <groupId>org.springframework</groupId> <artifactId>org.springframework.asm</artifactId> <version>3.1.0.RELEASE</version> </dependency>
如果您不使用Maven管理依赖项，则可以从http：//www.springsource下载整个Spring框架，以获得org.springframework.asm-3.1.0.RELEASE.jar（或所需的任何版本）。.org / spring-community-download。然后，需要将ASM jar文件放置在项目的WEB-INF / lib文件夹中。
