Tomcat 7 ClassNotFoundException：org.apache.tomcat.JarScanner [重复]答案

【问题标题】：Tomcat 7 ClassNotFoundException: org.apache.tomcat.JarScanner [duplicate]Tomcat 7 ClassNotFoundException：org.apache.tomcat.JarScanner [重复]
【发布时间】：2012-09-29 00:45:21
【问题描述】：

当我尝试启动我的应用程序时，我收到此错误。我已经验证 JarScanner 存在于 CATALINA_HOME 目录中，所以我不知道为什么它找不到它。有什么可能导致我的应用启动时出现这个问题吗？

Oct 8, 2012 1:24:01 PM org.apache.catalina.core.ContainerBase addChildInternal
SEVERE: ContainerBase.addChild: start: 
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/client]]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
    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:618)
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:650)
    at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1582)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    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)
Caused by: java.lang.NoClassDefFoundError: org/apache/tomcat/JarScanner
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:295)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at org.apache.catalina.core.StandardContext.getJarScanner(StandardContext.java:1025)
    at org.apache.catalina.startup.ContextConfig.processJarsForWebFragments(ContextConfig.java:1911)
    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1265)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:369)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5173)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    ... 11 more
Caused by: java.lang.ClassNotFoundException: org.apache.tomcat.JarScanner
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    ... 33 more
Oct 8, 2012 1:24:01 PM org.apache.catalina.startup.HostConfig deployDescriptor
SEVERE: Error deploying configuration descriptor /software/sirsi/tomcat_sbox7/conf/Catalina/localhost/client.xml
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/client]]
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:904)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:618)
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:650)
    at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1582)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    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$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)
Oct 8, 2012 1:24:01 PM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor /software/sirsi/tomcat_sbox7/conf/Catalina/localhost/custom.xml
Oct 8, 2012 1:24:01 PM org.apache.catalina.core.StandardContext setPath
WARNING: A context path must either be an empty string or start with a '/'. The path [custom] does not meet these criteria and has been changed to [/custom]
Oct 8, 2012 1:24:01 PM org.apache.catalina.startup.SetContextPropertiesRule begin
WARNING: [SetContextPropertiesRule]{Context} Setting property 'debug' to '0' did not find a matching property.
Oct 8, 2012 1:24:01 PM org.apache.catalina.core.ContainerBase addChildInternal
SEVERE: ContainerBase.addChild: start: 
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/custom]]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:618)
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:650)
    at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1582)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    at java.util.concurrent.FutureTask$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)
Caused by: java.lang.NoClassDefFoundError: org/apache/tomcat/util/scan/StandardJarScanner
    at org.apache.catalina.core.StandardContext.getJarScanner(StandardContext.java:1025)
    at org.apache.catalina.startup.ContextConfig.processJarsForWebFragments(ContextConfig.java:1911)
    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1265)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:369)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5173)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    ... 11 more
Oct 8, 2012 1:24:01 PM org.apache.catalina.startup.HostConfig deployDescriptor
SEVERE: Error deploying configuration descriptor /software/sirsi/tomcat_sbox7/conf/Catalina/localhost/custom.xml
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/custom]]
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:904)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:618)
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:650)
    at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1582)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    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)

【问题讨论】：

离题；属于服务器故障。

标签： java unix tomcat tomcat7

【解决方案1】：

jar 文件需要在类路径中（不在 CATALINA_HOME 中）。

【讨论】：

在我的应用程序 (CATALINA_BASE) 的 catalina.properties 文件中，我有 common.loader=${catalina.home}/lib/*.jar 似乎可以在 CATALINA_HOME 中找到所有其他 jar。这解决了我之前遇到的一个问题，即 tomcat 找不到 Catalina 类。
我的回答是错误的 - JarScanner 是 Tomcat 的一部分。 Tomcat 的根目录中有 JarScanner.jar 文件吗？你把它移到那里了吗？
不，我发现 JarScanner 类是 lib 目录中的 tomcat-api.jar 的一部分。我还在同一日志的开头发现了这一点，该日志给出了错误：[Loaded org.apache.tomcat.JarScanner from file:/usr/local/apache-tomcat-7.0.30/lib/tomcat-api.jar]
“我有 common.loader=${catalina.home}/lib/*.jar 似乎可以在 CATALINA_HOME 中找到所有其他 jar” - 你的意思是在 CATALINA_HOME/lib 中吗？
你应该有这样的东西：common.loader=${catalina.home}/lib,${catalina.home}/lib/*.jar in conf/catalina.properties。我不会改变这个（或覆盖它）

【解决方案2】：

按照步骤将您的 jar 放入您的 webapps 文件夹中

1.转到程序文件>Apache Software Foundation>Tomcat > 网络应用程序。

把你的jar放到（你创建的目录）/WEB-INF /lib目录中

然后在 localhost 上运行来执行它。

【讨论】：

这是一个unix系统，也请看下面的答案。