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NoClassDefFoundError：org / slf4j / Logger

[英]NoClassDefFoundError: org/slf4j/Logger

 原文  2014-10-20 04:58:44  1   3    java/ logging/ log4j/ slf4j/ log4j2

问题描述

I added Log4J2 to my application. 我将Log4J2添加到了我的应用程序中。 I copied all the Log4J2 .jar files to by LIB directory and created the Log4J2.xml file to support it. 我将所有Log4J2 .jar文件复制到LIB目录并创建了Log4J2.xml文件以支持它。 My code was updated to import the necessary Log Manager and Logger APIs. 我的代码已更新，以导入必要的Log Manager和Logger API。 I then added the static final logger method and called the logger apis in my code. 然后我添加了静态最终记录器方法，并在我的代码中调用了logger apis。 Everything compiled file in Eclipse. Eclipse中的所有编译文件。 I proceed to start my server on my DEV machine to validate it. 我继续在我的DEV机器上启动我的服务器来验证它。 Upon starting my server I received the following error:` 启动我的服务器后，我收到以下错误：` 

2014-10-19 21:39:31.753:INFO:oejs.Server:jetty-8.1.14.v20131031
2014-10-19 21:39:32.680:WARN:oejuc.AbstractLifeCycle:FAILED FoundationStartup: java.lang.NoClassDefFoundError: org/slf4j/Logger
java.lang.NoClassDefFoundError: org/slf4j/Logger
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:41)
    at org.apache.logging.log4j.LogManager.getLogger(LogManager.java:474)
    at com.global.service.FoundationStartup.<clinit>(FoundationStartup.java:19)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at java.lang.Class.newInstance0(Unknown Source)
    at java.lang.Class.newInstance(Unknown Source)
    at org.eclipse.jetty.servlet.ServletContextHandler$Context.createServlet(ServletContextHandler.java:1075)
    at org.eclipse.jetty.servlet.ServletHolder.newInstance(ServletHolder.java:957)
    at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:514)
    at org.eclipse.jetty.servlet.ServletHolder.doStart(ServletHolder.java:344)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:791)
    at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:265)
    at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1221)
    at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:717)
    at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:454)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:229)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95)
    at org.eclipse.jetty.server.Server.doStart(Server.java:282)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.wst.server.preview.internal.PreviewStarter.run(PreviewStarter.java:72)
    at org.eclipse.wst.server.preview.internal.PreviewStarter.main(PreviewStarter.java:29)
Caused by: 
java.lang.ClassNotFoundException: org.slf4j.Logger
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:424)
    at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:377)
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:41)
    at org.apache.logging.log4j.LogManager.getLogger(LogManager.java:474)
    at com.global.service.FoundationStartup.<clinit>(FoundationStartup.java:19)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at java.lang.Class.newInstance0(Unknown Source)
    at java.lang.Class.newInstance(Unknown Source)
    at org.eclipse.jetty.servlet.ServletContextHandler$Context.createServlet(ServletContextHandler.java:1075)
    at org.eclipse.jetty.servlet.ServletHolder.newInstance(ServletHolder.java:957)
    at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:514)
    at org.eclipse.jetty.servlet.ServletHolder.doStart(ServletHolder.java:344)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:791)
    at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:265)
    at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1221)
    at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:717)
    at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:454)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:229)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95)
    at org.eclipse.jetty.server.Server.doStart(Server.java:282)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.wst.server.preview.internal.PreviewStarter.run(PreviewStarter.java:72)
    at org.eclipse.wst.server.preview.internal.PreviewStarter.main(PreviewStarter.java:29)`

What is wrong with my configuration? 我的配置有什么问题？ Do I need to download another .JAR or is this a configuration problem? 我是否需要下载另一个.JAR或这是配置问题？

Thanks, Stephen. 谢谢，斯蒂芬。

I copied the slf4j .jars to my lib and reran the server. 我将slf4j .jars复制到我的lib并重新启动服务器。 The following errors appeared. 出现以下错误。 Any ideas why these errors are being thrown now? 有什么想法为什么现在抛出这些错误？ 

.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:41)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:51)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:277)
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:41)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:51)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:277)
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:41)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:51)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:277)
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:41)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:51)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:277)
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:41)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:51)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:277)
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:41)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:51)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:277)
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:41)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:51)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:277)
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:41)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:51)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:277)
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:41)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:51)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:277)
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:41)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:51)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:277)
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:41)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:51)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:277)
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:41)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:51)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:277)
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:41)

3 个解决方案

解决方案1
 18 已采纳  2014-10-20 08:16:25

The answer is hidden in the manual page: 答案隐藏在手册页中：

Use of the Log4j 2 SLF4J Binding (log4j-slf4j-impl-2.0.jar) together with the SLF4J adapter (log4j-to-slf4j-2.0.jar) should never be attempted, as it will cause events to endlessly be routed between SLF4J and Log4j 2. 永远不要尝试使用Log4j 2 SLF4J绑定（log4j-slf4j-impl-2.0.jar）和SLF4J适配器（log4j-to-slf4j-2.0.jar），因为它会导致事件无休止地在SLF4J之间路由和Log4j 2。

You want to keep the log4j-slf4j-impl-2.xx.jar and remove the log4j-to-slf4j-2.xx.jar. 您希望保留 log4j-slf4j-impl-2.xx.jar并删除 log4j-to-slf4j-2.xx.jar。

解决方案2
 1  2014-10-20 05:00:42

Yes. 是。 you need the SLF4J jar file. 你需要SLF4J jar文件。 You can download it at: http://www.slf4j.org/download.html 您可以在http://www.slf4j.org/download.html下载它

解决方案3
 0  2014-10-20 05:07:57

A NoClassDefFoundError with ClassNotFoundException specifies that the particular class is missing during runtime. 带有ClassNotFoundException的NoClassDefFoundError指定在运行时期间缺少特定的类。

You have to provide one of the various SLF4J implementation .jar files in the classpath 您必须在类路径中提供各种SLF4J实现.jar文件之一

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