NoClassDefFoundError：org/slf4j/Logger

我将Log4J2添加到了我的应用程序中。我将所有的Log4J2 .jar文件复制到LIB目录，并创建了Log4J2.xml文件来支持它。我的代码已更新，以导入必要的日志管理器和记录器API。然后我添加了静态最终记录器方法，并在我的代码中调用记录器apis。 Eclipse中的所有编译文件。我继续在我的DEV机器上启动我的服务器来验证它。在启动我的服务器时，我收到以下错误：'NoClassDefFoundError：org/slf4j/Logger

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)`

我的配置有什么问题？我是否需要下载另一个.JAR或者这是一个配置问题？

谢谢， Stephen。

我将slf4j .jars复制到我的lib并重新连接服务器。出现以下错误。任何想法为什么这些错误现在被抛出？

.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)

来源

2014-10-20 Stephen McKain

现在你在SLF4J配置中有一个循环依赖关系... – 2014-10-20 06:56:20

答案就隐藏在manual页面提供各种SLF4J实施的一个.jar文件：

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.

你想保持 log4j的，SLF4J -impl-2.xx.jar和删除 log4j-to-slf4j-2.xx.jar。

来源

2014-10-20 08:16:25

我从Apache提取了Log4j压缩文件，两者都在文件夹中......当然这肯定会出错。 ;）谢谢你为我节省了大量的时间和挫折。 – FDM 2016-02-05 11:14:53

是的。你需要SLF4J jar文件。您可以通过以下网址下载：http://www.slf4j.org/download.html

来源

2014-10-20 05:00:42 triggerNZ

我添加了这些文件，现在在启动服务器时收到一个新错误。任何想法可能导致它？ – 2014-10-20 05:39:39

什么是错误？也许更新这个问题？ – triggerNZ 2014-10-20 06:06:34

A NoClassDefFoundError与ClassNotFoundException指定特定类在运行时缺失。

你必须在classpath

来源

2014-10-20 05:07:57

NoClassDefFoundError：org/slf4j/Logger

回答

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