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找不到类定义错误：org/slf4j/Logger

javalogginglog4jslf4jlog4j2
12

我将Log4J2添加到了我的应用程序中。我将所有的Log4J2 .jar文件复制到了我的LIB目录下，并创建了支持它的Log4J2.xml文件。我的代码已更新以导入必要的日志管理器和日志记录器API。然后，我添加了静态最终的logger方法并在我的代码中调用了logger API。在Eclipse中一切都编译成功。我继续在我的DEV机器上启动我的服务器以进行验证。在启动服务器时，我收到了以下错误：

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)`

我的配置有什么问题？我需要下载另一个.JAR文件吗，还是这是一个配置问题？

谢谢， Stephen。

我将slf4j .jars复制到我的lib目录下，然后重新启动了服务器。现在出现了以下错误。有什么想法为什么会抛出这些错误？

.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)
现在你的SLF4J配置中存在循环依赖... - Thorbjørn Ravn Andersen
3个回答
22
答案隐藏在手册页中：

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），因为这会导致事件不断在SLF4J和Log4j 2之间循环路由。

您需要保留log4j-slf4j-impl-2.xx.jar并删除log4j-to-slf4j-2.xx.jar。
1
我从Apache中提取了Log4j的zip文件，它们都在同一个文件夹里...当然这肯定会出问题。;)感谢您帮我节省大量时间和挫折。 - FDM
1
我添加了这些文件，现在启动服务器时出现了一个新的错误。有什么想法是什么原因引起的吗？ - Stephen McKain
1
一段代码出现 NoClassDefFoundError 和 ClassNotFoundException 时，说明在运行时缺少了特定的类。
您需要在类路径中提供各种 SLF4J 实现的 .jar 文件之一。
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