我将Log4J2添加到我的应用程序中。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。我的代码已更新，以导入必要的Log Manager和Logger 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了logger 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。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)`
我的配置有什么问题？我是否需要下载另一个.JAR或这是配置问题？
谢谢， 斯蒂芬。
我将slf4j .jars复制到我的lib并重新启动服务器。出现以下错误。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)
答案 0 :(得分：18)
答案隐藏在manual页面中：
一起使用Log4j 2 SLF4J绑定（log4j-slf4j-impl-2.0.jar） 使用SLF4J适配器（log4j-to-slf4j-2.0.jar）永远不应该 尝试，因为它将导致事件无休止地在两者之间路由 SLF4J和Log4j 2。
您希望保持 log4j-slf4j-impl-2.xx.jar并删除 log4j-to-slf4j-2.xx.jar。
答案 1 :(得分：1)
是。你需要SLF4J jar文件。您可以在http://www.slf4j.org/download.html
下载答案 2 :(得分：0)
NoClassDefFoundError ClassNotFoundException指定运行时期间缺少特定类。
您必须在类路径
中提供各种SLF4J实现.jar文件之一