Tomcat ClassNotFoundException：org.slf4j.spi.LoggerFactoryBinder但是slf4j在libs中 [英] Tomcat ClassNotFoundException: org.slf4j.spi.LoggerFactoryBinder but slf4j is in libs

查看：909
本文介绍了Tomcat ClassNotFoundException：org.slf4j.spi.LoggerFactoryBinder但是slf4j在libs中的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我一直收到以下错误：

Failed to instantiate SLF4J LoggerFactory
Reported exception:
java.lang.NoClassDefFoundError: org/slf4j/spi/LoggerFactoryBinder
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:270)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1562)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1420)
        at org.slf4j.LoggerFactory.bind(LoggerFactory.java:129)
        at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:108)
        at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:302)
        at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:276)
        at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:156)
        at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:132)
        at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:274)
        at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:282)
        at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
        at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4830)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5276)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:726)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:702)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:698)
        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:968)
        at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1742)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.ClassNotFoundException: org.slf4j.spi.LoggerFactoryBinder
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        ... 37 more
21-Jun-2014 17:06:51.352 SEVERE [localhost-startStop-1] org.apache.catalina.core.StandardContext.startInternal Error listenerStart
21-Jun-2014 17:06:51.358 SEVERE [localhost-startStop-1] org.apache.catalina.core.StandardContext.startInternal Context [/spring-app] startup failed due to previous errors
21-Jun-2014 17:06:51.399 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory /media/win/d/coding/servers/tomcat/apache-tomcat-8.0.0-RC5/webapps/docs
21-Jun-2014 17:06:51.829 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory /media/win/d/coding/servers/tomcat/apache-tomcat-8.0.0-RC5/webapps/examples
21-Jun-2014 17:06:53.181 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory /media/win/d/coding/servers/tomcat/apache-tomcat-8.0.0-RC5/webapps/host-manager
21-Jun-2014 17:06:53.575 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory /media/win/d/coding/servers/tomcat/apache-tomcat-8.0.0-RC5/webapps/manager
21-Jun-2014 17:06:53.950 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory /media/win/d/coding/servers/tomcat/apache-tomcat-8.0.0-RC5/webapps/ROOT
21-Jun-2014 17:06:54.324 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-8080"]
21-Jun-2014 17:06:54.328 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-nio-8009"]
21-Jun-2014 17:06:54.329 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 9393 ms
21-Jun-2014 17:07:14.840 INFO [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.startup.HostConfig.undeploy Undeploying context [/spring-app]
21-Jun-2014 17:07:44.907 INFO [localhost-startStop-2] org.apache.catalina.startup.HostConfig.deployWAR Deploying web application archive /media/win/d/coding/servers/tomcat/apache-tomcat-8.0.0-RC5/webapps/spring-app.war
Failed to instantiate SLF4J LoggerFactory
Reported exception:
java.lang.NoClassDefFoundError: org/slf4j/spi/LoggerFactoryBinder
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:270)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1562)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1420)
        at org.slf4j.LoggerFactory.bind(LoggerFactory.java:129)
        at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:108)
        at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:302)
        at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:276)
        at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:156)
        at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:132)
        at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:274)
        at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:282)
        at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
        at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4830)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5276)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:726)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:702)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:698)
        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:968)
        at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1742)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.ClassNotFoundException: org.slf4j.spi.LoggerFactoryBinder
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        ... 37 more

这没有任何意义，因为我 DO web-app / WEB-INF / lib / slf4j-api-1.7中 org.slf4j.spi.LoggerFactoryBinder .6.jar 并且这也在昨天起作用但突然无法启动Web应用程序。

It makes no sense because I DO have org.slf4j.spi.LoggerFactoryBinder in web-app/WEB-INF/lib/slf4j-api-1.7.6.jar and this worked also yesterday but suddenly the web app cannot be started.

导致这种情况的原因是什么？

如何检查/调试一开始Tomcat中Web应用程序的类路径？

What can be causing this?
How can I check/debug the classpath for a web application in Tomcat at the start?

推荐答案

你说slf4j API jar是（是）的一部分Web应用程序。我猜你的slf4j 绑定 jar是安装在Tomcat的 lib 目录中的，或者是某些不是Web应用程序私有的地方。这似乎应该是使用Slf4j的自然方式 - Web应用程序带来了API jar，而tomcat安装提供了正确的绑定。不幸的是，这不起作用。

You say that the slf4j API jar is (was) part of the web application. I'm guessing that your slf4j binding jar is (was) installed in Tomcat's lib directory or some such place where it wasn't private to the web application. This seems like it ought to be a natural way to use Slf4j--the web app brings with it the API jar, and the tomcat installation provides the correct binding. Unfortunately, this doesn't work.

请参阅 Tomcat类加载器操作方法。当以这种方式部署Slf4j时，使用Web应用程序的私有类加载器加载API jar，而使用common类加载器或其他通用类加载器加载绑定jar。 webapp类加载器中的类可以从公共加载器加载类，但是公共加载器中的类不能访问webapp加载器。

Refer to the Tomcat classloader how-to. When Slf4j is deployed in this fashion, the API jar is loaded using the private classloader for the web app, while the binding jar is loaded using the "common" classloader or one of the other general classloaders. Classes in the webapp classloader can load classes from the common loader, but classes in the common loader can't access the webapp loader.

具体来说，当一个类发生异常时在API jar中试图在绑定jar中加载一个类，即 org.slf4j.impl.StaticLoggerBinder 。您在Web应用程序中的代码能够访问API jar，API jar能够在绑定jar中找到此类。但是，StaticLoggingBinder引用了返回API jar中的 org.slf4j.spi.LoggerFactoryBinder 。绑定jar中的类无法访问webapp类加载器，因此它无法加载类并且您获得异常。

Specifically, your exception occurs when a class in the API jar is trying to load a class in the binding jar, namely org.slf4j.impl.StaticLoggerBinder. Your code in the web app is able to access the API jar, and the API jar is able to find this class in the binding jar. But, StaticLoggingBinder references org.slf4j.spi.LoggerFactoryBinder which is back in the API jar. Classes in the binding jar can't access the webapp classloader, so it's not able to load the class and you get the exception.

不幸的是，唯一直接的解决方案是在同一个地方部署Slf4j API和绑定jar。它们都应该是Web应用程序私有类的一部分，或者它们都是常见Tomcat类的一部分。

Unfortunately, the only straightforward solution is to deploy both the Slf4j API and binding jars in the same "place". They should both be part of the web app's private classes, or else both part of the common Tomcat classes.

这篇关于Tomcat ClassNotFoundException：org.slf4j.spi.LoggerFactoryBinder但是slf4j在libs中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

查看全文
相关文章
Java开发最新文章
热门教程
热门工具
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆