线程"main"中的异常java.lang.NoClassDefFoundError:org/slf4j/ILoggerFactory

Question

我试图在Eclipse项目中使用log4j.2.x进行日志记录.我的名为log4j2.xml的conf文件直接在java项目下,我在classpath中有必要的jar.当我测试时,我看到下面的错误消息.谁能告诉我解决方案呢？log4j2.xml:

<?xml version="1.0" encoding="UTF-8"?> <configuration status="WARN">  <appenders>
<Console name="Console" target="SYSTEM_OUT">
  <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
</Console>  </appenders>  <loggers>
<root level="error">
  <appender-ref ref="Console"/>
</root>  </loggers></configuration>

控制台中的错误:

Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/ILoggerFactory
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
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$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:186)
at org.apache.logging.slf4j.SLF4JLoggerContextFactory.<init>(SLF4JLoggerContextFactory.java:34)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at java.lang.Class.newInstance0(Class.java:372)
at java.lang.Class.newInstance(Class.java:325)
at org.apache.logging.log4j.LogManager.<clinit>(LogManager.java:84)
at Browserbot.<clinit>(Browserbot.java:17)Caused by: java.lang.ClassNotFoundException: org.slf4j.ILoggerFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356) ... 23 more

我的Java文件:

public class Browserbot {
static Logger logger = LogManager.getLogger(Browserbot.class.getName());

public static void main(String[] args){

    logger.error("File Not Found");}}       

Answer 1

slf4j.jar运行程序时,类路径中缺少这些内容.要了解slf4j和log4j之间的依赖关系,要下载jar等,请点击此链接:

http://www.slf4j.org