线程“主”中的异常java.lang.NoClassDefFoundError：com / google / common / base /前提条件 [英] Exception in thread "main" java.lang.NoClassDefFoundError: com/google/common/base/Preconditions

问题描述

在运行java map的同时，减少eclipse中的应用程序，并面对下面的异常。我已经在我的构建路径中包含了commons-logging-1.2.jar文件，但仍然在下面。

While running by java map reduce application in eclipse, and facing the below exception. I have included the commons-logging-1.2.jar file in my build path also, but still below is coming.

我是hadoop的新手。请帮助我。

I am new to hadoop. Kindly help me out.

Exception in thread "main" java.lang.NoClassDefFoundError: com/google/common/base/Preconditions
    at org.apache.hadoop.conf.Configuration$DeprecationDelta.<init>(Configuration.java:314)
    at org.apache.hadoop.conf.Configuration$DeprecationDelta.<init>(Configuration.java:327)
    at org.apache.hadoop.conf.Configuration.<clinit>(Configuration.java:409)
    at AverageNosClass.main(AverageNosClass.java:71)
Caused by: java.lang.ClassNotFoundException: com.google.common.base.Preconditions
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    ... 4 more

推荐答案

确保您已将正确的JAR添加到您的构建路径。

Make sure you have added the correct Jar to your build path..

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