Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/yarn/util/Apps Hadoop2.6.0编程问题与解决

从hadoop 1.2.1升级到 Hadoop2.6.0，调试写代码，还是遇到一些问题的。这里记录一下，后续如果自己再遇到类似问题，那也好找原因了。

在eclipse里编译运行 WordCount，出现以下错误。

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/yarn/util/Apps

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 sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)

at java.lang.ClassLoader.loadClass(ClassLoader.java:358)

at org.apache.hadoop.mapred.LocalDistributedCacheManager.setup(LocalDistributedCacheManager.java:93)

at org.apache.hadoop.mapred.LocalJobRunner$Job.<init>(LocalJobRunner.java:163)

at org.apache.hadoop.mapred.LocalJobRunner.submitJob(LocalJobRunner.java:731)

at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:536)

at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1296)

at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1293)

at java.security.AccessController.doPrivileged(Native Method)

at javax.security.auth.Subject.doAs(Subject.java:415)

at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)

at org.apache.hadoop.mapreduce.Job.submit(Job.java:1293)

at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1314)

at WordCount.main(WordCount.java:70)

Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.yarn.util.Apps

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)

... 24 more

经过查找类似的错误，终于找到了解决方法。

添加Yarn目录下的Jar包即可。我是把所有包都添加上了。

总结：1、凡是出现 classNotFound、NoClassDefFoundError之类的错误异常，多是jar包未导入引起的。根据相应提示找相应目录下的jar包即可。

2、出现异常，直接粘贴到网上找异常解决，有时候不如自己思考着去解决好使。网上相类似的太多，不一定能准确定位找到解决方法。仔细看下异常描述，稍加分析，尝试自己去思考解决方法，也许会更有效。当然，前提是已经有一定的异常处理解决的经验基础。

时间： 2025-01-01 15:10:05

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/yarn/util/Apps Hadoop2.6.0编程问题与解决的相关文章

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