Hadoop“ Word”程序在线程“ main”中的异常java.lang.ClassNotFoundException

Question

I am using eclipse to export the jar file of a map-reduce program. When i am run the jar using command:

hadoop jar Mapreduce.jar Mapreduce siva/file1.txt

Then Show Errors in

Exception in thread "main" java.lang.ClassNotFoundException: Mapreduce
enter code here
at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
at java.net.URLClassLoader$1.run(URLClassLoader.java:201)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:200)
at java.lang.ClassLoader.loadClass(ClassLoader.java:325)
at java.lang.ClassLoader.loadClass(ClassLoader.java:270)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:274)
at org.apache.hadoop.util.RunJar.main(RunJar.java:149)

I could not figure out where is the problem.Please help me

Answer 1

您需要给出完整的类名。我也表示包名，例如，如果我的类名是Mapreduce且包名是com.hadoop.ex，则您的命令应该是hadoop jar MapReduce.jar com.hadoop.ex.MapReduce inputFile输出文件