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I get following exception, when I execute hdfs namenode -format command:

Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/hadoop/util/PlatformName : Unsupported major.minor version 51.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: org.apache.hadoop.util.PlatformName.  Program will exit.
Sachin Janani
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HARSH PARMAR
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  • Check below link http://stackoverflow.com/questions/7237536/exception-in-thread-main-java-lang-unsupportedclassversionerror-a-unsupporte Update java alternatives – BruceWayne Dec 28 '15 at 11:45
  • @Krishna can you help me in finding the hadoop eclipse plugin for hadoop version 2.7.1 – HARSH PARMAR Dec 28 '15 at 11:52

1 Answers1

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This issue is related to java version mismatch i.e the version with which hadoop is compiled is higher than the jdk version installed on your machine.Install proper jdk version and set JAVA_HOME properly

Sachin Janani
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  • server ipc version 9 cannot communicate with client version 3, I am getting this error in DFS path when i connect in eclipse. hadoop version I m using is 2.7.1 and eclipse hadoop plugin I have added is of 0.20.2, why is that error? – HARSH PARMAR Dec 28 '15 at 11:49