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I am trying to run the WordCount example on hadoop - 1.0.4 and I am getting the following error:
Exception in thread "main" java.lang.UnsupportedClassVersionError: WordCount : Unsupported major.minor version 52.0 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 java.lang.ClassLoader.loadClass(ClassLoader.java:356) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:264) at org.apache.hadoop.util.RunJar.main(RunJar.java:149) I use the following java version:
java version "1.7.0_11" Java(TM) SE Runtime Environment (build 1.7.0_11-b21) Java HotSpot(TM) Server VM (build 23.6-b04, mixed mode) Also JAVA_HOME indicates to the java7 installation directory.
Thanks for your help.
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UnsupportedClassVersionError happens because of a higher JDK during compile time and lower JDK during runtime. How can i make above change? Project -> Properties -> Java Compiler Enable project specific settings. Then select Compiler Compliance Level to 1.7, 1.6 or 1.5, build and test your app.
Class UnsupportedClassVersionErrorThrown when the Java Virtual Machine attempts to read a class file and determines that the major and minor version numbers in the file are not supported.
The format of the version-string is $MAJOR. $MINOR. $SECURITY. $PATCH . $MAJOR is the version number that is incremented for a major release, for example JDK 9, which contains significant new features as specified by the Java SE platform specification.
1) If you encounter UnSupportedClassVersionError, check the JRE version you are using to run program and switch to higher version for quick solution.
Seems like you are using JDK8 for compiling and Lower version on Where you are using it.
So
Assuming using eclipse, Window > Preferences > Compiler > compiler level
and then set lower level(< current one ).
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