"Hadoop" 12, when running Hadoop error

Exception in thread "main" java.lang.unsupportedclassversionerror:com/cutter_point/mr/jobrun:unsupported Major.minor version 52.0

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 java.lang.ClassLoader.loadClass(ClassLoader.java:358)at java.lang.Class.forName0(Native Method)at java.lang.Class.forName(Class.java:274)at org.apache.hadoop.util.RunJar.main(RunJar.java:153)

The cause of this error is the version issue

java.lang.unsupportedclassversionerror:pr/sort:unsupported Major.minor version 52.0 This error is due to the high-level Java Project uses a lower version to run.

I showed up in this situation when I replaced the JVM8 in Java build path–>libraries in the properties JVM7

And then the operation was an error.

Workaround:
The Compiler compliance level in Properties–>java compiler-is changed from 1.8 to 1.7, and then it can be run .

Http://blog.sina.com.cn/s/blog_64ecfc2f0102uxu6.html

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"Hadoop" 12, when running Hadoop error