JAVA Unsupported major minor version 51 0

Question

I m not a programmer but I couldn t find any answer on this website  I m trying to run a game on linux ubuntu with Java Open JDK but nothing happen  I tried to run it with the prompt command and it said this   leops95 leops95-SATELLITE-C660      home leops95 Bureau Minecraft jar   Exception in thread  main  java lang UnsupportedClassVersionError  net kc main Main     Unsupported major minor version 51 0     at java lang ClassLoader defineClass1 Native Method      at java lang ClassLoader defineClass ClassLoader java 634      at java security SecureClassLoader defineClass SecureClassLoader java 142      at java net URLClassLoader defineClass URLClassLoader java 277      at java net URLClassLoader access 000 URLClassLoader java 73      at java net URLClassLoader 1 run URLClassLoader java 212      at java security AccessController doPrivileged Native Method      at java net URLClassLoader findClass URLClassLoader java 205      at java lang ClassLoader loadClass ClassLoader java 321      at sun misc Launcher AppClassLoader loadClass Launcher java 294      at java lang ClassLoader loadClass ClassLoader java 266    Could not find the main class  net kc main Main  Program will exit   I think there is something wrong with the version of Java  right

User · Answer

The Java runtime you try to execute your program with is an earlier version than Java 7 which was the target you compile your program for.

For Ubuntu use

apt-get install openjdk-7-jdk

to get Java 7 as default. You may have to uninstall openjdk-6 first.

User · Answer

This is because of a higher JDK during compile time and lower JDK during runtime  So you just need to update your JDK version  possible to JDK 7  You may also check Unsupported major minor version 51 0

[java] JAVA Unsupported major.minor version 51.0

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