Exception in thread "main" java.lang.UnsupportedClassVersionError: net/minecraft/server/MinecraftServer : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:648)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:272)
at java.net.URLClassLoader.access$000(URLClassLoader.java:68)
at java.net.URLClassLoader$1.run(URLClassLoader.java:207)
at java.net.URLClassLoader$1.run(URLClassLoader.java:201)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:200)
at java.lang.ClassLoader.loadClass(ClassLoader.java:325)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:296)
at java.lang.ClassLoader.loadClass(ClassLoader.java:270)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:406)
Checked Minecraft Versions
java version "1.6.0_41"
OpenJDK Runtime Environment (IcedTea6 1.13.13) (rhel-1.13.13.1.el7_3-x86_64)
OpenJDK 64-Bit Server VM (build 23.41-b41, mixed mode)
Centos 7
I don't know what to do