L2J Server

i use debian dedicate server and i get error when i try run server

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/l2jserver/loginserver/L2LoginServer : 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: com.l2jserver.loginserver.L2LoginServer. Program will exit.

EDIT:
In Windows everything work perfect
I found some themes what i need java 7 but i dont found any lesson how install java 7 to debian dedicate server

Please help

Try this: http://openjdk.java.net/install/

i try that its doesnt work
If i write Everything work perfect but if try update java 7 i get error

lol guys...

don't install software from linux repos!, because most of the times these repos are outdated and with outdated software too.

better way is download Java from oficial website.

also this topic was answered many times, so closed.