[itcry]

Для теста добавил в loginserver_loop.sh set PATH=/usr/lib/jvm/jdk1.7.0/

# !/bin/bash
set PATH=/usr/lib/jvm/jdk1.7.0/
err=1
until [ $err == 0 ];
do
	. ./setenv.sh
	[ -f log/java0.log.0 ] && mv log/java0.log.0 "log/`date +%Y-%m-%d_%H-%M-%S`_java.log"
	[ -f log/stdout.log ] && mv log/stdout.log "log/`date +%Y-%m-%d_%H-%M-%S`_stdout.log"
	java -Dfile.encoding=UTF-8 -Xmx64m -XX:+UseConcMarkSweepGC net.l2emuproject.loginserver.L2LoginServer > log/stdout.log 2>&1
	err=$?
#	/etc/init.d/mysql restart
	sleep 10;
done

Результат тот же:

Exception in thread "main" java.lang.UnsupportedClassVersionError: net/l2emuproject/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: net.l2emuproject.loginserver.L2LoginServer.  Program will exit.