need help for public server! rotmg

im talking about this thread
http://www.mpgh.net/forum/599-realm-...erver-jar.html

when i ran the
server.bat file i got this error first
Java Is Not Recognized As An Internal Or External Command
but i mangaed to fix it by watching this youtube video


but now i have this error


C:\Users\Owner\Desktop\New folder\server>java -jar server.jar
Exception in thread "main" java.lang.UnsupportedClassVersionError: server/ROTMGS
erver : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknow n Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: server****TMGServer. Program will exit.

C:\Users\Owner\Desktop\New folder\server>pause
Press any key to continue . . .

well i have no experience with this stuff other than being able to type in the problem into google lol
i have no idea what to do
any help would be great


UPDATE!!!
I had already updated to java 7
but i looked in my programs and had both java 6 & 7 :O
uninstalled windows 6
still didnt work
looked around and saw i had java 7 32 bit so i uninstalled it and got java 7 64 bit
(dont know if 32 or 64 makes a diffrence but it worked for me)
http://www.java.com/en/download/manual.jsp
now i get this

C:\Users\Owner\Desktop\New folder\server>java -jar server.jar
Policy server started.
Loaded map.
ROTMGServer started.

works!
except when i start the client and click play i get this


C:\Users\Owner\Desktop\New folder\server>java -jar server.jar
Policy server started.
Loaded map.
ROTMGServer started.
Init
Init
HELLO [123.5.1 , -1 , fC95qH3yY9ju7SouRZz2lfiGvr4GF6FBx/D1dzy9reeGOTEFSnyyv5su1P
AnoARmZ7dQMyzmXPQk+D4bLP5GPdkpdpjNNIbaz3Tfp22LVQBy LXfPwbUbNPJiPZLJyJiQ2FKrc4unVZ
IIy0hVa08rog2zCklROhgAN9qKAJtB75U= , , , -1 , , , , rotmg , , rotmg]
java.net.SocketException: socket closed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java****.DataInputStream.readInt(Unknown Source)
at server.ClientHandler.readPacket(ClientHandler.java :267)
at server.ClientHandler$1.run(ClientHandler.java:86)
Exception in thread "Thread-4" java.lang.NullPointerException
at server.Map.disconnect(Map.java:281)
at server.ClientHandler.disconnect(ClientHandler.java :350)
at server.ClientHandler$1.run(ClientHandler.java:95)
HELLO [123.5.1 , -1 , OhiuBMCQtPyCrOXMP4arfZ7jlpU/VssqVMKv8jUrwXS4zPaH1F5TGNMV11
gMbS1CZvxMv9PpQbpFS/HCBanz/okbN/cUaA15X0uAylGtxD5LEtxgW9wKsr0uYUbXIgODDEdHzvz6wq
CDj+zugb+yf0NnAscBj5elJujzP3L9DgA= , , , -1 , , , , rotmg , , rotmg]
java.net.SocketException: socket closed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java****.DataInputStream.readInt(Unknown Source)
at server.ClientHandler.readPacket(ClientHandler.java :267)
at server.ClientHandler$1.run(ClientHandler.java:86)
Exception in thread "Thread-7" java.lang.NullPointerException
at server.Map.disconnect(Map.java:281)
at server.ClientHandler.disconnect(ClientHandler.java :350)
at server.ClientHandler$1.run(ClientHandler.java:95)

(it keeps on going as long as im trying to connect on realm)

I sometimes also get


C:\Users\Owner\Desktop\New folder\server>java -jar server.jar
Policy server started.
Loaded map.
ROTMGServer started.
Exception in thread "Thread-4" java.lang.OutOfMemoryError: Java heap space
at server.ClientHandler.readPacket(ClientHandler.java :269)
at server.ClientHandler$1.run(ClientHandler.java:86)
Exception in thread "Thread-8" java.lang.OutOfMemoryError: Java heap space
at server.ClientHandler.readPacket(ClientHandler.java :269)
at server.ClientHandler$1.run(ClientHandler.java:86)
Exception in thread "Thread-12" java.lang.OutOfMemoryError: Java heap space
at server.ClientHandler.readPacket(ClientHandler.java :269)
at server.ClientHandler$1.run(ClientHandler.java:86)
Exception in thread "Thread-16" java.lang.OutOfMemoryError: Java heap space
at server.ClientHandler.readPacket(ClientHandler.java :269)
at server.ClientHandler$1.run(ClientHandler.java:86)
Exception in thread "Thread-20" java.lang.OutOfMemoryError: Java heap space
Exception in thread "Thread-24" java.lang.OutOfMemoryError: Java heap space
Exception in thread "Thread-28" java.lang.OutOfMemoryError: Java heap space




I dont know what to do now D:

update your java to java 7

Right click server.bat ---> Editing ---> delete "Pause" ---> Save

No Problem