i need some noobish help..

im having trouble opening my run.bat from my source... it says error compiler java is higher version but i double checked...its a clean 317 btw

Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: server/Server
has been compiled by a more recent version of the Java Runtime (class file vers
ion 57.0), this version of the Java Runtime only recognizes class file versions
up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
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$100(Unknown Source)
at java.net.URLClassLoader$1.run(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)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unkno wn Source)
Press any key to continue . . .

i have jdk 13.0.2 my compiler is set to that aswell. what else should i be checkin?

Ehm bro, the error exactly tells you what is wrong mate.

server/Server
has been compiled by a more recent version of the Java Runtime (class file vers
ion 57.0), this version of the Java Runtime only recognizes class file versions
up to 52.0


Also do not use run.bat use an IDE to start/stop and programm/compile the server.

you need to install a newer version of java to run it, look up the java major versions

just to add you can just recompile the files providing they're not using anything in a later jdk, just make sure you delete the old bin / build directory otherwise it might get confused.

you should switch though because jdk13 isn't maintained anymore

Download Java 8