I installed Multicraft on my V Server yesterday and now I wanted to install a server. But then only this error message came up:
03.01 10:52:26 [Multicraft] Received start command
03.01 10:52:26 [Multicraft] Loading server properties
03.01 10:52:26 [Multicraft] Starting server!
03.01 10:52:26 [Multicraft] Loaded config for "Default Minecraft Server"
03.01 10:52:26 [Server] INFO Exception in thread "main" java.lang.UnsupportedClassVersionError: net / minecraftforge / fml / relauncher / ServerLaunchWrapper: Unsupported major.minor version 52.0
03.01 10:52:26 [Server] INFO at java.lang.ClassLoader.defineClass1 (Native Method)
03.01 10:52:26 [Server] INFO at java.lang.ClassLoader.defineClass (ClassLoader.java:808)
03.01 10:52:26 [Server] INFO at java.security.SecureClassLoader.defineClass (SecureClassLoader.java:142)
03.01 10:52:26 [Server] INFO at java.net.URLClassLoader.defineClass (URLClassLoader.java:443)
03.01 10:52:26 [Server] INFO at java.net.URLClassLoader.access $ 100 (URLClassLoader.java:65)
03.01 10:52:26 [Server] INFO at java.net.URLClassLoader $ 1.run (URLClassLoader.java:355)
03.01 10:52:26 [Server] INFO at java.net.URLClassLoader $ 1.run (URLClassLoader.java:349)
03.01 10:52:26 [Server] INFO at java.security.AccessController.doPrivileged (Native Method)
03.01 10:52:26 [Server] INFO at java.net.URLClassLoader.findClass (URLClassLoader.java:348)
03.01 10:52:26 [Server] INFO at java.lang.ClassLoader.loadClass (ClassLoader.java:430)
03.01 10:52:26 [Server] INFO at sun.misc.Launcher $ AppClassLoader.loadClass (Launcher.java:326)
03.01 10:52:26 [Server] INFO at java.lang.ClassLoader.loadClass (ClassLoader.java:363)
03.01 10:52:26 [Server] INFO at sun.launcher.LauncherHelper.checkAndLoadMain (LauncherHelper.java:482)
03.01 10:52:26 [Multicraft] Server shut down (starting)
03.01 10:52:26 [Multicraft] Restarting crashed server in 5 seconds
03.01 10:52:26 [Multicraft] Stopping server!
03.01 10:52:28 [Multicraft] Looks like a crash, check the server console. Return value: 1
03.01 10:52:28 [Multicraft] Server stopped
What do I have to do so that I can start the server? I want to install Forge 1.12.2 on it.
Moin and Happy New Year,
why don't you read multicraft's installation instructions and setup procedures? Everything is described there and if it is not there, there's support that speaks German and answers relatively quickly.
Expecting help in such a special case is wasted time. The explanation of what you have to do is too extensive and well explained in the DOKU.
If you're using Java 8, try updating to OpenJDK 11 this time.
If Java 11 is in use, the other way could be Java 8.
The error message indicates that an error has occurred with Java version 52.
Java SE 14 = 58
Java SE 13 = 57
Java SE 12 = 56
Java SE 11 = 55
Java SE 10 = 54
Java SE 9 = 53
Java SE 8 = 52
Java SE 7 = 51
Java SE 6.0 = 50
Java SE 5.0 = 49
JDK 1.4 = 48
JDK 1.3 = 47
JDK 1.2 = 46
JDK 1.1 = 45
Have you ever tried to read and understand the issue?
03.01 10:52:26 [Server] INFO Exception in thread "main" java.lang.UnsupportedClassVersionError: net / minecraftforge / fml / relauncher / ServerLaunchWrapper: Unsupported major.minor version 52.0
So have you ever tried to use a supported Java version?
03.01 10:52:28 [Multicraft] Looks like a crash, check the server console. Return value: 1
Have you followed the hint?
