Spigot or CraftBukkit cannot be launched using Java 13. When trying to do so an error message appears stating "Unsupported Java detected (57.0). Only up to Java 12 is supported.". I'm uncertain if Spigot/CraftBukkit don't work on this version, however, if not, it would be appreciated if this can be altered in such a way that it does allow the server to be run using Java 13.

To reproduce this error, make sure you have Java 13 installed on the PC these reproduction steps will be executed on. Java 13 can be downloaded from: http://jdk.java.net/13/.

• Verify that Java is currently pointing to version 13. This can be done by opening a terminal and typing java -version and observing the output shown. If this is not pointing to Java 13, you can change this by specifying the fully qualified path to the java.exe file in the JDK's bin folder, instead of just java when executing the command from the command line. Alternatively, on Windows devices, you can go into the Environment variables (click Start button -> Control Panel -> System -> Advanced System Settings -> Advanced -> Environment Variables) and alter the PATH variable to point to the Java 13 bin.
• Try running the server using java -jar <serverfile> where <serverfile> is the path to the server JAR file. The output specified earlier should now be shown.

This bug affects Spigot 1.14.4, Spigot 1.13.2, CraftBukkit 1.14.4 and CraftBukkit 1.13.2. This does not affect Vanilla 1.14.4 and Vanilla 1.13.2.