If in the parameter "executable" is "java -Xmx4096M -cp Launcher.jar:Forge.jar net.minecraftforge.fml.relauncher.ServerLaunchWrapper", then an error "CHECK: FATAL: Executable was not found: /home/*****/serverfiles/forge.jar net.minecraftforge.fml.relauncher.ServerLaunchWrapper". It searches for a file, not a class in a file. And this is a bug.
If in the parameter "executable" is "java -Xmx4096M -cp Launcher.jar:Forge.jar net.minecraftforge.fml.relauncher.ServerLaunchWrapper", then an error "CHECK: FATAL: Executable was not found: /home/*****/serverfiles/forge.jar net.minecraftforge.fml.relauncher.ServerLaunchWrapper". It searches for a file, not a class in a file. And this is a bug.