Error: Unable to initialize main class net.minecraft.server.Main
Caused by: java.lang.NoClassDefFoundError: joptsimple/OptionSpec
I wanted to post this in case anyone else runs into this issue. I tried for three days to try and get my server up and started and nothing would work. I tried uninstalling and reinstalling Java, Minecraft, minecraft launcher, the jar file itself. Non of it worked. The problem was I downloaded the .jar file in the Firefox browser and it came has a .zip file, not just a .jar file. You have to download the .jar file in a different browser.