How to recompile blynk Server?

I have Decompiled the blynk Server.jar. Which program do I have to use to recompile it?

What now? You have decompressed the .jar-file…?

What are you trying to do exactly? And has it something to do with your other post about compiling?

I had decompiled the .jar of the server to make some edits into it and run it. I had not downloaded the source because I didn’t know that I could compile it with maven. So I had decompiled the .jar but was unable to recompile it. Now all those problems have been solved. Thank you very much for your time