package com.destroystokyo.paperclip;

public class Main {

    public static void main(final String[] args) {
        System.out.println("WARNING: Java 9 currently causes significant issue for a lot of Bukkit plugins due to new ClassLoading semantics.");
        System.out.println("WARNING: For the time being, it is recommended to stick with Java 8 until plugins are updated.");

        Paperclip.run(args);
    }
}

@@ -110,35 +110,35 @@
 %0A        System.
-out
+err
 .println(%22WARNIN
@@ -181,16 +181,17 @@
 nt issue
+s
  for a l
@@ -268,11 +268,11 @@
 tem.
-out
+err
 .pri

Use System.err to more highlight the warning messages