try this
or thisCode:"C:\Program Files (x86)\Java\jdk1.8.0_121\bin\javac.exe" -d bin -cp lib/*;src src\com\ruseps\GameServer.java pause
or if the location path you have written is correct you have a space after javac.exe " it needs to be javac.exe"Code:"C:\Program Files\Java\jdk1.8.0_121\bin\javac.exe" -d bin -cp lib/*;src src\com\ruseps\GameServer.java pause
If this is not your solution then please take a screenshot of what is displayed on your CMD
Thanks.