You must create and "if" here : http://svn.l2jserver.com/trunk/L2J_Server/java/com/l2jserver/gameserver/network/clientpackets/RequestBypassToServer.java
(check how others are made)
and send the info like "Luck.handleCommand(_command, activeChar);" or whatever
note: better move your java file to core-side to be able to import it, or create a new file inside the core-side and move the handleCommand() thingy there, or put it inside the RequestBypassToServer.java but it would be dirty.