Changes in java code are not reflected

I am trying to modify java code to block muting.
in line

i have changed
boolean handleMuteRequest(Jid fromJid,
Jid toBeMutedJid,
boolean doMute)
{
to

boolean handleMuteRequest(Jid fromJid,
Jid toBeMutedJid,
boolean doMute)
{
return false;

recompiled jar, replaced in my quickinstall ubuntu installation,
but mute remote particiant still works.
why?

i have done full server reboot, also service jicofo restart many times.
removed /usr/share/jicofo
replaced with unzipped snapshot, nothiing…