LTTng

What do you mean by "while having events that are disabled"? I tried disabling events in advance and it doesn't seem to work:

$ lttng create
Session auto-20160706-161639 created.
Traces will be written in /home/alexandre/lttng-traces/auto-20160706-161639
$ lttng disable-event -u myevent
Error: myevent of type any : No channel found in the session (channel channel0, session auto-20160706-161639)
$ lttng enable-channel -u mychannel
UST channel mychannel enabled for session auto-20160706-161639
$ lttng disable-event -u myevent -c mychannel
Error: myevent of type any : UST event not found (channel mychannel, session auto-20160706-161639)

and with the JUL domain you cannot even create channels:

$ lttng create
Session auto-20160706-161711 created.
Traces will be written in /home/alexandre/lttng-traces/auto-20160706-161711
$ lttng disable-event -j myevent
Error: myevent of type any : No channel found in the session (channel channel0, session auto-20160706-161711)
$ lttng enable-channel -j mychannel
Error: Undefined command or invalid arguments

This is with LTTng master.

From what I recall:

lttng create
lttng enable-event -u test
lttng disable-event -u test
lttng enable-event -u -a

lttng enable-event -j test
lttng disable-event -j test
lttng enable-event -j -a

Cheers

Here are the commands I did (those are with version 2.7.2, but I tried with 2.8.0 and master):
$ lttng create jul
Session jul created.
Traces will be written in /home/bruno/lttng-traces/jul-20160706-163027
$ lttng enable-event foo -j
JUL event foo enabled
$ lttng disable-event foo -j
JUL foo of type any disabled in channel channel0 for session jul
$ lttng list jul
(...)
Events (Logger name):
---------------------
- foo [disabled] [filter: 'logger_name "foo"']
$ lttng enable-event -aj
All JUL events are enabled in channel channel0
$ lttng list jul
(...)
Events (Logger name):
---------------------
- foo [enabled] [filter: 'logger_name "foo"']
- * [enabled]

In the end result, the logger foo is enabled. I'm not sure this is a bug, but the behaviour is different in UST, for the same scenario (the single event is still disabled).