Xueming Shen a écrit :
[...]
Two use scenarios
(1) jvm is being terminated "abnormally" during a password reading
operation (during "normal" application
operation), in which the echo is in "off" mode when these shutdown
hooks start to be invoked. Without
the "console restore first", application hooks probably can do nothing
with the stdin/console
(2)Application hooks use Console.readPassword() and then be terminated
"abnormally" during the reading,
in which the echo mode is kept in "off" mode and will not be restored
after app exits.
The reason the console hook was/is added to run first is we weighed
the first scenario as a more likely
scenario in real world application. Note, the Console echo mode is not
required to be "restored" if the
reading operation finishes normally.
Maybe we can consider to run the console hook again (if the hook is
set) after the application hooks?
Sherman
The other solution is to provide a way in the API to test if shutdown hooks
have been started or not.
In that case, all application codes that start a shutdown hook like
Console.readPassword()
can check if shudown hooks run or not and throw a runtime exception
if shutdown hook run.
Rémi
