Optional single application instance enforcement and multiple startup notification

[JosAH]

If only you had explained like this first time.
I'm not sure about this but if you make the program a thread and give it a name and then check against that thread before running the program

That won't work: when you click on a jar another java(w) process is started. Two
different processes can't see each other's threads.

Better just create a simple lock file or have the appliation try to open a socket,
if the file already exists or if the socket is already open another instance is
already running.

kind regards,

Jos

[r035198x]

That won't work: when you click on a jar another java(w) process is started. Two
different processes can't see each other's threads.

Better just create a simple lock file or have the appliation try to open a socket,
if the file already exists or if the socket is already open another instance is
already running.

kind regards,

Jos

About this javaw process, is there a way of distinguishing between two javaw processes started by two different jar files?

[JosAH]

About this javaw process, is there a way of distinguishing between two javaw processes started by two different jar files?

Dunno; using Unix or Linux I can see it in my ps or top list (ordered by age so I
can see which one was started first) but I have no idea how to do that on Windows.

kind regards,

Jos

[r035198x]

Dunno; using Unix or Linux I can see it in my ps or top list (ordered by age so I
can see which one was started first) but I have no idea how to do that on Windows.

kind regards,

Jos

Probably some meddling with task manager ...
The socket approach is the best way here. Or even have the program write/create a file. When another instance starts just check for/in that file.

[JosAH]

Probably some meddling with task manager ...
The socket approach is the best way here. Or even have the program write/create a file. When another instance starts just check for/in that file.

Yup, as I wrote above; I normally use the socket approach but a simple file
(with the pid written in it) does fine too. I don't know how to check if another
pid is still alive on Windows though.

kind regards,

Jos