Re: Obtain process ID of DefaultExecutor process

On Sat, Feb 21, 2026 at 9:12=E2=80=AFAM Tenenbaum, Peter G. (ARC-TN)[SETI
INSTITUTE] via user <[email protected]> wrote:
>
> Hi there =E2=80=94
>
> I was looking for a way to get the process ID of a process that gets star=
ted by the DefaultExecutor. From looking at the javadoc, there=E2=80=99s no=
 built-in way to do it.
>
> Google recommends that I create a subclass of DefaultExecutor that overri=
des the launch() method, such that the Process it returns is interrogated f=
or the PID. DefaultExecutor isn=E2=80=99t final and launch() is protected, =
so in principle this can be done.
>
> However:
>
> The only public constructor for DefaultExecutor is deprecated. The non-de=
precated method to instantiate a DefaultExecutor is to use the DefaultExecu=
tor builder, but AFAICT there=E2=80=99s no way to get this builder to retur=
n a DefaultExecutor subclass. I could subclass the DefaultExecutor builder,=
 but the DefaultExecutor builder uses a package-private DefaultExecutor con=
structor, so my subclass of DefaultExecutor builder can=E2=80=99t use that =
constructor.
>
> In a pinch, I could imagine giving my subclass its own constructor that e=
mulates the package-private one in DefaultExecutor. Unfortunately, this als=
o won=E2=80=99t work: all the instance variables are private and there are =
no protected setters for them.
>
> It seems like the intent is there to allow users to subclass DefaultExecu=
tor, but in practice the only way to do it appears to be the deprecated pub=
lic constructor. Am I missing something?
>
> Is there an easier way to get the PID from a DefaultExecutor?

Hello PT,

Have you tried registering an ExecuteWatchdog with a DefaultExecutor?
It accepts a Process that you can query.

Gary

>
> Thanks,
> -PT