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Re: Groff hanging when called from Java

From: John Gardner
Subject: Re: Groff hanging when called from Java
Date: Sat, 18 Dec 2021 01:18:57 +1100

Are you sure the process isn't waiting for input from an interactive
(TTY-attached) STDIN stream?

Try sending ^D (CTRL+D), which should tell it that it's reached EOF. I
don't know much about Java, only that it's weird and gross (so I have to
assume writing to /dev/stderr or even /dev/console doesn't work as

On Sat, 18 Dec 2021, 1:10 am Blake McBride, <> wrote:

> Greetings,
> I have been calling groff from java for a long time.  Works well.  However,
> recently I passed an errant file to groff through java and the process is
> hanging.  When run from the command line it works as expected.  But when I
> run it through java it hangs.  I'm at a loss.  Any help would sure be
> appreciated.
> The Java code (
> public class Main {
>     public static void main(String [] argv) throws Exception {
>         ProcessBuilder builder = new ProcessBuilder("groff", "-mm", "-t",
> "-Tpdf", "");
>         Process p = builder.start();
>         p.waitFor();
>         System.out.println("Done.");
>     }
> }
> It hangs on the p.waitFor().  If I do a "ps lax |grep groff" I see groff is
> still running (hung).
> I am attaching  I know it is wrong, but it shouldn't cause a hang.
> Sure appreciate any help!
> Blake McBride

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