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Newsgroups: comp.lang.java.programmer
Date: Fri, 14 Feb 2020 10:53:46 -0800 (PST)
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Subject: Re: running java kills parent shell
From: luserdroog <luser.droog@gmail.com>
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Xref: csiph.com comp.lang.java.programmer:39294

On Wednesday, February 12, 2020 at 6:16:07 AM UTC-6, Martin Gregorie wrote:
> On Tue, 11 Feb 2020 19:57:43 -0800, luserdroog wrote:
>=20
> > I'm using the Java 8 reference implementation. When I run it from
> > cygwin's bash, it runs the program but then it exits the shell. Has
> > anyone encountered this or have any idea how to investigate fixing it?
> > As a workaround, I can spawn a subshell and let that one exit. But I'm
> > not thrilled about having to do this.
>=20
> Command line example?
>=20
> I can see ways of using shell so it would do this, but they aren't ways=
=20
> that I'd normally use it.
>=20

I've done a little more investigating. Everything's fine if the program
just does output. eg.

=1B]0;~/cs4500/hw2=07
luser@LAPTOP-K627HB8A ~/cs4500/hw2
$ cat HelloWorld.java=20
public class HelloWorld {

    public static void main(String[] args) {
        System.out.println("Hello, World");
    }

}
=1B]0;~/cs4500/hw2=07
luser@LAPTOP-K627HB8A ~/cs4500/hw2
$ javac HelloWorld.java=20
=1B]0;~/cs4500/hw2=07
luser@LAPTOP-K627HB8A ~/cs4500/hw2
$ java HelloWorld
Hello, World
=1B]0;~/cs4500/hw2=07
luser@LAPTOP-K627HB8A ~/cs4500/hw2
$


But if I use the scanner, then it starts gorping. eg.

=1B]0;~/cs4500/hw2=07
luser@LAPTOP-K627HB8A ~/cs4500/hw2
$ cat HelloWorld.java
import java.util.Scanner;

public class HelloWorld {

    public static void main(String[] args) {
        System.out.println("Hello, World");
=09
	Scanner scan =3D new Scanner( System.in );
	String value =3D scan.nextLine();
    }

}
=1B]0;~/cs4500/hw2=07
luser@LAPTOP-K627HB8A ~/cs4500/hw2
$ javac HelloWorld.java
=1B]0;~/cs4500/hw2=07
luser@LAPTOP-K627HB8A ~/cs4500/hw2
$ java HelloWorld
Hello, World

=1B]0;~/cs4500/hw2=07
luser@LAPTOP-K627HB8A ~/cs4500/hw2
$ exit

Process shell finished


Here, I just typed a single Return key after "Hello, World" was printed.
I did not type "exit", but that's what emacs adds when you do hit ^D.=20
So it seems like java is closing stdin or somehow stuffing an EOF indicator
into it.

This doesn't happen if I run it from the Windows command line. eg.

C:\cygwin64\home\luser\cs4500\hw2>java HelloWorld
Hello, World


C:\cygwin64\home\luser\cs4500\hw2>


It also doesn't happen if I run it from Xterm. eg.

luser@LAPTOP-K627HB8A ~/cs4500/hw2
$ java HelloWorld
Hello, World


luser@LAPTOP-K627HB8A ~/cs4500/hw2
$=20


So I guess it's something weird that the Emacs terminal is doing, and=20
not bash per se.