Re: apache commons cli 1.10.0: infinite loop in HelpFormatter.printHelp()

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Opened ticket: https://issues.apache.org/jira/browse/CLI-351 to track.
I have found the issue and a fix.

On Mon, Sep 29, 2025 at 7:38=E2=80=AFPM Gary Gregory <[email protected]=
m> wrote:

> I can reproduce this. Any thoughts on a fix, Claude?
>
> Gary
>
> On Mon, Sep 29, 2025 at 12:40=E2=80=AFPM Damien Carbonne
> <[email protected]> wrote:
> >
> > Hi,
> >
> > Starting with commons-cli-1.10.0, HelpFormatter enters an infinite loop
> > when its is passed a header or footer that contains 2 or more new line
> > (\n) characters.
> >
> > The following code shows this behaviour:
> >
> >          final HelpFormatter formatter =3D HelpFormatter.builder().get(=
);
> >
> >          // OK
> >          formatter.printHelp("CL syntax",
> >                              "Header",
> >                              Collections.emptyList(),
> >                              "Footer",
> >                              true);
> >
> >          // KO Header (same behaviour with footer)
> >          formatter.printHelp("CL syntax",
> >                              "Header\n\n", // This makes printHelp ente=
r
> > into an infinite loop
> >                              Collections.emptyList(),
> >                              "Footer",
> >                              true);
> >
> > It looks like a regression. Using several new line characters with
> > previous versions of CLI was working.
> > Even if using new line character in header or footer was forbidden, thi=
s
> > should not end in an infinite loop.
> >
> > Regards,
> >
> > Damien Carbonne
> >
> >
> >
> >
> >
> >
> >
> >
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> >
>
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