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

On Tue, Sep 30, 2025 at 5:04=E2=80=AFAM Claude Warren <[email protected]> wr=
ote:
>
> Opened ticket: https://issues.apache.org/jira/browse/CLI-351 to track.
> I have found the issue and a fix.

TY Claude! PR merged. This is now fixed in git master and snapshot
builds https://repository.apache.org/content/repositories/snapshots/commons=
-cli/commons-cli/1.10.1-SNAPSHOT

Gary

>
> On Mon, Sep 29, 2025 at 7:38=E2=80=AFPM Gary Gregory <garydgregory@gmail.=
com> 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 lo=
op
> > > when its is passed a header or footer that contains 2 or more new lin=
e
> > > (\n) characters.
> > >
> > > The following code shows this behaviour:
> > >
> > >          final HelpFormatter formatter =3D HelpFormatter.builder().ge=
t();
> > >
> > >          // 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 en=
ter
> > > 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, t=
his
> > > should not end in an infinite loop.
> > >
> > > Regards,
> > >
> > > Damien Carbonne
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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> --
> LinkedIn: http://www.linkedin.com/in/claudewarren