From mail at dries.net  Wed Aug 13 17:59:48 2025
From: mail at dries.net (Dries Samyn)
Date: Wed, 13 Aug 2025 18:59:48 +0100
Subject: Bug in -jvmArgs parsing?
Message-ID: <CA+NrA8g9T8U9B46a625cZYrNawB6i5A9AkbniN9V1TkmV1C_xA@mail.gmail.com>

I'm not sure this is considered a bug as it matches the documented
behaviour, but I can't think of a clean workaround if it is.

I believe arguments passed into the -jvmArgs option are space delimited.
However, this is problematic when those arguments include spaces as part of
the value.
For example, I am trying to create a custom profiler for YourKit
integration, but the YourKit agent, by default, has spaces in its path on
MacOs, which means trying to pass it in the jvmArgs option is problematic.

I have created a reproduction of the issue and explanation here:
https://github.com/driessamyn/jmh-spaces-bug-reproduction

Looking forward to hearing thoughts on this.

Dries.
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From kirk.pepperdine at gmail.com  Thu Aug 14 07:08:33 2025
From: kirk.pepperdine at gmail.com (Kirk Pepperdine)
Date: Thu, 14 Aug 2025 09:08:33 +0200
Subject: Bug in -jvmArgs parsing?
In-Reply-To: <CA+NrA8g9T8U9B46a625cZYrNawB6i5A9AkbniN9V1TkmV1C_xA@mail.gmail.com>
References: <CA+NrA8g9T8U9B46a625cZYrNawB6i5A9AkbniN9V1TkmV1C_xA@mail.gmail.com>
Message-ID: <F0623DEE-DDBD-4702-9160-93319821182F@gmail.com>

Hi Dries,

Have you tried escaping the spaces to that the shell doesn?t split the value?

Kind regards,
Kirk


> On Aug 13, 2025, at 7:59?PM, Dries Samyn <mail at dries.net> wrote:
> 
> I'm not sure this is considered a bug as it matches the documented behaviour, but I can't think of a clean workaround if it is.
> 
> I believe arguments passed into the -jvmArgs option are space delimited. However, this is problematic when those arguments include spaces as part of the value.
> For example, I am trying to create a custom profiler for YourKit integration, but the YourKit agent, by default, has spaces in its path on MacOs, which means trying to pass it in the jvmArgs option is problematic.
> 
> I have created a reproduction of the issue and explanation here: https://github.com/driessamyn/jmh-spaces-bug-reproduction
> 
> Looking forward to hearing thoughts on this.
> 
> Dries.
> 

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From mail at dries.net  Fri Aug 15 06:31:24 2025
From: mail at dries.net (Dries Samyn)
Date: Fri, 15 Aug 2025 07:31:24 +0100
Subject: Bug in -jvmArgs parsing?
Message-ID: <CA+NrA8if+WKu_e=j3gix8Y=nyEdOi0KZxb+qzK7xBGg+2Y1F5Q@mail.gmail.com>

Hi Kirk,

I don't think it is the shell that is splitting the value as the jvmArgs is
quoted, I think it is when the argument is parsed.
I tried \ escaping the spaces as well.

java -jar build/libs/jmh-spaces-bug-reproduction-jmh.jar \
  -jvmArgs "-javaagent:/tmp/agent with spaces/dummy.jar"

java -jar build/libs/jmh-spaces-bug-reproduction-jmh.jar \
  -jvmArgs "-javaagent:/tmp/agent\ with\ spaces/dummy.jar"

I can see the the description of the flag suggest it is a space
space-separated line, which makes me think this is intended behaviour,
however, I cannot understand how a value containing spaces can then be used:

  -jvmArgs <string>           Use given JVM arguments. Most options are
inherited
                              from the host VM options, but in some cases
you want
                              to pass the options only to a forked VM.
Either single
                              space-separated option line, or multiple
options
                              are accepted. This option only affects forked
runs.


Dires.

On Thu, 14 Aug 2025, 8:08?am Kirk Pepperdine, <kirk.pepperdine at gmail.com>
wrote:

> Hi Dries,
>
> Have you tried escaping the spaces to that the shell doesn?t split the
> value?
>
> Kind regards,
> Kirk
>
>
> On Aug 13, 2025, at 7:59?PM, Dries Samyn <mail at dries.net> wrote:
>
> I'm not sure this is considered a bug as it matches the documented
> behaviour, but I can't think of a clean workaround if it is.
>
> I believe arguments passed into the -jvmArgs option are space delimited.
> However, this is problematic when those arguments include spaces as part of
> the value.
> For example, I am trying to create a custom profiler for YourKit
> integration, but the YourKit agent, by default, has spaces in its path on
> MacOs, which means trying to pass it in the jvmArgs option is problematic.
>
> I have created a reproduction of the issue and explanation here:
> https://github.com/driessamyn/jmh-spaces-bug-reproduction
>
> Looking forward to hearing thoughts on this.
>
> Dries.
>
>
>
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