I don't know how to specify a comma as a value for `gatling.jvmArgs`

Gatling (Open-Source)
1

Gatling version:3.14.9
Gatling flavor: java kotlin scala javascript typescript
Gatling build tool: maven gradle sbt bundle npm

I made sure I’ve update my Gatling version to the latest release
I read the guidelines and how to ask a question topics.
I provided a SSCCE (or at least, all information to help the community understand my topic)
I copied output I observe, and explain what I think should be.

Hello,

I have a question about `gatling.jvmArgs`.

Running the included BasicSimulation as shown below completes successfully.

.\mvnw.cmd gatling:test “-Dgatling.simulationClass=example.BasicSimulation” “-Dgatling.jvmArgs=-Xms512m,-Xmx512m,-Xlog:gc*:file=gc.log:t”

However, an error occurs when running the included BasicSimulation as shown below.
*Note: The decorator has been changed from t to t,l.

.\mvnw.cmd gatling:test “-Dgatling.simulationClass=example.BasicSimulation” “-Dgatling.jvmArgs=-Xms512m,-Xmx512m,-Xlog:gc*:file=gc.log:t,l”

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.477 s
[INFO] Finished at: 2026-09-04T11:54:04+09:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal io.gatling:gatling-maven-plugin:4.20.8:test (default-cli) on project gatling-maven-plugin-demo-java: Gatling failed.: ForkException → [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] MojoExecutionException - Apache Maven - Apache Software Foundation

I ran it again with the -X option.

.\mvnw.cmd gatling:test “-Dgatling.simulationClass=example.BasicSimulation” “-Dgatling.jvmArgs=-Xms512m,-Xmx512m,-Xlog:gc*:file=gc.log:t,l” -X

You will see output like the following in the console.

[DEBUG] (f) jvmArgs = [-Xms512m, -Xmx512m, -Xlog:gc*:file=gc.log:t, l]

I would like to specify the following three:
-Xms512m
-Xmx512m
-Xlog:gc*:file=gc.log:t,l

However, in reality, -Xlog:gc*:file=gc.log:t,l is split by commas, resulting in the following four items being specified:
-Xms512m
-Xmx512m
-Xlog:gc*:file=gc.log:t
l

Is it possible to pass the option -Xlog:gc*:file=gc.log:t,l by escaping the commas or using a similar method?
Also, are there any other ways to pass -Xlog:gc*:file=gc.log:t,l to the Gatling process?

Thank you.

2

That’s not possible. Comma is the list separator in maven. You can try configuring these in your pom.xml and only enable them based on a profile.

3

Thank you for your reply.

I wasn’t aware that JVM arguments for the Gatling process could also be configured in the pom.xml.

I confirmed that, by configuring them in the pom.xml as you suggested, it is possible to pass configuration values containing commas.

This solves my issue. Thank you for the helpful suggestion.