# I don't know how to specify a comma as a value for \`gatling.jvmArgs\` **URL:** \ **Category:** Gatling (Open-Source)\ **Created:** [September 4, 2026, 3:20am UTC](https://community.gatling.io/t/i-dont-know-how-to-specify-a-comma-as-a-value-for-gatling-jvmargs/9891 "2026-09-04T03:20:33Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![CEK](https://avatars.discourse-cdn.com/v4/letter/c/e274bd/32.png) [@CEK](https://community.gatling.io/u/CEK)\ **Post date:** [September 4, 2026, 3:20am UTC](https://community.gatling.io/t/i-dont-know-how-to-specify-a-comma-as-a-value-for-gatling-jvmargs/9891/1 "2026-09-04T03:20:33Z")
**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](https://community.gatling.io/t/welcome-in-the-gatling-community-our-code-of-conduct/6462) and [how to ask a question](https://community.gatling.io/t/how-to-ask-a-question/6538) topics. I provided a [SSCCE](http://www.sscce.org/) (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](http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException) 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. ---
**Author:** ![slandelle](https://dub1.discourse-cdn.com/flex013/user_avatar/community.gatling.io/slandelle/32/4_2.png) [@slandelle](https://community.gatling.io/u/slandelle)\ **Post date:** [September 4, 2026, 7:02am UTC](https://community.gatling.io/t/i-dont-know-how-to-specify-a-comma-as-a-value-for-gatling-jvmargs/9891/2 "2026-09-04T07:02:26Z")
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. ---
**Author:** ![CEK](https://avatars.discourse-cdn.com/v4/letter/c/e274bd/32.png) [@CEK](https://community.gatling.io/u/CEK)\ **Post date:** [September 8, 2026, 12:42am UTC](https://community.gatling.io/t/i-dont-know-how-to-specify-a-comma-as-a-value-for-gatling-jvmargs/9891/3 "2026-09-08T00:42:48Z")
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. ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex013/uploads/gatling2/original/2X/b/b148e0742de35c6280726cabf3ecd3de2d320f63.png) [@system](https://community.gatling.io/u/system)\ **Post date:** [October 8, 2026, 12:43am UTC](https://community.gatling.io/t/i-dont-know-how-to-specify-a-comma-as-a-value-for-gatling-jvmargs/9891/4 "2026-10-08T00:43:04Z")
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