How to set maximum heap size (-Xmx) for Java application that gets started via "gradle run"?

Question

If we want to clean, build and then run our application, we use ./gradlew clean run. run is part of the Gradle Application plugin.

What we want to achieve is to assign a certain maximum heap size to the application using run, something similar to ./gradlew clean run -Xmx1G. The result should equal running java -Xmx16G -jar /path/to/my/app.jar.

Is there a way to achieve this?

Edit: Just to make sure, I do not want to increase the build deamons's max heap but the max heap of the application that gets started by gradle.

you could set JAVA_TOOL_OPTIONS on the environment (export JAVA_TOOL_OPTIONS=-Xmx1G"), every jvm that is started by any subprocess will pick up that string and treat it as if it was specified directly in the commandline — Philipp Lengauer
– Philipp Lengauer, Commented Oct 3, 2017 at 11:31
@BenoArakelyan: Thanks, that works! Do you also know a solution where I can pass such applicationDefaultJvmArgs on the command line like ./gradlew clean run applicationDefaultJvmArgs=["-Xmx1G"]? — Markus Weninger
– Markus Weninger, Commented Oct 3, 2017 at 11:37

araknoid · Accepted Answer · 2017-10-05 07:30:37Z

7

As reported in the Installing Gradle documentation for version 4.2.1:

Note that it’s not currently possible to set JVM options for Gradle on the command line.

What you are looking for can be achieved modifying the build.gradle script. You can do it adding this little code snippet to your build.gradle file:

tasks.withType(JavaExec) {
    jvmArgs = ['-Xmx16g']
}

If you want to configure also the initial Java heap size, add the following code:

tasks.withType(JavaExec) {
    jvmArgs = ['-Xms1g', '-Xmx16g']
}

edited Oct 5, 2017 at 7:30

answered Oct 3, 2017 at 11:57

araknoid

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