IntelliJ IDEA: Fix “Command line is too long” when running tests

I could run my integration tests from the command line using mvn test without any issues.

However, when I tried to run the same tests from IntelliJ IDEA, I hit this error:

Command line is too long.

After googling a bit I found how I can solve this problem. You can do the fix in 2 possible ways: from the UI or by editing the config file directly.

Option 1. Edit the config file

Open the .idea/workspace.xml file and locate your <configuration> block. Inside it, add one of the following options:

<shortenClasspath name=”ARGS_FILE” />

or:

<shortenClasspath name=”MANIFEST” />

Option 2. Configure it via the UI

Alternatively, you can configure the same thing from the UI: you can click on the configuration in the top right corner, click on the button “Edit Configurations…”, then find “Modify Options”, and enable “Shorten command line…”. After this a “Shorten command line” dropdown list appears. Select @argfile (Java 9+ or JAR manifest in there.

That’s it - your tests should now run in IntelliJ just like they do from the command line.