Document spring-boot.run.arguments behaviour with multiple arguments

[ebussieres]

Since version 2.2.3.RELEASE, I have a regression when using command line arguments from Maven plugin.

When I use the maven plugin and pass multiple arguments, the args array contains only one value. For example, if I use the following command line, the array will containe only one value.

mvn spring-boot:run -Dspring-boot.run.arguments="param1,param2"

It was working with version 2.2.2.RELEASE

An example can be found here : https://github.com/ebussieres/spring-boot-run-bug

[snicoll]

Thanks for the report. That's an effect of fixing a bug that harmonize how such an argument should be processed on the command-line, see #18711.

Arguments on the command line have to be separated by a space (to allow commas to be used in the value itself).

mvn spring-boot:run -Dspring-boot.run.arguments="param1 param2"

This is documented but for some reasons I can't see that being reflected on the generated web site so we'll use this issue to improve that.

[ebussieres]

And if my parameter contains space, does it have a workaround ?

[snicoll]

It's also specified in the doc that's supposed to show up. You need to quote it.

What I meant by harmonizing is that we now use the same mechanism as any other Maven plugin does so there are plenty of resources online about that stuff.

[glmars]

@snicoll Unfortunately, these breaking changes still aren't documented in the Spring Boot 2.2 Release Notes 😬