Update 2.2 release notes to note that spring-boot:run now forks a new JVM by default

[ryenus]

After updating to spring boot version 2.2.0.RELEASE, some properties passed along with mvn spring-boot:run doesn't work.

For example, with a project using spring boot starter 2.2.0.RELEASE:

mvn -Dspring.profiles.active=cloud spring-boot:run

The profile reported in the console is still default:

No active profile set, falling back to default profiles: default

But when run with previous version of spring boot maven plugin

mvn -Dspring.profiles.active=cloud \
org.springframework.boot:spring-boot-maven-plugin:2.1.9.RELEASE:run

The active profile is then reported correctly:

The following profiles are active: cloud

[wilkinsona]

Thanks for the report. You are passing a system property into Maven's JVM and relying upon this being the same JVM as the one that runs your application. The doesn't hold true in 2.2 where we switched to forking by default. You should use -Dspring-boot.run.jvmArguments to pass arguments to the JVM that runs your app and we should check that this change is mentioned in the release notes for 2.2.

[ryenus]

@wilkinsona thank you for the prompt response!
I just did a quick check with -Dspring-boot.run.jvmArguments and it worked:

mvn -Dspring-boot.run.jvmArguments=-Dspring.profiles.active=cloud spring-boot:run

However, with fork mode now on by default, it becomes problematic to start a debug process when launched within Intellij IDEA for me, I was wondering why the debug session could no longer be attached, and this seems to be the cause. (yeah, I probably should use Application.main directly)

May I ask if there's a way to turn off the fork mode when using mvn spring-boot:run?

---

A side note, to set active spring profiles, another way is to use the environment variable SPRING_PROFILES_ACTIVE, which works consistently regardless fork mode is on of off.

[ryenus]

Ah, never mind, I figured it out:

mvn -Dspring-boot.run.fork=false spring-boot:run

Reference: https://docs.spring.io/spring-boot/docs/current/maven-plugin/run-mojo.html#fork

[snicoll]

A section has been added in the release notes.