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kotlinlang

so I have my little <https://github.com/simon-void/java_to_kotlin_config_demo/tree/kotlin_config|demo project with a minimal Spring Boot Application with Maven and Kotlin> and it works, but there are two open questions:
• adding `&lt;kotlin.compiler.jvmTarget&gt;11&lt;/kotlin.compiler.jvmTarget&gt;` to the properties section of the main pom-file should switch the bytecode version, produced, but doesn't (i also tried `&lt;kotlin.compiler.jvmTarget&gt;"11"&lt;/kotlin.compiler.jvmTarget&gt;` because that's how the <https://kotlinlang.org/docs/maven.html#attributes-specific-to-jvm|documentation> shows it, but I've see a <https://youtrack.jetbrains.com/issue/KE-336/jvmTarget-version-ignored|bug ticket> where an Int was used and nobody complained about it) but the Bytecode version is still JDK17 which is the JDK at JAVA_HOME: 
```$ file ./application/target/classes/com/example/multimodule/application/MyController.class 
./application/target/classes/com/example/multimodule/application/MyController.class: compiled Java class data, version 61.0```
• the <https://kotlinlang.org/docs/maven.html#use-jdk-17|documentation> tells me to create a `./mvn/jvm.config`  file with
```--add-opens=java.base/java.lang=ALL-UNNAMED
--add-opens=java.base/java.io=ALL-UNNAMED```
in it in order to use JDK 17, but it didn't and everything still worked und I do use a JDK 17 :man-shrugging: I later added it and nothing changed. So what is this supposed to be for?

the spring boot parent manages the target based on the `java.version` property