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using_kotlin.md: Clarify 'class' vs 'object'

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Karol Lewandowski 2022-12-01 16:58:11 +01:00
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topics/tutorials/using_kotlin.md
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@ -112,9 +112,10 @@ Please see [Third-Party Software and Licenses](https://www.jetbrains.com/legal/t
## Caution
Plugins *may* use [Kotlin classes](https://kotlinlang.org/docs/classes.html) to implement declarations in the [plugin configuration file](plugin_configuration_file.md).
When registering an extension, the platform uses a dependency injection framework to instantiate these classes.
For this reason, plugins *must not* use [Kotlin objects](https://kotlinlang.org/docs/object-declarations.html) to implement any <path>[plugin.xml](plugin_configuration_file.md)</path> declarations.
Plugins *may* use [Kotlin classes](https://kotlinlang.org/docs/classes.html) (`class` keyword) to implement declarations in the [plugin configuration file](plugin_configuration_file.md).
When registering an extension, the platform uses a dependency injection framework to instantiate these classes at runtime.
For this reason, plugins *must not* use [Kotlin objects](https://kotlinlang.org/docs/object-declarations.html#object-declarations-overview) (`object` keyword) to implement any <path>[plugin.xml](plugin_configuration_file.md)</path> declarations.
Managing the lifecycle of extensions is the platform responsibility and instantiating these classes as Kotlin singletons may cause issues.
## Kotlin Code FAQ