Improve Kotlin support #5537
Description
Placeholder issue for things we can do to improve Kotlin support
@value
Using @Value("${thing}") is a pain because you need to escape $ (e.g. @Value("\${thing}"). Perhaps a different key like @Value("#{thing}").
Open Classes
Open classes are a pain, can we use a classloader to remove final.
Also all @Bean methods
perhaps we can use a custom bean classloader
Default constructor arguments with @Autowired
Give a constructor with a default param:
open class Foo @Autowired constructor(val restTemplate: RestOperation = NoOpRestOperation());
Kotlin will create multiple constructors, this makes Spring fall over because there's multiple annotated constructors. A method to be smart about which to pick would be nice.
Main method
@JvmStatic is needed for main methods. Check if we can find them automatically. Also the name of the class is a bit mad ThePackageKt so perhaps we can replace it with something nice.
Add Kotlin Module
Look at Jackson for an example.