Hello, I'm attempting to change Java 8 code to Kotlin, which includes changing field-based injection...

# spring

[minus]

Hello, I'm attempting to change Java 8 code to Kotlin, which includes changing field-based injection to constructor-based injection, but Spring is throwing me errors about missing default constructors. This isn't exactly a problem Kotlin specifically because it also fails when trying in Java, but maybe there's a trick to it that someone here knows. (Spring 4.2.6, Spring Boot 1.3.5)

[nayanjyoti]

@minus : are the constructor based injections annotated with @Autowired

[minus]

in kotlin yes, in java it complained that @Autowired wasn't allowed with parameters

[agomez]

did you added the constructor keyword as explained here https://kotlinlang.org/docs/reference/annotations.html#usage ?

[minus]

ah yep, putting the annotation on the constructor instead of with the args (no compiler error on kotlin?) makes it work, thanks, @agomez @nayanjyoti

[nfrankel]

@Autowired on constructors is not required since latest versions of Spring
try without 🙂

[nerses]

@nfrankel it will require an upgrade to spring 4.3

[nerses]

@minus is using (Spring 4.2.6, Spring Boot 1.3.5)

[nfrankel]

@nerses ok