I tried using ```@ConstructorBinding @ConfigurationProperties("push") data class PushServicesProper...

# spring

[EricJTurley]

I tried using

@ConstructorBinding
@ConfigurationProperties("push")
data class PushServicesProperties(val snsClient: SnsClient) {

    data class SnsClient(
        val maxConnections: Int,
        val connectionTimeout: Int,
        val socketTimeout: Int,
        val proxyHost: String,
        val proxyPort: Int
    )
}

But I'm still getting No default constructor found for the PushServiceProperties class.
Has anyone else had that problem? Everything looks normal...

[Egor Babarykin]

Did you added this in build.gradle.kts?

plugins {
  ...
  kotlin("kapt") version "1.3.60"
}

dependencies {
  ...
  kapt("org.springframework.boot:spring-boot-configuration-processor")
}

[Egor Babarykin]

It is documented on https://spring.io/guides/tutorials/spring-boot-kotlin/

[EricJTurley]

Yes - altho in maven.

[EricJTurley]

oh ... waaaaaiiiiit.....

[EricJTurley]

Kotlin 1.3.60 - but not kapt....
Gimme a sec 🙂

[EricJTurley]

Do I need kapt to make @ConstructorBinding work? Or just to make metadata-generation work?

[EricJTurley]

Well ... I've added it now, but it hasn't made a difference.
Tho - for maven I'm not exactly sure what's required.

[Emerson Farrugia]

@EricJTurley I thought it was just for metadata generation

[Czar]

Encountered the same problem today after updating from 2.2.0.RC1 to 2.2.1.RELEASE.
Found a workaround:
Now we need to annotate embedded property classes with `@ConstructorBinding`as well. In your case:

@ConstructorBinding
data class SnsClient(
//...

no other changes are necessary, kapt stuff is only needed for metadata generation.

[kqr]

is it workaround? it does make sense, doesn't it?

[EricJTurley]

@Czar I had tried that, too, based on comments I saw in some Spring issues (or something). Didn't work for me. 😞

[EricJTurley]

@kqr It's definitely a workaround. The @ConstructorBinding annotation should extend to the nested properties classes.

[Czar]

@EricJTurley strange...

[EricJTurley]

Yeah. Just tried again.
Specifically, I have a test:

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.NONE/*mocked*/,
                classes = EndpointRegistrationServicesConfiguration.class)
class PushServicePropertiesTest {

    @Autowired
    PushServicesProperties pushServicesProperties; // <--- Java properties class

    @Autowired
    PushProperties1 pushProperties1; // <--- Kotlin data properties class
}

And I get:

ConfigurationPropertiesBindException
Could not bind properties to 'PushProperties1'
BeanInstantiationException 'PushProperties1'
No default constructor found
NoSuchMethodException: com.blizzard.bnet.push.endpoint.services.PushProperties1.<init>()

[EricJTurley]

OK, I saw a Spring issue that wasn't included until 2.2.1, so I upgraded.
But now I get a different error regarding the nested SnSClient class:

Parameter 0 of constructor in com.blizzard.bnet.push.endpoint.services.PushServicesProperties1 required a bean of type 'com.blizzard.bnet.push.endpoint.services.PushServicesProperties1$SnsClient' that could not be found.

Failed to load ApplicationContext
No qualifying bean of type 'com.blizzard.bnet.push.endpoint.services.PushServicesProperties1$SnsClient' available

[EricJTurley]

I also added the @ConstructorBinding annotation to the inner class

[EricJTurley]

Even tried adding defaults, until the final class is:

@ConstructorBinding
@ConfigurationProperties("push1")
data class PushServicesProperties1(val snsClient: SnsClient) {

    @ConstructorBinding
    data class SnsClient(
        val maxConnections: Int = -1,
        val connectionTimeout: Int = 10000,
        val socketTimeout: Int = 10000,
        val proxyHost: String = "",
        val proxyPort: Int? = null
    )
}