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The @Inject annotation for a service, defined by "@ApplicationScope" fails to inject in Kotlin.

"kotlin.UninitializedPropertyAccessException: lateinit property greeter has not been initialized"

The explanation on similar question: "This problem results as a combination of how Kotlin handles annotations and the lack of the a @Target on the ... annotation definition. Add @field: xxx"

Question is, how do I make this work for a service injection?

import com.amazonaws.services.lambda.runtime.Context
import com.amazonaws.services.lambda.runtime.RequestHandler
import javax.enterprise.context.ApplicationScoped
import javax.inject.Inject


class HelloRequest() {
    var firstName: String? = null
    var lastName: String? = null
}

@ApplicationScoped
open class HelloGreeter() {
    open fun greet(firstName: String?, lastName: String?): String {
        return "$firstName, $lastName"
    }
}

class HelloLambda : RequestHandler<HelloRequest, String> {

    @Inject
    lateinit var greeter: HelloGreeter

    override fun handleRequest(request: HelloRequest, context: Context): String {
        return greeter.greet(request.firstName, request.lastName)
    }
}

Similar questions: "This problem results as a combination of how Kotlin handles annotations and the lack of the a @Target on the ... annotation definition. Add @field: xxx"

  • Error to inject some dependency with kotlin + quarkus
  • SmallRye Reactive Messaging's Emitter<>.send doesn't send in Kotlin via AMQP broker with Quarkus
    • oztimpower
    • 31
    • 2
    • This happened to me when I had defined a ContainerRequestFilter in one project (a security specific project) and tried to use this as a dependency in another project (which contained my resource). The answer by OP fixed it. – Roxcly Mar 10 '22 at 21:22

    1 Answers1

    2

    I tested the modified, @field: xx with a standard rest service, and by qualifying it with @field: ApplicationScoped, it does now work.

    The answer to my question above would be then that there is no runtime CDI when using the Quarkus Amazon Lambda extension.

    import javax.enterprise.context.ApplicationScoped
import javax.inject.Inject
import javax.ws.rs.GET
import javax.ws.rs.Path
import javax.ws.rs.PathParam
import javax.ws.rs.Produces
import javax.ws.rs.core.MediaType


@ApplicationScoped
open class GreetingService2 {

    fun greeting(name: String): String {
        return "hello $name"
    }

}

@Path("/")
class GreetingResource {

    @Inject
    @field: ApplicationScoped
    lateinit var service: GreetingService2

    @GET
    @Produces(MediaType.TEXT_PLAIN)
    @Path("/greeting/{name}")
    fun greeting(@PathParam("name") name: String): String {
        return service.greeting(name)
    }

    @GET
    @Produces(MediaType.TEXT_PLAIN)
    fun hello(): String {
        return "hello"
    }
}
    oztimpower
    • 31
    • 2