Native compile error when using Kotlin and WebFlux with coRouter

[Kotlin-GDE]

spring framework 6.0.2 (spring boot 3.0.0) , graalvm 22.3.0 (java 17.0.5)

routes dsl definition

fun routes(employeeHandler: EmployeeHandler, attendanceHandler: AttendanceHandler) = coRouter {

    "$APPLICATION_BASE_URL/employee".nest {
        GET("", employeeHandler::findAll)
        GET("/{id}", employeeHandler::find)
        POST("/save", employeeHandler::save)

        "/delete".nest {
            DELETE("", employeeHandler::deleteAll)
            DELETE("/{id}", employeeHandler::delete)
        }
    }


    "$APPLICATION_BASE_URL/login".nest {
        GET("", attendanceHandler::findAll)
        GET("/{deviceId}", attendanceHandler::findByEmployee)
        POST("/save", attendanceHandler::save)

        "/delete".nest {
            DELETE("", attendanceHandler::deleteAll)
            DELETE("/query", attendanceHandler::deleteByMonthAndYear)
            DELETE("/{deviceId}", attendanceHandler::deleteByEmployee)
        }
    }
}

spring main application

@SpringBootApplication
class AttendanceMainApp

fun main() {
    runApplication<AttendanceMainApp> {
        addInitializers(
            beans {
                bean<EmployeeService>()
                bean<EmployeeHandler>()
                bean<AttendanceService>()
                bean<AttendanceHandler>()
                bean(::routes)
            }
        )
    }
}

when launch gradle task: gradle nativeCompile an exception appear

2022-12-07T10:18:49.792+01:00  INFO 166674 --- [           main] dev.attendance.AttendanceMainAppKt       : Starting AttendanceMainAppKt using Java 17.0.5 with PID 166674 (/home/halim/Desktop/attendance-service/build/classes/kotlin/main started by halim in /home/halim/Desktop/attendance-service)
2022-12-07T10:18:49.796+01:00  INFO 166674 --- [           main] dev.attendance.AttendanceMainAppKt       : No active profile set, falling back to 1 default profile: "default"
2022-12-07T10:18:50.548+01:00  INFO 166674 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data Reactive MongoDB repositories in DEFAULT mode.
2022-12-07T10:18:50.580+01:00  INFO 166674 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 25 ms. Found 0 Reactive MongoDB repository interfaces.
Exception in thread "main" java.lang.IllegalStateException: No constructor or factory method candidate found for Root bean: class [org.springframework.web.reactive.function.server.RouterFunction]; scope=singleton; abstract=false; lazyInit=true; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodNames=null; destroyMethodNames=null and argument types []
        at org.springframework.beans.factory.support.ConstructorResolver.resolveConstructorOrFactoryMethod(ConstructorResolver.java:939)
        at org.springframework.beans.factory.support.RegisteredBean.resolveConstructorOrFactoryMethod(RegisteredBean.java:197)
        at org.springframework.beans.factory.aot.BeanDefinitionMethodGenerator.<init>(BeanDefinitionMethodGenerator.java:79)
        at org.springframework.beans.factory.aot.BeanDefinitionMethodGeneratorFactory.getBeanDefinitionMethodGenerator(BeanDefinitionMethodGeneratorFactory.java:102)
        at org.springframework.beans.factory.aot.BeanDefinitionMethodGeneratorFactory.getBeanDefinitionMethodGenerator(BeanDefinitionMethodGeneratorFactory.java:118)
        at org.springframework.beans.factory.aot.BeanRegistrationsAotProcessor.processAheadOfTime(BeanRegistrationsAotProcessor.java:45)
        at org.springframework.beans.factory.aot.BeanRegistrationsAotProcessor.processAheadOfTime(BeanRegistrationsAotProcessor.java:35)
        at org.springframework.context.aot.BeanFactoryInitializationAotContributions.getContributions(BeanFactoryInitializationAotContributions.java:67)
        at org.springframework.context.aot.BeanFactoryInitializationAotContributions.<init>(BeanFactoryInitializationAotContributions.java:49)
        at org.springframework.context.aot.BeanFactoryInitializationAotContributions.<init>(BeanFactoryInitializationAotContributions.java:44)
        at org.springframework.context.aot.ApplicationContextAotGenerator.lambda$processAheadOfTime$0(ApplicationContextAotGenerator.java:58)
        at org.springframework.context.aot.ApplicationContextAotGenerator.withCglibClassHandler(ApplicationContextAotGenerator.java:67)
        at org.springframework.context.aot.ApplicationContextAotGenerator.processAheadOfTime(ApplicationContextAotGenerator.java:53)
        at org.springframework.context.aot.ContextAotProcessor.performAotProcessing(ContextAotProcessor.java:106)
        at org.springframework.context.aot.ContextAotProcessor.doProcess(ContextAotProcessor.java:84)
        at org.springframework.context.aot.ContextAotProcessor.doProcess(ContextAotProcessor.java:49)
        at org.springframework.context.aot.AbstractAotProcessor.process(AbstractAotProcessor.java:82)
        at org.springframework.boot.SpringApplicationAotProcessor.main(SpringApplicationAotProcessor.java:76)

whats wrong !!!

[bclozel]

Could you share a minimal sample application that reproduces the problem? Ideally, an application created from start.spring.io and shared as a git repository or a zip file. Thanks!

[Kotlin-GDE]

this is the link of ATENDANCE-SERVICE

https://github.com/halimpuckjava/attendance-service.git

[scottfrederick]

This sample can be simplified significantly and still reproduce the problem.

1. Create a new project from start.spring.io using these options: https://start.spring.io/#!type=gradle-project-kotlin&language=kotlin&platformVersion=3.0.0&packaging=jar&jvmVersion=17&groupId=com.example&artifactId=demo&name=demo&description=Demo%20project%20for%20Spring%20Boot&packageName=com.example.demo&dependencies=native,webflux

2. Add src/main/kotlin/com/example/demo/Routes.kt that looks like this:

package com.example.demo

import org.springframework.web.reactive.function.server.coRouter

fun routes() = coRouter {
}

4. Modify main in DemoApplication.kt to look like this:

fun main(args: Array<String>) {
	runApplication<DemoApplication> {
		addInitializers(
			beans {
				bean(::routes)
			}
		)
	}
}

Running ./gradlew nativeCompile give the same error as above.

[scottfrederick]

@halimpuckjava As a work-around, this change to main in your sample allows ./gradle nativeCompile to succeed:

fun main() {
    runApplication<AttendanceMainApp> {
        addInitializers(
            beans {
                bean<EmployeeService>()
                bean<EmployeeHandler>()
                bean<AttendanceService>()
                bean<AttendanceHandler>()
            }
        )
    }
}

@Configuration
class RouterConfiguration {

    @Bean
    fun router() = ::routes

}

[Kotlin-GDE]

thanks, i will try it and give you a feed back

[sdeleuze]

This issue is a duplicate of #29555.