BeanCreationException when using c-namespace, Kotlin class with default constructor and annotation configuration [SPR-16289]

[spring-projects-issues]

Alexander Chernikov opened SPR-16289 and commented

#20571 is fixed in Spring 5.0.2.
However, I've found minor sub-case when using c-namespace.

Dummy Kotlin:

package cr.spr16022

import org.springframework.context.annotation.Configuration
import org.springframework.context.annotation.ImportResource
import org.springframework.context.support.ClassPathXmlApplicationContext
import org.springframework.context.annotation.AnnotationConfigApplicationContext

class KotlinCtor(val intVal: Int) {
    constructor(p: String) : this(p.length)
}

class KotlinQtor() {
    constructor(p: String) : this()
}

@Configuration @ImportResource("cr.xml") class KotlinAnnotator

object Main {
    @JvmStatic fun main(args: Array<String>) {
        val contextXml = ClassPathXmlApplicationContext("cr.xml")
//        val contextAnn = AnnotationConfigApplicationContext(KotlinAnnotator::class.java)
    }
}

Beans definition:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:c="http://www.springframework.org/schema/c"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean class="cr.spr16022.KotlinCtor" name="ctor0s" c:p="a"/>
    <bean class="cr.spr16022.KotlinQtor" name="qtor0s" c:p="a"/>
</beans>

Run this dummy main(): no problems.
Uncomment contextAnn declaration and initialization, re-run: fail:

WARNING: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'qtor0s' defined in class path resource [cr.xml]: Could not resolve matching constructor (hint: specify index/type/name arguments for simple parameters to avoid type ambiguities)
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'qtor0s' defined in class path resource [cr.xml]: Could not resolve matching constructor (hint: specify index/type/name arguments for simple parameters to avoid type ambiguities)
	at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:243)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1270)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1127)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:758)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:868)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
	at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:88)
	at cr.spr16022.Main.main(KotlinCtor.kt:22)

Process finished with exit code 1

---

Affects: 5.0.2

Issue Links:

• #20571 Avoid implicit autowiring with Kotlin secondary constructors

Referenced from: commits 19a1477

[spring-projects-issues]

Alexander Chernikov commented

Thank you, works for me in 5.0.3.