Spring Boot 3 Native Fails to Start with Kotlin @JvmStatic Main Method

Bug Report for Spring Boot 3 Native (GraalVM 22.3) Having a simple Spring Boot application (generated on start.spring.io), changing the main class to:

@SpringBootApplication(proxyBeanMethods = false)
class DemoApplication {
  companion object {
    @JvmStatic
    fun main(args: Array<String>) {
      runApplication<DemoApplication>(*args)
    }
  }
}

And building the native image (via ./gradlew nativeCompile) gives you an executable that fails to start with:

2022-10-29T11:11:27.459+02:00 ERROR 8553 --- [           main] o.s.boot.SpringApplication               : Application run failed

java.lang.IllegalArgumentException: Could not find class [com.example.demo.DemoApplication$Companion__ApplicationContextInitializer]
        at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:333) ~[na:na]
        at org.springframework.context.aot.AotApplicationContextInitializer.instantiateInitializer(AotApplicationContextInitializer.java:80) ~[demo:6.0.0-RC2]
        at org.springframework.context.aot.AotApplicationContextInitializer.initialize(AotApplicationContextInitializer.java:71) ~[demo:6.0.0-RC2]
        at org.springframework.context.aot.AotApplicationContextInitializer.lambda$forInitializerClasses$0(AotApplicationContextInitializer.java:61) ~[demo:6.0.0-RC2]
        at org.springframework.boot.SpringApplication.applyInitializers(SpringApplication.java:603) ~[demo:3.0.0-RC1]
        at org.springframework.boot.SpringApplication.prepareContext(SpringApplication.java:383) ~[demo:3.0.0-RC1]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) ~[demo:3.0.0-RC1]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1302) ~[demo:3.0.0-RC1]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1291) ~[demo:3.0.0-RC1]
        at com.example.demo.DemoApplication$Companion.main(DemoApplication.kt:15) ~[na:na]
        at com.example.demo.DemoApplication.main(DemoApplication.kt) ~[demo:na]
Caused by: java.lang.ClassNotFoundException: com.example.demo.DemoApplication$Companion__ApplicationContextInitializer
        at java.base@19.0.1/java.lang.Class.forName(DynamicHub.java:1132) ~[demo:na]
        at org.springframework.util.ClassUtils.forName(ClassUtils.java:283) ~[na:na]
        at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:323) ~[na:na]
        ... 10 common frames omitted

Let me know if you need more information. Thanks.

[wilkinsona]

The workaround doesn’t work for me since I have to set the main class in bootRun task

This shouldn’t be necessary. bootRun should be automatically configured to use the right main class when using either a companion object or a package-level function.

[akefirad]

Got it. Thanks for the link. 🙏