Repeated invocation of AOT phase breaks creation of `application-modules.json`

[Gadnex]

I created a new project with Spring Initializer with Spring Boot 4.0.0-RC2

I am using the following relevant Gradle definition.

plugins {
	id 'org.graalvm.buildtools.native' version '0.11.2'
}

dependencies {
   implementation 'org.springframework.modulith:spring-modulith-starter-core'
   implementation 'org.springframework.boot:spring-boot-starter-actuator'
   runtimeOnly 'org.springframework.modulith:spring-modulith-actuator'
   runtimeOnly 'org.springframework.modulith:spring-modulith-observability'
}

Initially everything starts up and works well.

As soon as I set the Spring Actuator port to a different port my application fails to start up:

management:
  server:
    port: 9080

The error I get is:

Exception in thread "main" org.springframework.beans.factory.aot.AotBeanProcessingException: Error processing bean with name 'childManagementContextInitializer' defined in class path resource [org/springframework/boot/actuate/autoconfigure/web/server/ManagementContextAutoConfiguration$DifferentManagementContextConfiguration.class]: failed to generate code for bean definition
        at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution$BeanDefinitionsRegistrationGenerator.lambda$generateRegisterBeanDefinitionMethods$0(BeanRegistrationsAotContribution.java:280)
        at java.base/java.lang.Iterable.forEach(Iterable.java:75)
        at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution$BeanDefinitionsRegistrationGenerator.generateRegisterBeanDefinitionMethods(BeanRegistrationsAotContribution.java:270)
        at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution$BeanDefinitionsRegistrationGenerator.generateBeanRegistrationsCode(BeanRegistrationsAotContribution.java:238)
        at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution.lambda$generateBeanRegistrationClass$0(BeanRegistrationsAotContribution.java:116)
        at org.springframework.aot.generate.GeneratedMethod.<init>(GeneratedMethod.java:54)
        at org.springframework.aot.generate.GeneratedMethods.add(GeneratedMethods.java:112)
        at org.springframework.aot.generate.GeneratedMethods.add(GeneratedMethods.java:89)
        at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution.generateBeanRegistrationClass(BeanRegistrationsAotContribution.java:110)
        at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution.generateBeanRegistrationCode(BeanRegistrationsAotContribution.java:88)
        at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution.applyTo(BeanRegistrationsAotContribution.java:77)
        at org.springframework.context.aot.BeanFactoryInitializationAotContributions.applyTo(BeanFactoryInitializationAotContributions.java:94)
        at org.springframework.context.aot.ApplicationContextAotGenerator.lambda$processAheadOfTime$0(ApplicationContextAotGenerator.java:59)
        at org.springframework.context.aot.ApplicationContextAotGenerator.withCglibClassHandler(ApplicationContextAotGenerator.java:68)
        at org.springframework.context.aot.ApplicationContextAotGenerator.processAheadOfTime(ApplicationContextAotGenerator.java:54)
        at org.springframework.context.aot.ContextAotProcessor.performAotProcessing(ContextAotProcessor.java:107)
        at org.springframework.context.aot.ContextAotProcessor.doProcess(ContextAotProcessor.java:84)
        at org.springframework.context.aot.ContextAotProcessor.doProcess(ContextAotProcessor.java:49)
        at org.springframework.context.aot.AbstractAotProcessor.process(AbstractAotProcessor.java:84)
        at org.springframework.boot.SpringApplicationAotProcessor.main(SpringApplicationAotProcessor.java:96)
Caused by: java.lang.IllegalStateException: /home/gadnex/Documents/VSCodeProjects/narrator/build/generated/aotResources/META-INF/spring-modulith/application-modules.json already exists
        at org.springframework.aot.generate.GeneratedFiles$FileHandler.create(GeneratedFiles.java:279)
        at org.springframework.aot.generate.GeneratedFiles.lambda$addFile$1(GeneratedFiles.java:170)
        at org.springframework.util.function.ThrowingConsumer.accept(ThrowingConsumer.java:60)
        at org.springframework.util.function.ThrowingConsumer.accept(ThrowingConsumer.java:49)
        at org.springframework.aot.generate.FileSystemGeneratedFiles.handleFile(FileSystemGeneratedFiles.java:90)
        at org.springframework.aot.generate.GeneratedFiles.addFile(GeneratedFiles.java:170)
        at org.springframework.aot.generate.GeneratedFiles.addFile(GeneratedFiles.java:155)
        at org.springframework.aot.generate.GeneratedFiles.addResourceFile(GeneratedFiles.java:109)
        at org.springframework.aot.generate.GeneratedFiles.addResourceFile(GeneratedFiles.java:98)
        at org.springframework.modulith.runtime.autoconfigure.ApplicationModulesFileGeneratingProcessor.lambda$processAheadOfTime$1(ApplicationModulesFileGeneratingProcessor.java:56)
        at org.springframework.context.aot.BeanFactoryInitializationAotContributions.applyTo(BeanFactoryInitializationAotContributions.java:94)
        at org.springframework.context.aot.ApplicationContextAotGenerator.lambda$processAheadOfTime$0(ApplicationContextAotGenerator.java:59)
        at org.springframework.context.aot.ApplicationContextAotGenerator.withCglibClassHandler(ApplicationContextAotGenerator.java:68)
        at org.springframework.context.aot.ApplicationContextAotGenerator.processAheadOfTime(ApplicationContextAotGenerator.java:54)
        at org.springframework.boot.actuate.autoconfigure.web.server.ChildManagementContextInitializer$AotContribution.applyTo(ChildManagementContextInitializer.java:198)
        at org.springframework.beans.factory.aot.BeanDefinitionMethodGenerator.lambda$generateBeanDefinitionMethod$0(BeanDefinitionMethodGenerator.java:165)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1604)
        at org.springframework.beans.factory.aot.BeanDefinitionMethodGenerator.generateBeanDefinitionMethod(BeanDefinitionMethodGenerator.java:165)
        at org.springframework.beans.factory.aot.BeanDefinitionMethodGenerator.generateBeanDefinitionMethod(BeanDefinitionMethodGenerator.java:89)
        at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution$BeanDefinitionsRegistrationGenerator.generateBeanRegistration(BeanRegistrationsAotContribution.java:289)
        at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution$BeanDefinitionsRegistrationGenerator.lambda$generateRegisterBeanDefinitionMethods$0(BeanRegistrationsAotContribution.java:272)
        ... 19 more

I can get things to work if I disable (comment out) the GraalVM native builds, but the following combination of architecture choices are important to me:

• Use Spring Modulith
• Compile to a GraalVM native image
• Use Spring Actuator on a different management port.

[odrotbohm]

Are you sure it's not related to a second execution of the AOT infrastructure? It looks like the Spring AOT's GeneratedFiles but it's not immediately obvious how to check for the presence of a file one would like to add.

[Gadnex]

I am not quite sure how to answer your question about AOT infrastructure as I am not an expert with AOT and GraalVM.

I just wanted to bring it to attention before the Spring Boot 4.0 release that the combination of GraalVM, Spring Actuator and Spring Modulith does not seem to work together if you change the Spring Actuator management port.

If there is indeed a problem and not my own fault, then I am not really sure which of the 3 projects would be the root cause.

If required I could build a quick demo and publish the GitHub URL here.

[odrotbohm]

My point is, and that's more to prevent anyone else stumbling over this ticket, that this doesn't have anything to do with the server port configuration but the fact that a second run of the AOT infrastructure stumbles over the file already created in the first run. I have a local fix available. Snapshots should be available soon.

[odrotbohm]

Snapshots should be available. Please give them a try if you have the time. Thanks for trying the RC before the GA release. Highly appreciated! 🙇

[Gadnex]

Thanks very much for looking into this.

[Gadnex]

I just did a test to create a new project with the Spring Boot 4.0.0 (SNAPSHOT) version.
I am happy to report that this issue is resolved.

[odrotbohm]

Lovely, thanks! We're gonna ship the fix with the GA release on Friday.