I want to write an archunit rule in my J2EE project to test when a class is annotated with @Startup, then it must contain a method that is annotated with @PostConstruct.

I tried this

  @ArchTest
  private val startUpBeansShouldHavePostConstruct: ArchRule = classes().that()
    .areAnnotatedWith(Startup::class.java)
    .shouldHave(methods().that().areAnnotatedWith(PostConstruct::class.java))
    .because("classes with @Startup should contain a @PostConstruct annotated method")

but that doesn’t compile in the shouldHave()-line. I am a bit stuck how to define such a rule. My actual goal is to have a rule that says there should be exactly one annotated method.