SpringBoot @ConditionalOnProperty silently ignored on @EventListener

    @EventListener(ApplicationReadyEvent.class)
    @ConditionalOnProperty(havingValue = "true", value = USE_SECOND_LEVEL_CACHE)
    public void someEventHandler() {

Conditional is silently ignored and has no effect.

If it doesn't work with @EventListener, to prevent ambiguous behavior where the code doesn't do what developer hoped it would do, it should throw an erro.

Comment From: wilkinsona

There's no condition evaluation at all on @EventListener methods as conditions are intended for use on @Configuration classes and their @Bean methods to control bean registration. The methods could perhaps be made condition but this would require changes in Spring Framework as it's responsible for @EventListener support and the general condition evaluation framework.

Throwing an error when @ConditionalOnProperty is used incorrectly would require the expense of looking up the conditional annotations that's only of benefit when the annotation has been used incorrectly. It would also set a precedent and lead to an expectation that an error is thrown when an annotation is used incorrectly. I think this would be prohibitively expensive so it isn't something that would should do. Thanks anyway for the suggestion.