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spring-kafka

SPEL expression in @EventListener

The below code sample is taken from Spring documentation. My question is how to pass a variable in place of 'qux-'. I tried #{}, ${}.

@EventListener(condition = "event.listenerId.startsWith('qux-')")
    public void eventHandler(ListenerContainerIdleEvent event) {
        ...
    }
Solution

  • It can be done, but indirectly...

    @Bean
String prefix(@Value("${foo:qux-}") String foo) {
    return foo;
}

    and

    @EventListener(condition = "event.listenerId.startsWith(@prefix)")

    It will use qux- if there is no property foo.