CODEWITHSUNDEEP
spring-cloud-stream
wabrit
wabrit

Reputation: 265

When is it safe to send a message via Spring Cloud Stream on application startup?

I have a Spring Boot application which has a bean that needs to send a message (using Spring Cloud Stream) once on startup.

Sending direct from a @PostConstruct bean method does not work because by that stage it appears that the messaging system is not fully initialised, and an exception results.

I can overcome this using a scheduled task launched from a @PostConstruct method with a sufficiently long delay, but the key is what constitutes "sufficiently long"; is there an initialisation event published by Spring Cloud Stream that I can listen for which effectively tells me "it's now safe to send a message"?

Failing that, is there a more robust way to handle this than guessing how long the delay should be?

Upvotes: 0

Views: 140

Answers (1)

Gary Russell
Gary Russell

Reputation: 174719

You should never perform "active" operations from a @PostConstruct method; it's too early in the application context's lifecycle.

Implement SmartLifecycle, put your bean in a high Phase (e.g. Integer.MAX_VALUE) and it will be start()ed last.

Put your code in the start() method.

Upvotes: 2

Related Questions