[CAMEL-8906] Application hangs when Spring Boot Actuator shutdown hook is used

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.15.2
• Fix Version/s: 2.15.3, 2.16.0
• Component/s: camel-spring-boot
• Estimated Complexity: Unknown
• Assignee: Claus Ibsen
• Reporter: Miroslav Matejovsky
• Created: 26/Jun/15 05:46
• Updated: 12/Jul/15 11:09
• Resolved: 01/Jul/15 08:04

Description

After some investigation:

• org.apache.camel.spring.boot.CamelSpringBootApplicationController creates org.apache.camel.main.MainSupport instance
• MainSupport.waitUntilCompleted() will hang on latch.await()
• To release this lock MainSupport.completed() has to be called. But this never happens
• CamelSpringBootApplicationController should implement @PreDestroy callback and call mainSupport.completed()
• Workaround:

    @Autowired
    private CamelSpringBootApplicationController camelSpringBootApplicationController;
  
    @PreDestroy
    public void preDestroy() throws Exception {
      final Field f = camelSpringBootApplicationController.getClass().getDeclaredField("mainSupport");
      f.setAccessible(true);
      MainSupport mainSupport = (MainSupport) f.get(camelSpringBootApplicationController);
      mainSupport.completed();
    }