Close processing triggered by shutdown hook isn't thread safe [SPR-13556]

[spring-projects-issues]

Andy Wilkinson opened SPR-13556 and commented

In AbstractApplicationContext, refresh and close both synchronize on startupShutdownMonitor to prevent concurrent processing. However, when the application context's shutdown hook is performing the close processing this doesn't hold true as it doesn't synchronise on startupShutdownMonitor. This means it's possible for two close calls or a close and a refresh to occur in parallel.

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Affects: 4.1.7

Reference URL: spring-projects/spring-boot#4130

Issue Links:

• ClasspathXmlApplicationContext cannot be closed twice [SPR-13425] #18004 ClasspathXmlApplicationContext cannot be closed twice

Referenced from: commits 92dc51f, 57125c0

Backported to: 4.1.8