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Ask questionsActuator: NPE in LongTaskTimingHandlerInterceptor

I encountered the following NPE in Spring Boot Actuator 2.1.3.RELEASE:

java.lang.NullPointerException: null
	at org.springframework.boot.actuate.metrics.web.servlet.LongTaskTimingHandlerInterceptor.stopLongTaskTimers(LongTaskTimingHandlerInterceptor.java:123)
	at org.springframework.boot.actuate.metrics.web.servlet.LongTaskTimingHandlerInterceptor.afterCompletion(LongTaskTimingHandlerInterceptor.java:78)
	at org.springframework.web.servlet.HandlerExecutionChain.triggerAfterCompletion(HandlerExecutionChain.java:174)
	at org.springframework.web.servlet.DispatcherServlet.triggerAfterCompletion(DispatcherServlet.java:1424)
…

I believe the assumption is that LongTaskTimingContext#get(HttpServletRequest) never returns null. However, it appears that there can be a case where the request does not contain the required attribute.

I think the code should check for null to be safe.

spring-projects/spring-boot

Answer questions MenschNestor

I can confirm that the issue disappears when I set the unloadDelay to an appropriate value (longer than the sleep in the example). I had previously assumed that the sleep would be interrupted which would have made the request finish as well.

useful!

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