Web Async responses force concurrentResult.toString() call [SPR-12253]

[spring-projects-issues]

Ryszard Perkowski opened SPR-12253 and commented

I've been tracking CPU usage of my application and multiple times have I seen in thread dump whole response object string concatenation (toString() method called) taking a lot of CPU.
That string concatenation is forced by using
WebAsyncManager:348
logger.debug("Concurrent result value [" + concurrentResult + "]");

Since it's only for debug it should not be executed for other logging levels.

Pull request provided:
#652

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Affects: 3.2.11, 4.0.7, 4.1 GA

Backported to: 4.0.8, 3.2.12

[spring-projects-issues]

Juergen Hoeller commented

Fixed, and WebAsyncManager also builds correct DeferredResultProcessingInterceptor keys now (derived from interceptor instance instead of array instance).

Juergen