Avoid reflection for creating StandardServletAsyncWebRequest [SPR-13112]

[spring-projects-issues]

Juergen Hoeller opened SPR-13112 and commented

WebAsyncUtils uses reflection to create a StandardServletAsyncWebRequest, trying to avoid a Servlet 3.0 API dependency, despite an inner class delegate approach working equally well. Let's avoid the reflection overhead if we can, since we're doing this per (asynchronous) request.

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Affects: 4.1.6, 4.2 RC1