Fix Issue #362 - Improved Spring Boot Support

[lincolnthree]

This is a re-opened PR continued from #368 which was targeted at the now defunct develop branch.

[lincolnthree]

Link with #362

[larsgrefer]

This would also remove the servlet context registered by contextInitialized, wouldn't it?

[larsgrefer]

I think the RequestListener part is not necessary.

Spring already has an org.springframework.web.context.request.RequestContextListener and org.springframework.web.filter.RequestContextFilter which both catch the current request in a ThreadLocal which can be accessed as follows:

HttpServletRequest request = (HttpServletRequest) RequestContextHolder.currentRequestAttributes().resolveReference("request");

From there you could simply use this to get the ApplicationContext:

RequestContextUtils.findWebApplicationContext(request);

[lincolnthree]

Merged into all relevant branches! Thanks everyone for your patience.