Spring ShallowEtagHeaderFilter failes on EAP 7

Issue

• Spring ShallowEtagHeaderFilter is failing when used with async controllers and undertow. The reason is that it assumes that the servlet container uses ServletResponse form AsyncContext for subsequent async processing. The following exception is seen:

ERROR [io.undertow.request] (default task-1) UT005023: Exception handling request to /springApp: java.lang.IllegalArgumentException: ContentCachingResponseWrapper not found
    at org.springframework.util.Assert.notNull(Assert.java:198)
    at org.springframework.web.filter.ShallowEtagHeaderFilter.updateResponse(ShallowEtagHeaderFilter.java:119)
    at org.springframework.web.filter.ShallowEtagHeaderFilter.doFilterInternal(ShallowEtagHeaderFilter.java:112)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)