Issue: SPR-14946

Issue: SPR-14940

Issue: SPR-15009

(cherry picked from commit 154ef8bf)

Issue: SPR-15019
(cherry picked from commit 97ea22cb)

Issue: SPR-14931
(cherry picked from commit f6b2a212)

Issue: SPR-15031
(cherry picked from commit 9c55d22f)

Issue: SPR-14857

Issue: SPR-15018

Issue: SPR-15009

Includes consistent use of ResolvableType.resolve() wherever applicable.

Issue: SPR-15011
(cherry picked from commit 4c005e63)

Issue: SPR-14978
(cherry picked from commit 37c734ec)

Issue: SPR-15017
(cherry picked from commit 23f04183)

Issue: SPR-15019
(cherry picked from commit 3370f41c)

Issue: SPR-15015
(cherry picked from commit 29543856)

Issue: SPR-15010
(cherry picked from commit 6d1cae2f)

Issue: SPR-15007
(cherry picked from commit eeb7ae53)

Issue: SPR-14971
(cherry picked from commit aef1460a)

Issue: SPR-15005
(cherry picked from commit 8b5ee4ef)

This commit also migrates from a WeakHashMap to a ConcurrentReferenceHashMap, allowing for concurrent access to existing cache entries.

Issue: SPR-15006
(cherry picked from commit b825528d)

Issue: SPR-14996
(cherry picked from commit 547b9638)

CommonsMultipartFile.getOriginalFilename() can be configured to preserve header-specified filename as-is

Issue: SPR-14613
(cherry picked from commit aa29495d)

Issue: SPR-14940
(cherry picked from commit 52799c0e)

Issue: SPR-14994
(cherry picked from commit 953bc189)

Issue:  SPR-14986
(cherry picked from commit 7714eecc)

Issue: SPR-14972
(cherry picked from commit a7ec6dc0)

Issue: SPR-14990
(cherry picked from commit 278a6250)

Issue: SPR-14985
(cherry picked from commit ee30ce95)

Issue: SPR-14976
(cherry picked from commit 8ab977e7)

Issue: SPR-14957
(cherry picked from commit 2f80b848)

Issue: SPR-14361
Issue: SPR-14987
(cherry picked from commit 05579fd1)

Issue: SPR-14969
(cherry picked from commit 6517c537)

Previously ForwrdedHeaderFilter did not ensure that
HttpServletResponse.sendRedirect worked properly based on
X-Forwarded-* headers.

This commit updates ForwardedHeaderFilter to overrided the
HttpServletResponse.sendRedirect method to ensure
X-Forwarded-* headers are honored.

Issue SPR-15020

This commit makes it possible for a ChannelInterceptor to override the
user header in a Spring Message that contains a STOMP CONNECT frame.

After the message is sent, the updated user header is observed and
saved to be associated with session thereafter.

Issue: SPR-14690