Issue: SPR-11737
(cherry picked from commit 93d13cfc)
(cherry picked from commit 4196e6c9)

Issue: SPR-11702

Issue: SPR-11635

Improved the SAX to StAX (and vice-versa) bridge exposed via StaxUtils.
The old integration had some issues with namespace declaration
attributes, brought to light in a XMLUnit upgrade.

Issue: SPR-11549

Update OXM AbstractMarshaller to support processing of external
XML entities. By default external entities will not be processed.

Issue: SPR-11376

Corrected documentation regarding the CatchAllConverter in the XStream
javadocs.

XStream 1.4.5 doesn't check a given ConverterLookup for a ConverterRegistry implementation anymore, so we have to manually perform that check and assignment.

Issue: SPR-11147

Fix a variety of typos throughout the project, primarily in
comments (javadoc or otherwise) but also in a handful of log messages
and a couple exception messages.

ISSUE: SPR-11123

Fix remaining Java compiler warnings, mainly around missing
generics or deprecated code.

Also add the `-Werror` compiler option to ensure that any future
warnings will fail the build.

Issue: SPR-11064

Added reference to CatchAllConverter in both javadoc and reference docs.

Issue: SPR-10821

Also splitted buildXStream into constructXStream and configureXStream now.

Issue: SPR-10421

Issue: SPR-10421

Issue: SPR-10421

Also introducing a "mapper" bean property and applying the stream driver and the class loader to the native XStream delegate now.

Issue: SPR-10421

Issue: SPR-10130

This reverts commit 45fa5082, reversing
changes made to a312d900.

Issue: SPR-10130

Issue: SPR-10128

Issue: SPR-10127

XStreamMarshaller now supports writing to OutputStreams and reading from
InputStreams directly, as opposed to wrapping streams in a
OutputStreamWriter or InputStreamReader.

Issue: SPR-9663

Issue: SPR-9536

Issue: SPR-9536

XStreamMarshaller should convert XStream StreamException to Spring
exception in case of unmarshalling an empty stream.

Issue: SPR-9536

This renaming more intuitively expresses the relationship between
subprojects and the JAR artifacts they produce.

Tracking history across these renames is possible, but it requires
use of the --follow flag to `git log`, for example

    $ git log spring-aop/src/main/java/org/springframework/aop/Advisor.java

will show history up until the renaming event, where

    $ git log --follow spring-aop/src/main/java/org/springframework/aop/Advisor.java

will show history for all changes to the file, before and after the
renaming.

See http://chrisbeams.com/git-diff-across-renamed-directories

SPR-7636 - XStreamMarshaller - Add support for configuring XStream with aliases by class (type) and also defining multiple attributes for the same class.

SPR-6939 - XStreamMarshaller + JsonHierarchicalStreamDriver + JsonWriter.DROP_ROOT_MODE produce empty output