Add IPv6 support in RestTemplate

Prior to this commit, RestTemplate would not would
not accept IPv6 raw addresses in URLs because UriComponentsBuilder
would not parse/encode the Host part correctly.

The UriComponentsBuilder now parses and encode raw IPv6 addresses
in the "[1abc:2abc:3abc::5ABC:6abc]" format and also supports the
use of IPv6 scope_ids (see JDK8 java.net.Inet6Address),
like "[1abc:2abc:3abc::5ABC:6abc%eth0]".

Issue: SPR-10539
Polish

Issue: SPR-10539
Merge pull request #358 from bclozel/SPR-10539

* bclozel-SPR-10539:
  Polish
  Add IPv6 support in RestTemplate
Add NoHandlerFoundException to DispatcherServlet

Prior to this commit, the DispatcherServlet would send an error
response using the HttpServlet API when no Handler was found to
handle this request.

Now the DispatcherServlet can be configured to throw a
NoHandlerFoundException, when the throwExceptionIfNoHandlerFound
property is set to "true".
Those exceptions can be later on caught by default or custom
HandlerExceptionResolvers/ExceptionHandlers.

Issue: SPR-10481
Merge pull request #359 from bclozel/SPR-10481

* bclozel-SPR-10481:
  Add NoHandlerFoundException to DispatcherServlet
Fixed URLs in import-into-eclipse scripts
Merge pull request #363 from mikesir87/STS-url-fix

Fixed URLs in import-into-eclipse scripts
Enable cookie_needed by default in SockJS service

Issue: SPR-10939
After-returning advice strictly follows AspectJ's rules for return value matching

Issue: SPR-10834
Silently swallow IllegalStateException on commit if the JMS transaction is based on a JDBC transaction

This fine-tuned change restores the original Spring 3.0 behavior for Oracle AQ, and also allows for other ConnectionFactory types to comply with the "getDataSource()" pattern.

Issue: SPR-10829
Added ASPECTJ and REGEX constants to FilterType, along with a corresponding 'pattern' attribute on ComponentScan.Filter

Issue: SPR-10593
Add StompCodec

Previously, the broker relay's TCP client used Reactor's built in
delimited codec as part of its parsing of STOMP frames. \0 was used as
the delimiter. This worked for most STOMP frames but, crucially,
not for frames with a body that contained \0: when such a frame was
received it would be truncated.

This commit adds a custom codec that parses STOMP frames more
intelligently. It honours the content-length header allowing it to
correctly parse frames with a body that contains \0. The codec largely
delegates to two new classes: StompEncoder and StompDecoder. For
consistency, code that previously used StompMessageConverter has been
reworked to use these new encoder and decoder classes.

Issue: SPR-10818
Remove CONNECT-related message buffer from STOMP relay

Before this change, the StompProtocolHandler always responded to
clients with a CONNECTED frame, while the STOMP broker relay
independantly forwarded the client CONNECT to the broker and waited
for the CONNECTED frame back. That meant the relay had to buffer
client messages until it received the CONNECTED response from
the message broker.

This change ensures that clients wait for a CONNECTED frame from
the message broker. The broker relay forwards the CONNECT frame to
the broker. The broker responds with a CONNECTED frame, which the
relay then forwards to the client. As a result, a (well-written)
client will not send any messages to the relay until the connection
to the broker is fully established.

The StompProtcolHandler can now be configured whether to send CONNECTED
frame back. By default that is off. So when using the simple broker,
the StompProtocolHandler can still respond with CONNECTED frames.

The relay's handling of a connection being dropped has also been
improved. When a connection for a client relay session is dropped
an ERROR frame will be sent back to the client. If a connection is
closed as part of a DISCONNECT frame being sent, no ERROR frame
is sent back to the client. When the connection for the system relay
session is dropped, an event is published indicating that the broker
is unavailable. Reactor's TcpClient will then attempt to re-restablish
the connection.
Add heart-beat support to STOMP broker relay

Previously, the STOMP broker relay did not support heart-beats. It sent
0,0 in the heart-beats header for its own CONNECTED message, and set the
heart-beats header to 0,0 when it was forwarding a CONNECTED from from a
client to the broker.

The broker relay now supports heart-beats for the system relay session.
It will send heart-beats at the send interval that's been negotiated
with the broker and will also expect to receive heart-beats at the
receive interval that's been negotiated with the broker. The receive
interval is multiplied by a factor of three to satisfy the STOMP spec's
suggestion of lenience and ActiveMQ 5.8.0's heart-beat behaviour (see
AMQ-4710).

The broker relay also supports heart-beats between clients and the
broker. For any given client's relay session, any heart-beats received
from the client are forwarded on to the broker and any heart-beats
received from the broker are sent back to the client.

Internally, a heart-beat is represented as a Message with a byte array
payload containing the single byte of new line ('\n') character and
'empty' headers. SubscriptionMethodReturnValueHandler has been updated
to default the message type to SimpMessageType.MESSAGE. This eases
the distinction between a heartbeat and a message that's been created
from a return value from application code.
Upgrade to Reactor 1.0.0.M3
Improve handling of missed heartbeats

Previously, when a broker heartbeat was mnissed, the STOMP connection
would be left in a semi-disconnected state such that, for example, the
read and write idle callbacks would still be active, even though
the underlying TCP connection had been nulled out.

As part of disconnecting the STOMP connection, this commit closes the
underlying TCP connection when a heartbeat's missed which cancels the
read and write idle callbacks. It also now copes with the underlying
TCP connection being null when sending a heartbeat to the broker. This
protects again a race condition between the write idle callback being
fired, such that a heartbeat needs to be sent, and the connection
being nulled out due to it being closed.
Polish
Merge multiple pull requests from wilkinsona

* broker-relay:
  Polish
  Improve handling of missed heartbeats
  Upgrade to Reactor 1.0.0.M3
  Add heart-beat support to STOMP broker relay
  Remove CONNECT-related message buffer from STOMP relay
  Add StompCodec
Remove unused snapshot repository definition
Polish logging