Closes gh-1748
Closes gh-1703

Closes gh-1708

Closes gh-1742

Rework @TestPropertySource changes introduced in commit d251b513
to restore compatibility with Spring Boot 1.1

- Only add the `server.port` property when no @IntegrationTest
  annotation is found.
- Always add a default `spring.jmx.enabled=false` property.
- Restore the SpringApplicationContextLoader.getEnvironmentProperties
  protected method.
- Remove the @IntegrationTest.properties attribute.

See gh-1697

Previously, the regular jms connection factory was always overriding
the xaConnectionFactory when using ActiveMQ. While
ActiveMQAutoConfiguration is namely shielded with a condition on a
missing ConnectionFactory bean, said configuration class also imports the
XA and regular configuration classes that both can create the connection
factory.

This commit adds a ConditionalOnMissingBean in the second class that is
imported in case the XA configuration has already defined what it needs.

Fixes gh-1727

Closes gh-1740

Previously, Log4J2LoggingSystem did not install SLF4JBridgeHandler.
SLF4JBridgeHandler is used to route logging calls made using
java.util.logging into SLF4J. This resulted in entries being written
to System.err instead.

This commit updates Log4J2LoggingSystem to register the bridge handler
thereby ensuring the logging that originates into java.util.logging is
routed into SLF4J. This change has been made by extracting a new
abstract superclass that performs the registration. This super class is
extended by all SLF4J-based LoggingSystem implementations.

Fixes gh-1737

Previously, there was a timing window where the output file had been
created but it was empty. This would cause the test to fail as the
output was read from the empty file and didn’t match the expected “Hello
World”.

This commit updates the test to only process the resources in the output
directory when all the resolved resources have a non-zero content
length. An @Before method has also been added to delete the output
produced by the test so that the outcome of the test isn’t affected by
files generated by previous runs.

Fixes gh-1735

This is a follow-on from the changes made in 2b7bf3e7. In addition to the
problematic use of @ConditionalOnClass that was addressed in 2b7bf3e7,
JerseyAutoConfiguration also used @ConditionalOnBean referencing a 
Jersey class. This has the same problem when used on a class that
implements WebApplicationInitializer. Implementing
WebApplicationInitializer causes the class’s annotations to be
introspected during servlet container initialiser processing. If a
@ConditionalOnBean annotation references a Class that cannot be
loaded an ArrayStoreException occurs.

This commit updates JerseyAutoConfiguration to reference ResourceConfig
as a String. This allows it annotations to be introspected without
attempting to load a Jersey class that may not be on the classpath.

Fixes gh-1733
Fixes gh-1719

For those running applications on Java 8, dependency management for the
Java 8-compatible artifact is also provided.

Closes gh-1721

Previously, Bitronix's server ID was hard-coded to be
spring-boot-jta-bitronix. This created the possibility of multiple
transaction managers performing recovery on each other's behalf as
they would be unable to identify their own XIDs due to the common
server ID.

This commit reinstates the default (which is the IP address of the
machine on which Bitronix is running), and introduces a new
property, spring.jta.transaction-manager-id, that can be used to
configure the id for both Atomikos and Bitronix. A cautionary note
has also been added to the documentation for Atomikos and Bitronix
explaining the need to configure this property.

Closes gh-1548

Spring 4.2 has a @TestPropertySource which has some of the features of
@IntegrationTest. This change adds @TestPropertySource to the @IntegrationTest
annotation, so that (for instance) the cache key for the context includes
properties for the test.

Since @IntegrationTest has slightly different semantics I do not propose to
deprecate it. Users can use it or @TestPropertySource, the main difference being that
with @IntegrationTest the Spring Boot context loader is aware of the annotation
and it will set sensible defaults for server.port and spring.jmx.enabled.

There are some reflection hacks to overcome the usual fortifications of Spring Test.

Fixes gh-1697

Closes gh-1698

Spring 4.1 has added support for XML HTTP message conversion using
Jackson. This was resulting in the response being sent back as XML
rather than JSON. Jackson's XML support doesn't cope well with lists
when it's being asked to deserialize to a Map [1] which is what the
test was doing.

This commit updates the test to indicate that it only accepts
application/json, thereby ensuring that the response can be correctly
deserialized into a Map.

Fixes gh-1715

[1] https://github.com/FasterXML/jackson-dataformat-xml/issues/122

Maven is configured to run tests found in classes ending in Tests.
This meant that the tests in BasicErrorControllerIntegrationTest (note
the missing s) were not being run.

This commit renames the test class so that it's picked up by Maven.

Closes gh-1710

This reverts commit 26a528ce.

Fixes gh-1706

Previously, the CLI did not keep track of a dependency's users. This
meant that installing two extensions with a common dependency and
then unistalling one extension would break the other extension as the
common dependency would be deleted:

 1. Install a that depends on c
 2. Install b that depends on c
 3. Uninstall b
 4. a is now broken as c has been deleted

This commit updates the CLI to maintain a count for each artifact
that's installed into /lib. An artifact is now only deleted when the
count reaches zero.

As part of this change the code has been
extensively refactored to bring the structure into line with other CLI
commands and to improve testability.

Closes gh-1410

Closes gh-1506

Closes gh-1704

Closes gh-1699

Fixes gh-1701

I think this fixes gh-446 (it seems unreasonable to want to log the DDL
even if it is not being executed)

Fixes gh-1693

Previously, Spring Data’s web support was auto-configured as part of the
JPA repositories auto-configuration. However, Spring Data’s web support
isn’t dependent on the use of Spring Data JPA or even repositories.

This commit moves the auto-configuration into a standalone class, making
it independent of the use of Spring Data JPA and Spring Data
repositories.

Closes gh-1097