* version-upgrades:
  Upgrade to Logback 1.1.6

Closes gh-5410

Closes gh-5408

Previously, FindMainClassTask would look for a property named main
on any class named run. This was based on the assumption that the
run task would be a JavaExec task (typically provided by the
application plugin). If the run task was not a JavaExec task (more
accurately, if it did not have a main property) this would result in
a build failure due to trying to read a non-existent property.

This commit updates FindMainClassTask to only use the main property
of the run task if the task is a JavaExec task. This guarantees that
the property will exist on the task, and unlike using any property
named main on a task named run, also guarantee that its value will
refer to a Java class with a main method.

Closes gh-5501

This commit fixes `IntegrationAutoConfiguration` to actually rely on the
auto-configured `MBeanServer` rather than attempting to create it again.

If JMX support is disabled, no attempt to register integration-related
MBeans is made.

Closes gh-5309

Add a reference ot underscore notation

Closes gh-5268

Restore Spring Boot 1.3.2 behavior of re-applying system properties
when SLF4J based loggers are re-initialized. Reapplying system
properties is required when using the Spring Cloud config server since
PropertySourceBootstrapConfiguration directly calls the system
initialize method.

Fixes gh-5491

* pr/5489:
  Upgrade Spring AMQP to 1.5.5.RELEASE

Closes gh-5489

Closes gh-5264

This commit prevents the Artemis embedded mode to kick-in if the
`EmbeddedJMS` class it not in the classpath. The previous condition would
match if only `artemis-server` was on the classpath while
`artemis-jms-server` is actually required.

Closes gh-5452

Closes gh-5415

Closes gh-5335

See gh-5335

Previously, only dependency management for logback-classic was
provided. This meant that it was possible for logback-core, upon
which logback-classic depends, to have a different version.

This commit adds dependency management for logback-core, thereby
ensuring that the two dependencies will have the same version.

Closes gh-5304

Shutdown handling has been improved so that it will run after any
EntityManagerFactory beans have been closed. This ensures that Hibernate
can, if configured to do so, drop its schema during restart processing.
Without this change, a benign exception could be logged if the database
was shutdown before Hibernate.

Closes gh-5305

See gh-5258

State is accumulating unnecessarily in AST tranformation instances.
We can fix the ones we have implemented so far just by using a
local variable and passing it into the methods where it is used.
All the methods are private so this change is safe in a point release.

Fixes gh-5283

Previously, Animal Sniffer checking of spring-boot-loader-tools
was disabled as it failed with an NPE. This has been fixed in
Animal Sniffer 1.15.

This commit upgrades Animal Sniffer to 1.15 and adds the necessary
annotations to suppress failures for safe usage of sun.* and Java 7
APIs.

Note that UsesUnsafeJava has been copied from spring-boot and made
package-private. This retains the clearer intent of the custom
annotation (versus @IgnoreJRERequirement) while avoiding the change
in the build order that would be necessary for
spring-boot-loader-tools to use the annotation from spring-boot.

Closes gh-5284

Closes gh-5274

Previously, if DataSourceAutoConfiguration had been explicitly excluded,
DevToolsDataSourceAutoConfiguration would cause refresh to fail due to
a missing DataSourceProperties bean. This commit corrects the condition
so that the auto-configuration is conditional on a DataSource bean and
a DataSourceProperties bean rather than only being conditional on one or
the other.

Closes gh-5269

* gh-5205:
  Fix namespace declarations in Hazelcast xml's and make them consistent

If a JCache provider is started with hazelcast and the default settings,
the underlying `HazelcastInstance` is disposed at the end of the
process, not when the `CacheManager` is closed.

This commit fixes the only test that use such setup.

See also https://github.com/hazelcast/hazelcast/issues/7606

Closes gh-5209

 - Code formatting
 - Javadoc warnings
 - Deprecation warnings

Upgrade to Jetty 9.2.15 and replace use of API that was deprecated
and changed to throw an UnsupportedOperationException in the same
release.

Closes gh-5218

Closes gh-5212

Closes gh-5224

Closes gh-5223

Closes gh-5222

Closes gh-5221

Closes gh-5220