Previously, a JVM that was forked by spring-boot:run could be orphaned
when the parent process (the Maven build) was terminated in an IDE. Note
that this doesn’t happen when spring-boot:run is invoked from a shell.

This commits add a shutdown hook that registered when RunMojo forks the
JVM. The shutdown hook attempts to kill the forked JVM’s RunProcess
rather than relying on the death of the parent process being sufficient
to also kill the child.

Closes gh-5815

Make RunProcessKiller final

This commit streamlines the Integration Starter by removing the file
http, ip, and stream modules as they are not always used by a majority
of apps that use Spring Integration and can also pull in other, unwanted
dependencies.

Additionally, a dependency on spring-integration-java-dsl has been
added. This makes it easy for users to configure Spring Integration
using Java configuration (the recommended approach), rather than via
XML. The Integration sample has been updated to use the DSL. Further
improvements could be made once the sample is using Java 8.

Closes gh-5528

See gh-5528

Closes gh-5727

* pr/5727:
  Replacing StringBuffer with lock-free StringBuilder

Closes gh-5731

* pr/5731:
  Remove duplicate words

Closes gh-5722

Closes gh-5725

…runs

Previously, SpringBootContextLoader configured the environment with the
test property sources using an ApplicationContextInitializer. This was
because TestPropertySourceUtils did not provide a method to directly
configure the environment using properties files, it had to be done
via an application context. An unwanted side-effect of this was that
the test property sources were not being configured before
ConfigFileApplicationListener examined the environment to determine the
name and locations of the files that it should be loading.

This commit takes advantage of a new method that was added to
TestPropertySourceUtils which allows properties files to be added
directly to the environment without using an application context. This
means that the use of the ApplicationContextInitializer can be removed
and the test property sources can be applied to the environment before
the application context is created.

Closes gh-5728

Previously, the classpath would be logged in response to the
ApplicationStartedEvent. At this point, logging could be disabled
while the logging system is being initialized, or because the
log levels configured in the environment have not yet been applied.

This commit moves the logging to happen in response to an
ApplicationEnvironmentPreparedEvent by which point the logging
system has been initialized and its levels have been configured.

Closes gh-5313

Closes gh-5720

* pr/5720:
  Remove the second parameter of substring() if possible

Closes gh-2953

Closes gh-5738

Closes gh-5351

Closes gh-5741

Previously, the Gradle plugin would include all of the dependencies
from both the compile and runtime configurations in the repackaged
jar. In the unlikely event that the compile and runtime configurations
contained different versions of the same dependency, this would lead
to both versions of the dependency being packaged in the jar file.

The runtime configuration extends the compile configuration so, in
normal circumstances, it will contain a superset of the compile
configuration's dependencies. In the situation described above where
the two configurations contain different versions of the same
dependency the runtime configuration will only contain whichever
version of the two dependencies has "won". By default, this will
be the dependency with the higher version.

This commit updates the Gradle plugin to only include the runtime
configuration's resolved dependencies during repackaging. As explained
above, the runtime configuration extends the compile configuration so
any compile dependencies will still be included, with the added
benefit that duplicate versions of the same dependency will have been
resolved to a single, preferred version.

Closes gh-5749

See gh-4953
Closes gh-5745

This commit validates that a `SessionRepository` has been configured if
Spring Boot is meant to auto-configure one.

Closes gh-5943

Closes gh-5940

Closes gh-5950

Closes gh-5951

Closes gh-5952

Closes gh-5953

Closes gh-5955

Closes gh-5957

Closes gh-5958

Closes gh-5959

Closes gh-5960

Closes gh-5961

Closes gh-5962

Closes gh-5963

Closes gh-5964

Closes gh-1440

Closes gh-5965

This commit removes the creation of a `@Primary` `OAuth2RestTemplate`
and updates the documentation accordingly.

Once #5507 is implemented we could revisit this area to provide a way for
users to easily create such a bean.

Closes gh-5202

Closes gh-5934

Closes gh-5883

The `if` in registerSpies() is not required as it's covered by the
Assert check.

Closes gh-5889

Fixes gh-5933

Deprecate `PropertiesConfigurationFactory.setProperties()` since it was
only being used in tests.

Fixes gh-5930

Improve the message thrown when a @PropertyMapping is used in
combination with a @component to include the actual annotations that
are causing the problem.

Fixes gh-5897