Previously, the optional configuration was added to the compile and
runtime classpaths of each source set and the the javadoc classpath
as well. This had a few disadvantages, the most notable of which is
that it meant that the configuration was ifrst resolved and then
the outcome of the resolution was added to the compile and runtime
classpaths. As a result, none of the attributes on the compile and
runtime classpaths were considered to influence variant selection.
This commit reworks the optional dependencies plugin so that the
compile and runtime classpaths of each source set are now configured
to extend from the optional configuration. This allows each
classpath configuration's attributes to influence the dependencies
that are selected from the optional configuration during resolution.
For example, when resolving the compile classpath, compile
dependencies (Usage.JAVA_API) will be selected and when resolving the
runtime classpath, runtime dependencies (Usage.JAVA_RUNTIME) will be
selected.
The above-described change means that runtime dependencies of an
optional dependencies will no longer leak into the compile classpath.
As a result of this, our Gradle plugin's test infrastructure has
been updated so that it no longer references runtime dependencies of
the Kotlin Gradle plugin at compile time.
Closes gh-27965
A new system test plugin is being made available for running test
suites that should be run less frequently than with every commit, such
as tests that verify Spring Boot compatibility with external
projects. CI pipeline configuration for running system tests is also
provided.
The first system tests verify the behavior of the Spring Boot image
building plugins when building images using Paketo buildpacks.
Closes gh-25824
Previously, our conventions configured the source and target
compatibility on the project's JavaCompile tasks. This causes the
settings to be missed when importing the projects into Eclipse [1].
This commit updates the conventions to set the source and target
compatibility on the project-wide JavaPluginExtension. This allows
the Eclipse import to correctly detect and honour the settings.
Closes gh-26932
[1] https://github.com/eclipse/buildship/issues/978
While we're building with Gradle 6.9 at the moment and ConfigureUtil
has only been deprecated in Gradle 7.1, it doesn't do any harm to
stop using it now.
Closes gh-26928
