When spring-boot-gradle-plugin is using GradleRunner, it needs to be
configured with a custom plugin classpath to account for the fact
that our Gradle plugin is on the classpath of the system classloader
but some of the other plugins would only be available on a
Gradle-created classloader. This imbalance cause class loading
problems as code in spring-boot-gradle-plugin can't see types at
runtime that are only available on the Gradle-created classloader.
To overcome this, we need to configure the GradleRunner with a custom
plugin classpath that contains both spring-boot-gradle-plugin and all
of the other plugins that are used in its various integration tests.
Previously, this was done in GradleBuild that's used by both
spring-boot-gradle-plugin and spring-boot-image-tests. This caused
a problem as spring-boot-image-tests does not have the
above-described problem and trying to correct it did not work leaving
tests that use spring-boot-gradle-plugin unable to see other plugins
such that the native image plugin.
This commit reworks the customization of the plugin classpath so that
it's only done in spring-boot-gradle-plugin's integration tests.
Closes gh-42338
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
