This reverts commit d6df4a6577 because running
gradle generatePomFileForMavenJavaPublication throws a
kotlin.KotlinNullPointerException error with Kotlin 1.5.20.
Revert Mockito upgrade done in 5d919dc094 because
Byte Buddy transitive upgrade from 1.11.1 to 1.11.3 seems to break Mockk tests
with java.security.AccessControlException related errors, so probably
better to wait Mockito using Byte buddy 1.11.5+ which seems to refine
this area, see https://github.com/raphw/byte-buddy/releases/tag/byte-buddy-1.11.5.
This commit fixes various issues with the configuration of the Gradle
Java toolchain in the build.
First, the configuration of build properties is fixed in the CI pipeline
because it wasn't properly checked.
The JMH plugin is also upgraded and we now configure its toolchain
support.
This commit also rewrites the XJC tasks in the spring-oxm module,
leveraging a Gradle plugin that creates actual compile tasks we can
configure.
See gh-25787
Prior to this commit, the Spring Framework build would rely on
setting a custom Java HOME for building all sources and tests
with that JDK.
This approach is not flexible enough, since we would be testing
the source compatibility against a recent JDK, but not a common
case experienced by the community: compiling and running
application code with a recent JDK and the official, JDK8-based
Framework artifacts.
This method is also limiting our choice of JDKs to the ones
currently supported by Gradle itself.
This commit introduces the support of Gradle JVM Toolchains in
the Spring Framework build.
We can now select a specific JDK for compiling the main
SourceSets (Java, Groovy and Kotlin) and another one for
compiling and running the test SourceSets:
`./gradlew check -PmainToolChain=8 -PtestToolchain=15`
Gradle will automatically find the JDKs present on the host or
download one automcatically. You can find out about the ones
installed on your host using:
`./gradlew -q javaToolchains`
Finally, this commit also refactors the CI infrastructure to:
* only have a single CI image (with all the supported JDKs)
* use this new feature to compile with JDK8 but test it
against JDK11 and JDK15.
Closes gh-25787
Stephane Nicoll
Juergen Hoeller
Sébastien Deleuze
Rossen Stoyanchev
Sam Brannen
Brian Clozel