8f02e1088d
This commit adds support for the following two JVM system properties that control the Gradle build for alternative JDKs (i.e., a JDK other than the one used to launch the Gradle process). - customJavaHome: absolute path to the alternate JDK installation to use to compile Java code and execute tests. Setting this system property causes Groovy 3.0 RC3 to be used instead of 2.5.x. This system property is also used in spring-oxm.gradle to determine whether JiBX is supported. - customJavaSourceVersion: Java version supplied to the `--release` command line flag to control the Java source and target compatibility version. Supported versions include 9 or higher. Do not set this system property if Java 8 should be used. Examples: ./gradlew -DcustomJavaHome=/opt/java/jdk-14 test ./gradlew --no-build-cache -DcustomJavaHome=/opt/java/jdk-14 test ./gradlew -DcustomJavaHome=/opt/java/jdk-14 -DcustomJavaSourceVersion=14 test See gh-24474
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