Setting `options.fork = true` causes the classpath in the forked
compiler process to include Class-Path entries from MANIFEST.MF files
in JARs in the classpath, which results in warnings about missing
classpath entries.
This commit removes the `options.fork = true` declaration and further
simplifies the script.
See gh-24474
Prior to this commit, the "-Werror" was removed as a command-line
argument in order not to fail the build for missing classpath elements.
This commit reinstates "-Werror" and removes "-Xlink:path" in order to
explicitly ignore warnings for missing classpath elements when executing
the build with a custom JAVA_HOME.
See gh-24474
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
Sam Brannen