Platforms affected

Linux and Windows

Motivation and Context

Starting with Java 9 the JRE and JDK no longer include tools.jar as described in JEP 220. As a result the check_java function is unable to detect a Java 11 installation unless the JAVA_HOME environment variable is set manually:

The check for tools.jar appears to have been added in commit 7133576.

Description

This change instead checks for the presence of ${maybeJavaHome}/bin/java or ${maybeJavaHome}/bin/java.exe. This is similar to the checks performed by gradlew and gradlew.bat.

Testing

On Debian 11:

$ readlink -f $(which javac)
/usr/lib/jvm/java-11-openjdk-amd64/bin/javac
$ ls /usr/lib/jvm/java-11-openjdk-amd64/lib/tools.jar
ls: cannot access '/usr/lib/jvm/java-11-openjdk-amd64/lib/tools.jar': No such file or directory
$ ls /usr/lib/jvm/java-11-openjdk-amd64/bin/java
/usr/lib/jvm/java-11-openjdk-amd64/bin/java

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary