The command javac -version prints result to stderr when JAVA 8 is used and to stdout when JAVA 9 is used. Current check in CLI uses the stderr output, so when JAVA 9 is installed it fails to detect the correct version.
In order to support both JAVA 8 and JAVA 9, capture both stdout and stderr and get the version from there.
Also remove unneeded check for Java version - we care about JAVA Compiler, which is included in JDK.
The command
javac -versionprints result to stderr when JAVA 8 is used and to stdout when JAVA 9 is used. Current check in CLI uses the stderr output, so when JAVA 9 is installed it fails to detect the correct version. In order to support both JAVA 8 and JAVA 9, capture both stdout and stderr and get the version from there. Also remove unneeded check for Java version - we care about JAVA Compiler, which is included in JDK.