Check that Java is available on the system PATH

Verifies that a java executable can be located and invoked from the system shell, by running java -version and checking both that the call succeeds and that it returns a zero exit status.

Usage

check_java()

Value

Invisibly returns TRUE if Java is available and callable; otherwise throws an error, including the captured command output and exit status (if any) for debugging.

Author

Ahmed El-Gabbas

Examples

if (FALSE) { # \dontrun{
  check_java()
} # }