* Configures JVM options for comprehensive GC logging with rotation.
     *
     * @return this ExecJob instance for method chaining
     */
    public ExecJob gcLogging() {
        final StringBuilder buf = new StringBuilder(100);
        buf.append("-Xlog:gc*,gc+age=trace,safepoint:file=");
        if (logFilePath != null) {
            buf.append(logFilePath);
        } else {