docs: public void setBootClassPath(Collection<File> bootClasspath) {
  		final JavaVersion version = JavaVersion.fromQualifier(getJavaSourceVersion());
  		if (version.isAtLeast(JavaVersion.JAVA9)) {
  			reportInternalWarning(MessageFormat.format(Messages.SarlBatchCompiler_63,
  					Joiner.on(File.pathSeparator).join(bootClasspath)));
  		}
  		if (bootClasspath == null || bootClasspath.isEmpty()) {
  			this.bootClasspath = null;
  		} else {
  			this.bootClasspath = new ArrayList<>(bootClasspath);
  		}
  	}