Java : Checking if environment variables are valid

Has a few problems with environment variables and I couldn't find a utility that would check them for me e.g. checking if all the entries in my PATH environment variable were valid.

So I rolled my own:

public class CheckEnv {

    /**
     * @param args the command line arguments
     */
    static String envVar = "";
    static String envValue = "";
    static String envValueStrings[];
    static String envValueString = "";
    static boolean valid = false;

    public static void main(String[] args) {
        // TODO code application logic here

        if (args.length < 1) {
            System.out.println("\nUsage is 'java -jar CheckEnv.jar '");
            System.out.println();
            System.out.println("   e.g.  'java -jar CheckEnv.jar PATH'");
            System.out.println("         'java -jar CheckEnv.jar CLASSPATH'");
            System.out.println("         'java -jar CheckEnv.jar INCLUDE'");
            System.out.println("         'java -jar CheckEnv.jar LIB'");
            System.exit(1);
        }

        envVar = args[0];

        envValue = System.getenv(envVar);

        System.out.println ("\nChecking for environment variable " + envVar + "\n");

        if (envValue == null)
        {
            System.out.println ("Environment variable " + envVar + " doesn't exist");
            System.exit(1);
        }

        envValueStrings = envValue.split(";");

        for (int i = 0; i < envValueStrings.length; i++) {
            envValueString = envValueStrings[i];

            System.out.print("Checking " + envValueString + " ");

            File file = new File(envValueString);
            valid = file.exists();

            if (valid) {
                System.out.println("- variable exists");
            } else {
                System.out.println("- variable does not exist : WARNING");
            }

        }
    }
}

Usage is 'java -jar CheckEnv.jar '

e.g. 'java -jar CheckEnv.jar PATH'
'java -jar CheckEnv.jar CLASSPATH'
'java -jar CheckEnv.jar INCLUDE'
'java -jar CheckEnv.jar LIB'

The output looks like e.g.

Checking C:\Program Files\Java\jdk1.6.0_22\jre\bin - variable exists
Checking C:\Program Files\Reflection - variable exists
Checking C:\Perl\bin\ - variable exists

Enjoy!