How can I pass environment variables to the child process?

How can I pass environment variables to the child process? This is what I tried and it didn't work.
     static public void main (String[] args) throws Exception {
          ProcessBuilder b = new ProcessBuilder("java", "-cp", ".", "Child");
          Map<String, String> map = b.environment();
          map.put("custom.property", "my value");
             b.redirectErrorStream(true);
          Process p = b.start();
          BufferedReader reader = new BufferedReader (new InputStreamReader(p.getInputStream()));
          String line = null;
          while (null != (line = reader.readLine())) {
               System.out.println(line);
     public static void main(String[] args) {
          System.out.println("The value of custom.property is : " + System.getProperty("custom.property"));
     }and the result is:
The value of custom.property is : null

Complete test:
     static public void main (String[] args) throws Exception {
          ProcessBuilder b = new ProcessBuilder("java", "-Dcustom.property=my property value", "-cp", ".", "Child");
          Map<String, String> map = b.environment();
          map.put("custom.property", "my environment value");
             b.redirectErrorStream(true);
          Process p = b.start();
          BufferedReader reader = new BufferedReader (new InputStreamReader(p.getInputStream()));
          String line = null;
          while (null != (line = reader.readLine())) {
               System.out.println(line);
     public static void main(String[] args) {
          System.out.println("Property value of custom.property is : " + System.getProperty("custom.property"));
          System.out.println("Environment value of custom.property is : " + System.getenv("custom.property"));
     }

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