interesting on JVM crash

Class CrashExample will cause JVM crashes on JDK6 and JDK7, while Crash does not crash on JDK7, although it hangs forever on JDK6.
public class CrashExample {
 public static void main(String[] args) {
  new sun.dc.pr.PathDasher(null);
 }
}

public class Crash {
 public static void main(String[] args) {
  try {
   startSecondJVM();
  } catch (Exception e) {
   e.printStackTrace();
  }
  System.out.println("Hello crash.");
 }

 public static void startSecondJVM() throws Exception {
  String separator = System.getProperty("file.separator");
  String classpath = System.getProperty("java.class.path");
  String path = System.getProperty("java.home")
                 + separator + "bin" + separator + "java";
  System.out.println("path="+path);
  ProcessBuilder processBuilder =
                 new ProcessBuilder(path, "-cp",
                 classpath,
                 CrashExample.class.getName());
//  processBuilder.inheritIO();
  Process process = processBuilder.start();
  process.waitFor();
 }
}