public String createSecurePassword() {
    return createSecurePassword(null, null, null, null, null, null);
  }
Create a secure (random) password using a secure random number generator and a set of (reasonable)
characters.
<p/>
The default rules are used to generate the password. See {@link #createSecurePassword(Integer, Integer, Integer, Integer, Integer, Integer)}

@return a String containing the new password
@see #createSecurePassword(Integer, Integer, Integer, Integer, Integer, Integer)
ambari-server/src/main/java/org/apache/ambari/server/security/SecurePasswordHelper.java