code: public void printUserProfileActionsForLastName(String lastName) {
      // Create a partial key that will allow us to start the scanner from the
      // first user record that has last name equal to the one provided.
      PartitionKey startKey = new PartitionKey("lastName");
  
      // Get the scanner with the start key. Null for stopKey in the getScanner
      // method indicates that the scanner will scan to the end of the table. Our
      // loop will break out when it encounters a record without the last name.
  
      EntityScanner<UserProfileActionsModel> scanner = userProfileActionsDao
          .getScanner(startKey, null);
      scanner.initialize();
      try {
        // scan until we find a last name not equal to the one provided
        for (UserProfileActionsModel entity : scanner) {
          if (!entity.getUserProfileModel().getLastName().equals(lastName)) {
            // last name of row different, break out of the scan.
            break;
          }
          System.out.println(entity.toString());
        }
      } finally {
        // scanners need to be closed.
        scanner.close();
      }
    }
docs: Print the user profiles and actions for all users with the provided last
  name
  
  This method demonstrates how to open a scanner with a start key. It's using
  the composite dao, so the records it returns will be a composite of both
  the profile model and actions model.
  
  @param lastName
  The last name of users to scan.