Ternary Boxing -- Java Puzzler -- What does this print?

TernaryBoxing.java

// License: Public Domain
//
// Java Puzzler: what does this print?
public class TernaryBoxing {
  public static void main(String[] args) {
    Long nullLong = null;
    try {
      takesLong(true ? nullLong : 1);
    } catch (NullPointerException e) {
      System.out.println("1");
    }
    try {
      takesLong(true ? nullLong : 1L);
    } catch (NullPointerException e) {
      System.out.println("2");
    }
    try {
      takesLong(true ? nullLong : (Long) 1L);
    } catch (NullPointerException e) {
      System.out.println("3");
    }
  }

  public static void takesLong(Long x) {
    System.out.println(x);
  }
}