libjava/testsuite/libjava.lang/Throw_2.java

   1 // Check that NullPointerExceptions thrown from library code are
   2 // caught.  This detects a number of failures that can be caused by
   3 // libgcj being built incorrectly.  In particular, we ensure that a
   4 // SEGV in native (i.e. C++) code in libgcj is handled correctly.
   5
   6 // Regrettably, we cannot guarantee that Double.parseDouble() will
   7 // always be native code, or that it will never be inlined.  It could
   8 // be argued that we should add a method to libgcj that will be
   9 // guaranteed forever to be native, but I'm reluctant to add to the
  10 // library for the sole purpose of performing this test.
  11
  12 public class Throw_2
  13 {
  14   public static Throwable obj()
  15     {
  16       return null;
  17     }
  18
  19   public static String str()
  20     {
  21       return null;
  22     }
  23
  24   static double d;
  25
  26   public static void main (String[] args)
  27     {
  28       // This NullPointerException will, at the time of writing, be
  29       // thrown from Java code in libgcj.
  30       try
  31         {
  32           java.util.Vector v = new java.util.Vector (null);
  33           System.out.println ("fail: no exception thrown");
  34         }
  35       catch (NullPointerException _)
  36         {
  37           System.out.println ("1");
  38         }
  39       catch (Throwable _)
  40         {
  41           System.out.println ("fail: " + _);
  42         }
  43       // This one will, at the time of writing, be thrown from C++
  44       // code in libgcj.
  45       try
  46         {
  47           d = Double.parseDouble(str());
  48           System.out.println ("fail: no exception thrown");
  49         }
  50       catch (NullPointerException _)
  51         {
  52           System.out.println ("2");
  53         }
  54       catch (Throwable _)
  55         {
  56           System.out.println ("fail: " + _);
  57         }
  58     }
  59 }