[re] Java executables can abort trying to access a null pointer in a leaf function

Thu Feb 2 20:12:00 GMT 2006

> The longer I look at this, the more bizarre it is.
>> I'm wondering if maybe _Jv_ThrowNullPointerException either has no
> unwind info or its unwind info is not found. That would do it.
>> Maybe no methods in libgcj can throw exceptions. Try
>> StringBuffer.append(char[] data, int offset, int count) with something
> out of bounds. See if you can catch that.
>> If that works, see if something like native code
> FileChannelImpl.open (String, int) can throw a FileNotFoundException.

Actually, I guess that the StringBuffer.append really isn't working. 
If my code looks like:
public class NullPointer
{
 private int i = 5;
 private static int j = 10;
 public static void main(String[] args)
 {
 try
 {
 new NullPointer().foo(null);
 }
 catch (NullPointerException x)
 {
 System.out.println("Caught an exception!");
 System.out.println(x);
 }
 }
 void foo(NullPointer e)
 {
 StringBuffer sb = new StringBuffer("hello there");
 char c[] = {'a', 'b', 'c', 'd'};
 sb.append(c, 2, 3);
 System.out.println(sb);
 };
}
I never do see the "Caught an exception!" message. I had thought the
exeption in thread main was the print of x, but I guess it isn't.