//+
String LOGFILENAME = "error.log";
System.setErr(new PrintStream(new FileOutputStream(LOGFILENAME)));
System.out.println("Please look for errors in " + LOGFILENAME);
// Now assume this is somebody else's code; you'll see it writing to stderr...
int[] a = new int[5];
a[10] = 0; // here comes an ArrayIndexOutOfBoundsException
//-
