[kaffe] [bug] Method delegation error with superinterfaces
Benja Fallenstein
b.fallenstein at gmx.de
Mon Jul 19 07:59:23 PDT 2004
Hi all,
The following bug is triggered by the combination of Jikes 1.21 with the
current version of Kaffe from CVS. It is not triggered by Jikes +
sunjava or by sunjavac + Kaffe...
With jikes+Kaffe, the following code:
-----------------------------------------------------------------
public class Bug {
static interface I1 {
public String toString();
}
static interface I2 extends I1 {
}
static class CBug implements I2 {
}
public static void main(String[] argv) throws Exception {
I2 b = new CBug();
System.out.println(b);
System.out.println(b.toString().length());
System.out.println(b.toString());
}
}
-----------------------------------------------------------------
gives me this output with a freshly compiled version of Kaffe from CVS:
-----------------------------------------------------------------
benja at joy:/tmp$ jikes Bug.java; kaffe Bug
Bug$CBug at 82d7d50
137009132
java.lang.OutOfMemoryError
at java.io.Writer.write (Writer.java:185)
at java.io.OutputStreamWriter.write (OutputStreamWriter.java:196)
at java.io.PrintWriter.write (PrintWriter.java:542)
at java.io.PrintWriter.write (PrintWriter.java:568)
at java.io.PrintWriter.print (PrintWriter.java:204)
at java.io.PrintWriter.println (PrintWriter.java:453)
at java.io.PrintStream.println (PrintStream.java:389)
at Bug.main (Bug.java:16)
-----------------------------------------------------------------
which is obviously wrong, since the returned string should be
"Bug$CBug at 82d7d50", which does not have length 137009132...
I first noticed this bug in a much more complex program, where I would
get NullPointerExceptions when calling any method on the string returned
by toString().
Not sure whether this should be seen as a bug in Kaffe or Jikes -- but
since Kaffe aims to run programs that work on Sun's JDK, I guess this
should be fixed. I don't understand Kaffe well enough to do it, though.
Cheers,
- Benja
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