From owner-freebsd-java  Sat Oct 23 13:34:43 1999
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From: Nate Williams <nate@mt.sri.com>
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To: Vince Gonzalez <vince@nycrc.net>
Cc: freebsd-java@FreeBSD.ORG
Subject: Re: Illegal instruction
In-Reply-To: <19991023155032.A1350@moe.nycrc.net>
References: <19991023155032.A1350@moe.nycrc.net>
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Reply-To: nate@mt.sri.com (Nate Williams)
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> I wrote some code like this:
> 
> public class MyPanel extends JPanel {
> 	public Component add(Component c) {
> 		doSomeStuff();
> 		return add(c); // This is incorrect on purpose
> 	}
> }
> 
> I know the line I've commented is incorrect (it should say super.add(c)).  
> When this code is run, java_X bombs out with SIGILL and dumps core.  I'm 
> thinking that it should instead die with StackOverflowError.  I can reproduce
> this very easily, with code very much like the above.

I attemped to reproduce this with the following trivial example, and
Java behaves as expected with the StackOverflowError.

public class Extended extends Base {
    public static void main(String args[]) {
        new Extended().foo(new Object());
    }

    public Object foo(Object a) {
        return foo(a);
    }
}

public class Base {
    public Object foo(Object a) {
        return foo(a);
    }
}

% java -fullversion
java_X full version "jdk1.1.8-FreeBSD:1999/9/22"
% uname -a
FreeBSD moth.mt.sri.com 2.2.8-STABLE FreeBSD 2.2.8-STABLE #4: Tue Jan 26
16:02:55 MST 1999     nate@moth.mt.sri.com:/opt/src/sys/compile/MOTH i386
%

[ Note, it's possible that this bug was fixed in the most recent JDK
release, hence my earlier question about java -fullversion.... ]



Nate


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