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From "Andrew Zhang" <zhanghuang...@gmail.com>
Subject Re: [classlib][kernel]A bug or non-bug difference?
Date Thu, 19 Oct 2006 10:01:10 GMT
On 10/19/06, Tony Wu <wuyuehao@gmail.com> wrote:
>
> I've tried Log4j on Harmony and found there are many failures caused
> by one difference between RI and Harmony. The
> Throwable.printStackTrace(PrintWriter) calls the *println* method of
> PrinterWriter on RI whereas calls *print* twice(Obviously print
> msssage then print a line separator) on Harmony. It will cause
> different behavior when a user inherit the PrinterWriter and override
> these two methods. Shall we fix it or leave as an non-bug difference?


For this case, RI doesn't conflict with spec, and is reasonable, so I think
we'd better follow RI.  Additionally, log4j has shown its dependency of this
feature!

refer to testcase below,
>
> public class TestThrow {
>    public static void main(String[] args) {
>        MyWriter mw = new MyWriter(System.out);
>        Throwable throwable = new Exception("Just Testing");
>        throwable.printStackTrace(mw);
>    }
> }
> class MyWriter extends PrintWriter {
>    public MyWriter(OutputStream out) {
>        super(out);
>    }
>
>    public void print(String s) {
>        System.out.println("print");
>    }
>
>    public void println(String s) {
>        System.out.println("println");
>    }
> }
> OUTPUTS:
> RI
> println
> HARMONY
> print
> print
>
> --
> Tony Wu
> China Software Development Lab, IBM
>
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>


-- 
Best regards,
Andrew Zhang

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