problems with "InputStreamReader.read" tests in "java.io.Utf8Encoding"

["Steve Murry" <Steve dot Murry at sas dot com>]

Can someone check the 'negative' testcases within
java.io.Utf8Encoding.mojo to see if these are valid tests or not?
Specifically, I'm referring to the 9 testcases with data values that are declared 'test5_bytes' through 'test13_bytes'.  The testcases expect a
CharEncodingException when decoding illegal UTF-8 byte strings.  In some
cases the UTF-8 data is incorrect and in others it represents codepoints
that have not yet been assigned (at least for Unicode 3.2).  As I read the
Sun API description for InputStreamReader.read, I would expect either
MalformedInputException or UTFDataFormatException to be thrown instead (the API description doesn't seem very precise in this area).  In fact, most of the platforms that we have run these testcases against do not throw any type of exception at all!  Only the IBM JREs throw the expected CharConversionException.   We also found the following paragraph in one of the Sun bug descriptions:


>This is a bug in the tests. The specification of java.io.InputStreamReader
>does not require that an implementation throw IOExceptions on malformed
>input when decoding bytes in the UTF-8 charset. That our implementation has
>done this historically is a bug that was fixed as part of 4503732.

I'm not sure I agree with this statement myself (BTW - I believe they are referring to one of their own internal tests, not Mauve), but I'm just trying to get Mauve's take on all of this.  I would appreciate anyone's thoughts.

Thanks,

Steve Murry
SAS Institute