RFR (L, final): 8218626: Add detailed message to NullPointerException describing what is null.

[Thomas Stüfe]

Additionally, since 8224193, stringStream does not use RA anymore, so you
do not need ResourceMarks for the backing buffer. 8224193 has been
backported to 11, btw.

On Mon, Sep 16, 2019 at 2:53 PM Thomas Stüfe <thomas.stuefe at gmail.com>
wrote:

> Hi Goetz,
>
> not a full review, just a small suggestion. In jvm.cpp you could just
> access ss->base() instead of ss->as_string() since the internal buffer is
> already NULL terminated and result_string does not outlive the stringStream
> object. Also it misses including ostream.hpp.
>
> Cheers, Thomas
>
> On Tue, Sep 10, 2019 at 4:46 PM Lindenmaier, Goetz <
> goetz.lindenmaier at sap.com> wrote:
>
>> Hi,
>>
>> the subject should mention 8218628. (Not 8218626).
>> Sorry for this!
>>
>> Best regards,
>>   Goetz.
>>
>> From: Lindenmaier, Goetz
>> Sent: Dienstag, 10. September 2019 11:48
>> To: 'Hotspot dev runtime' <hotspot-runtime-dev at openjdk.java.net>; Java
>> Core Libs <core-libs-dev at openjdk.java.net>
>> Subject: RFR (L, final): 8218626: Add detailed message to
>> NullPointerException describing what is null.
>>
>> Hi,
>>
>> this is the implementation of JEP 358: Helpful NullPointerExceptions.
>>
>> The JEP is in status "Candidate". Coleen (many, many thanks!) ran
>> it through the Oracle-internal processes.  Now I please need final reviews
>> for this change so that I can propose it to target jdk 14.
>>
>> JEP: https://bugs.openjdk.java.net/browse/JDK-8220715
>> Enhancement: https://bugs.openjdk.java.net/browse/JDK-8218628
>> webrev: http://cr.openjdk.java.net/~goetz/wr19/8218628-exMsg-NPE/16/
>>
>> The change ran through a lot of testing, all jtreg and jck tests to name
>> only some. The webrev points to patch
>>
>> http://cr.openjdk.java.net/~goetz/wr19/8218628-exMsg-NPE/16/enable_NPE_message.patch
>> that enables the change by default,  which was useful for testing to
>> assure the code is used in the tests.
>> I just pushed the change to jdk/submit once more.
>>
>> Please review.
>>
>> Thanks!
>>   Goetz.
>>
>