RFR: 8373876: StackWalkNativeToJava print more output in case of failures [v2]

[David Holmes]

On Fri, 19 Dec 2025 08:26:48 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> test/hotspot/jtreg/runtime/ErrorHandling/StackWalkNativeToJava.java line 77:
>> 
>>> 75:         }
>>> 76: 
>>> 77:         assertTrue(res.length == 3, res.length - 1);
>> 
>> Suggestion:
>> 
>>         assertTrue(res.length == 3, res.length);
>> 
>> You need to adjust both parts
>
> not sure, in one of our failures with added output it says this
> `java.lang.RuntimeException: Count error: count was 3`
> and indeed, 3 times the pattern we check for is in the output 
> StackWalkNativeToJava$TestNativeToJavaNative.callNativeMethod()V
> 
> But anyway , nowhere is defined what 'count' really means.

I am assuming that the assertTrue's first argument is the value check of a given variable, and the second is the actual value of that variable. So if we were comparing `length -1` then the actual value is `length-1`. but now we check length then the actual value is length.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28871#discussion_r2635040484