RFR: 8328874: Class::forName0 should validate the class name length early [v15]

[Guanqiang Han]

On Sun, 7 Sep 2025 20:09:53 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Guanqiang Han has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Use a different native method for testNative, since the implementation of forName has changed.
>
> src/java.base/share/classes/java/lang/Class.java line 4162:
> 
>> 4160:         if (!ModifiedUtf.isValidLengthInConstantPool(name)) {
>> 4161:             throw new ClassNotFoundException(
>> 4162:                     "Class name length exceeds limit of " + ModifiedUtf.CONSTANT_POOL_UTF8_MAX_BYTES);
> 
> Suggestion:
> 
>                     "Class name length exceeds limit of " + ModifiedUtf.CONSTANT_POOL_UTF8_MAX_BYTES + ": " + name);

@liach Thanks for the suggestion.
I think including the name is useful, but since it can be extremely long in this case, I’d prefer to log only the first part (e.g. first 256 chars + “…”) to give context without flooding the logs.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26802#discussion_r2331704563