RFR: 4138921: TextLayout handling of empty strings

[Sergey Bylokhov]

On Wed, 17 Sep 2025 23:39:04 GMT, Daniel Gredler <dgredler at openjdk.org> wrote:

>>> @prrace: In the [CSR](https://bugs.openjdk.org/browse/JDK-8366563) for this change, Joe said "Please consider whether or not a release note is warranted for the behavior change on which exception gets thrown." I think this is above my pay grade, no? Do I need to raise any flags with anyone about this?
>> 
>> 
>> I don't think it is high profile enough to need a release note. 
>> 
>> However one thing that you forgot is that I wrote early on in this PR :
>> "Several JCK tests for TextLayout constructor fail (surprise !)
>> They all fail because they use a null FRC.
>> We need a CSR for this anyway but I'll need to co-ordinate problem listing those tests as part of this bug so we don't see failures as soon as it is pushed."
>> 
>> meaning I was hoping I could push that problem listing (it is an internal thing) right at the same time you pushed, because our CI system started to report the failures already.
>
>> I don't think it is high profile enough to need a release note.
> 
> OK, sounds good.
> 
>> I was hoping I could push that problem listing (it is an internal thing) right at the same time you pushed
> 
> Ah, I'm sorry -- I didn't realize you meant that level of coordination!

Hi @gredler, can you please take a look to [this](https://github.com/openjdk/jdk/blob/cc65836d00de7041e7d32e7f15d98108b1ae47a0/src/java.desktop/share/classes/sun/java2d/pipe/OutlineTextRenderer.java#L76) code in OutlineTextRenderer:

        if ("".equals(str)) {
            return; // TextLayout constructor throws IAE on "".
        }
        TextLayout tl = new TextLayout(str, g2d.getFont(),
                                       g2d.getFontRenderContext());

Do we still need it after this patch?

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PR Comment: https://git.openjdk.org/jdk/pull/26947#issuecomment-3315270892