RFR: 8319540: GC: Make TestSelectDefaultGC use createTestJavaProcessBuilder

[Stefan Karlsson]

On Wed, 26 Nov 2025 16:03:23 GMT, Ramkumar Sunderbabu <rsunderbabu at openjdk.org> wrote:

> > We now how this:
> > ```
> >         // Start VM without specifying GC
> >         OutputAnalyzer output = GCArguments.executeTestJava(
> > ```
> > 
> > 
> >     
> >       
> >     
> > 
> >       
> >     
> > 
> >     
> >   
> > It sounds to me that the comment say that we're running with out specifying a GC, but with this change we do. I think you need to update the comment or add appropriate requires line(s).
> 
> We still don't allow the GC flags. If the test was started with a GC flags, "@requires vm.gc.Serial & vm.gc.G1" will skip the test. Hence, the comment is still valid.

OK. Now I understand.

I saw that you mentioned the obscure `@requires vm.gc.Serial & vm.gc.G1` pattern and that you were going see if we could make a clearer property. I think that would be beneficial.

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PR Comment: https://git.openjdk.org/jdk/pull/28422#issuecomment-3584796289