On Tue, 4 Nov 2025 15:00:13 GMT, Daniel Fuchs <[email protected]> wrote:

>> This change makes it possible to use a VirtualThread for the 
>> QuicSelectorThread. The default will be to use a VirtualThread on all 
>> platforms except the Windows platform. We might consider switching the 
>> default for Windows platform too once 
>> [JDK-8334574](https://bugs.openjdk.org/browse/JDK-8334574) is fixed.
>> 
>> The change should be transparent for users of the API. However, using a 
>> VirtualThread may result in subtle differences in thread scheduling and 
>> class loading, so this change also includes an escape hatch  (a non 
>> documented internal system property) that could be used to revert to a 
>> platform thread in case of unexpected issues.  That property may be removed 
>> in a future version of the JDK.
>
> Daniel Fuchs has updated the pull request incrementally with 11 additional 
> commits since the last revision:
> 
>  - Apply suggestion from @dfuch
>  - Update test/jdk/java/net/httpclient/http3/H3QuicVTTest.java
>    
>    Co-authored-by: Volkan Yazıcı <[email protected]>
>  - Update test/jdk/java/net/httpclient/http3/H3QuicVTTest.java
>    
>    Co-authored-by: Volkan Yazıcı <[email protected]>
>  - Update test/jdk/java/net/httpclient/http3/H3QuicVTTest.java
>    
>    Co-authored-by: Volkan Yazıcı <[email protected]>
>  - Update test/jdk/java/net/httpclient/http3/H3QuicVTTest.java
>    
>    Co-authored-by: Volkan Yazıcı <[email protected]>
>  - Update test/jdk/java/net/httpclient/http3/H3QuicVTTest.java
>    
>    Co-authored-by: Volkan Yazıcı <[email protected]>
>  - Update test/jdk/java/net/httpclient/http3/H3QuicVTTest.java
>    
>    Co-authored-by: Volkan Yazıcı <[email protected]>
>  - Update test/jdk/java/net/httpclient/http3/H3QuicVTTest.java
>    
>    Co-authored-by: Volkan Yazıcı <[email protected]>
>  - Update test/jdk/java/net/httpclient/http3/H3QuicVTTest.java
>    
>    Co-authored-by: Volkan Yazıcı <[email protected]>
>  - Update test/jdk/java/net/httpclient/http3/H3QuicVTTest.java
>    
>    Co-authored-by: Volkan Yazıcı <[email protected]>
>  - ... and 1 more: https://git.openjdk.org/jdk/compare/8a53537c...3a0b2a69

src/java.net.http/share/classes/jdk/internal/net/http/quic/QuicEndpoint.java 
line 148:

> 146:         MAX_BUFFERED_LOW = maxBufferLow;
> 147:         String useVtForSelector =
> 148:                 
> System.getProperty("jdk.internal.httpclient.quic.useVTForSelector", 
> "default");

Suggestion:

                
System.getProperty("jdk.internal.httpclient.quic.selector.useVirtualThreads", 
"default");

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/27827#discussion_r2490853880

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