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From Rory O'Donnell <>
Subject JDK 17 EA build 18 is available
Date Tue, 20 Apr 2021 09:51:08 GMT

*Hi Stefan/Jaikiran, *

*OpenJDK 17 Early Access build 18****is now available at 
** <>*

  * These early-access , open-source builds are provided under the
      o GNU General Public License, version 2, with the Classpath
        Exception <>
  * Release Notes are available at

**G1 pauses may be extremely long with EA build JDK-17+18*

*During performance testing we noticed that due to a recent change 
(JDK-8262068) GC pauses after a G1 full GC may be extremely slow. The 
problem has been fixed with JDK-8264987 and that has already been 
integrated. This change will be available with the following EA build  
JDK-17+19.  For more technical info please see [1]

*JEP 382 [2]**  - Starting with build 19, **JDK 17 for macOS is 
*temporarily* switched from using OpenGL**to using Apple's Metal 
API**for Java 2D rendering.*

Heads up to anyone who is testing JDK 17 for running apps on macOS. 
Starting with build 19, JDK 17 for macOS is *temporarily* switched from 
using OpenGL to using Apple's Metal API for Java 2D rendering.

If you are running any kind of 2D / Swing/ AWT UI application on macOS, 
and see any rendering related problems
starting with JDK 17 b19, please do report them to us along with a test 
case and screen shots.

You may also set "-Dsun.java2d.opengl=true" to re-enable OpenGL - which  
implicitly disables Metal - to confirm that it is a Metal related 
rendering glltch.



Rgds, Rory O'Donnell
Quality Engineering Manager
Oracle EMEA, Dublin, Ireland

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