<AWT Dev> RFR: 8212700: Change the mechanism by which JDK loads the platform-specific AWT Toolkit

Philip Race philip.race at oracle.com
Wed May 8 03:29:52 UTC 2019

On 5/7/19, 7:47 PM, Sergey Bylokhov wrote:
> Hi, Phil.
> Looks fine, but probably it will be worth to rename 
> PlatformGraphicsInfo to PlatformInfo?

I don't want (or intend) to do that. I already knew I was going
to re-use this class for this purpose when I created it and adjusted
the classname then to be reasonably acceptable. There is no ideal
and PlatformInfo isn't it either.


> On 06/05/2019 15:11, Phil Race wrote:
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8212700
>> CSR: https://bugs.openjdk.java.net/browse/JDK-8223417
>> Webrev: https://cr.openjdk.java.net/~prr/8212700
>> Please review this bug + CSR to remove the awt.headless system property.
>> This should be the last of the fixes to remove use of system
>> properties set in the launcher to specify per-platform
>> internal classes and/or behaviours of the java.desktop module.
>> Half of the change is removing code from the launcher, and
>> then some small changes in Toolkit.java to consult a new
>> method in the per-platform internal PlatformGraphicsInfo.java class.
>> However it was also necessary to update each of the platform toolkit 
>> class
>> constructor code since they all get/set a system property to support
>> extra mouse buttons (I don't know why this could not be shared in
>> SunToolkit but that is another matter than this fix), and two of them
>> access the root thread group. Previously they inherited privileges
>> from the code in java.awt.Toolkit which instantiated them but now
>> they need to assert the privileges directly - at to the point of use.
>> As well as adding a simple new regression test, all the automated
>> headless tests and many automated headful tests were run as well
>> as basic manual testing.
>> The CSR also covers updating the javadoc of Toolkit.getDefaultToolkit()
>> -phil

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