RFR: 8286447: [Linux] AWT should start in Headless mode if headful AWT library not installed

[Kevin Rushforth]

On Wed, 11 May 2022 17:27:38 GMT, Phil Race <prr at openjdk.org> wrote:

> As per the bug report and the CSR (please review that too), this makes AWT load in headless mode
> if only headless libraries are installed.
> 
> It passes all our normal testing which at least should show that this doesn't regress anything.
> I had to manually remove libawt_xawt.so to verify that it will do as expected in such a case,
> and it would not be easy to create a test for that.
> 
> CSR : https://bugs.openjdk.java.net/browse/JDK-8286598

Looks good. I verified that it does what I would expect.

src/java.desktop/unix/classes/sun/awt/PlatformGraphicsInfo.java line 70:

> 68:          * to try headful and then unwind that and then retry as headless.
> 69:          */
> 70:         final String[] libDirs = System.getProperty("sun.boot.library.path", "").split(":");

Does reading this property also need to be in a `doPrivileged`?

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Marked as reviewed by kcr (Author).

PR: https://git.openjdk.java.net/jdk/pull/8659