RFR: JDK-8265078: jpackage tests on Windows leave large temp files

[Andy Herrick]

On Tue, 13 Apr 2021 20:26:56 GMT, Andy Herrick <herrick at openjdk.org> wrote:

>> src/jdk.jpackage/share/classes/jdk/jpackage/internal/IOUtils.java line 59:
>> 
>>> 57: 
>>> 58:     public static void deleteRecursive(Path directory) throws IOException {
>>> 59:         final IOException [] exception = { (IOException) null };
>> 
>> Do we know `Files.walkFileTree()` synchronizes calls on callback object? If not, I'd use `AtomicReference` to store the first exception.
>
> That seems like overkill.  walkFileTree must call visitFile, preVisitDirectory, and postVisitDirectory synchronously, because their return value tells walkFileTree where to go next.

I can use AtomicReference instead of Array to hold the IOException, but must I lock around access, there is no "setIfNull()" method

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PR: https://git.openjdk.java.net/jdk/pull/3473