RFR: 8301846: Invalid TargetDataLine after screen lock when using JFileChooser or COM library [v3]

[Alexey Ivanov]

On Wed, 26 Jul 2023 23:35:25 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

> is it possible that our "::CoInitialize(NULL);" prevents the ::CoInitializeEx(NULL, COINIT_MULTITHREADED); in the lib later?

It is not only possible, it is explicitly stated. If the threading mode is different, the function fails with `RPC_E_CHANGED_MODE`.

> But if that code requare com my expectation would be that they call CoInitialize/CoUninitialize.

Exactly! Microsoft docs don't state COM needs be initialised for enumerating devices but it looks like it needs to be.

> This CoInitialize initially was added here [JDK-6950553](https://bugs.openjdk.org/browse/JDK-6950553) (check the stack trace)

It somewhat confirms, you can't access COM without initialising it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14898#discussion_r1276530242