RFR: 6616245: NullPointerException when using JFileChooser with a custom FileView [v9]

[Alexey Ivanov]

On Tue, 11 Oct 2022 10:35:35 GMT, Tejesh R <tr at openjdk.org> wrote:

>> When a custom `FileView` is used and folder traversal is restricted to a particular directory NPE occurs when user tries to traverse/select other folders except traversable folder. This is caused because when user selects folder other than traversable, the traversal is rejected and hence no file is selected as `currentDirectory` of `JFileChooser`. When user tries to access the restricted folder second time, previous selected file check is failing because of NPE since `getFileChooser().getCurrentDirectory();` is null. To fix the issue, NPE check is added.
>
> Tejesh R has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Updated based on review comments

Marked as reviewed by aivanov (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/10485