RFR: 8283621: Write a regression test for CCC4400728

[Manukumar V S]

On Thu, 24 Mar 2022 15:22:35 GMT, Manukumar V S <mvs at openjdk.org> wrote:

> Write a regression test for [JDK-4400728](https://bugs.openjdk.java.net/browse/JDK-4400728)
> 
> Issue:
> JFileChooser constructors by default set current directory to the "Desktop" value on Windows,
> but should use 'My Documents' property instead, also user.home for unix platforms.
> 
> javadoc says:
> "public JFileChooser()
> Constructs a JFileChooser pointing to the user's default directory. This default depends on the operating system. It is typically the 'My Documents' folder on Windows, and the user's home directory on Unix.
> "
> See this https://docs.oracle.com/en/java/javase/17/docs/api/java.desktop/javax/swing/JFileChooser.html#%3Cinit%3E()
> 
> Testing:
> 1. Tested using Mach5(20 times per platform) in macos,linux and windows and got all pass.
> 2. Tested in original failed Java version and the fixed version;
> Java 1.4.0 -> Test Failed.
> $ j2sdk1.4.0/bin/java JFileChooserDefaultDirectoryTest
> java.lang.NullPointerException
>         at java.io.File.<init>(File.java:180)
>         at sun.awt.shell.Win32ShellFolder.listFiles(Win32ShellFolder.java:517)
>         at sun.awt.shell.Win32ShellFolderManager.get(Win32ShellFolderManager.java:152)
>         at sun.awt.shell.ShellFolder.get(ShellFolder.java:208)
>         at javax.swing.plaf.metal.MetalFileChooserUI.installComponents(MetalFileChooserUI.java:310)
>         at javax.swing.plaf.basic.BasicFileChooserUI.installUI(BasicFileChooserUI.java:130)
>         at javax.swing.plaf.metal.MetalFileChooserUI.installUI(MetalFileChooserUI.java:152)
>         at javax.swing.JComponent.setUI(JComponent.java:445)
>         at javax.swing.JFileChooser.updateUI(JFileChooser.java:1701)
>         at javax.swing.JFileChooser.setup(JFileChooser.java:345)
>         at javax.swing.JFileChooser.<init>(JFileChooser.java:320)
>         at javax.swing.JFileChooser.<init>(JFileChooser.java:273)
>         at JFileChooserDefaultDirectoryTest.main(JFileChooserDefaultDirectoryTest.java:15)
> Exception in thread "main"
> 
> Java 1.5.0 -> Test Passed.
> $ jdk1.5.0/bin/java JFileChooserDefaultDirectoryTest
> UserHome dir = C:\Users\jpgansible
> Test Passed
> 
> Java 1.8.0 -> Test Passed.
> $ jdk1.8.0_331/bin/java JFileChooserDefaultDirectoryTest
> UserHome dir = C:\Users\jpgansible
> Test Passed

@aivanov-jdk Can you please review this.

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PR: https://git.openjdk.java.net/jdk/pull/7942