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https://issues.apache.org/jira/browse/IO-663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17081813#comment-17081813
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Gary D. Gregory commented on IO-663:
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How about trying {{org.apache.commons.io.file.PathUtils.copyDirectory(Path,
Path, CopyOption...)}} from git master?
Looking at FileUtils, it ends up using NIO's Files class indeed.
Otherwise, PRs are welcome.
> FileUtils.copyDirectory(File srcDir, File destDir) fails on Windows
> -------------------------------------------------------------------
>
> Key: IO-663
> URL: https://issues.apache.org/jira/browse/IO-663
> Project: Commons IO
> Issue Type: Bug
> Reporter: Elliotte Rusty Harold
> Priority: Critical
>
> This bug is shared (likely because of code copied from one place to another)
> between the similar methods in commons IO, codehaus-plexus-utils, and
> maven-shared-utils.
> I don't have an isolated test case because this bug is platform specific and
> I've only seen it in Travis CI builds on Windows using JDK 7 through 15. I
> don't have a Windows system handy to test it. However it is reproducible.
> Typical code that triggers it is in RestoreBackupPomsPhaseTest in
> maven-release:
> ```
> // copy poms so tests are valid without clean
> File sourceDir = getTestFile( "src/test/resources" + projectPath );
> File testDir = getTestFile( "target/test-classes" + projectPath );
> FileUtils.copyDirectoryStructure( sourceDir, testDir );
> ```
> I don't know whether there might be something weird in the setup of those two
> directories that's involved.
> Typical error message is:
> Caused by: java.nio.file.FileSystemException:
> F:\jenkins\jenkins-slave\workspace\maven-box_maven-release_windows@2@2\windows-jdk8-m3.6.x_build\maven-release-manager\target\test-classes\projects\restore-backup-poms\basic-pom\pom.xml:
> The process cannot access the file because it is being used by another
> process
> "The process cannot access the file because it is being used by another
> process" I think points to the root of the bug. This is a Windows file system
> error message.
> Some history is here where I noticed it:
> https://github.com/apache/maven-release/pull/42
> In this case, I started with plexus-utils 3.1.0 which worked, upgraded t
> plexus-utils 3.3.0, which didn't. And then tried the FileUtils.copyDirectory
> from both maven-shared-utils and commons-io, all of which failed in the same
> way.
> I think this is caused by the use of NIO, which doesn't work quite the same
> when copying files on Windows as on Linux and Mac OS X.
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