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https://issues.apache.org/jira/browse/VFS-770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17527834#comment-17527834
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Bernd Eckenfels commented on VFS-770:
-------------------------------------
BTW just FYI April 22 Update of Java 17 (and others) introduced new Mime types
including the ones for `.gz` (`application/gzip`) and `.jar`
(`application/java-archive`).
This bugfix helps with these new types in a way that it will consider the file
extensions when the new types are not registered. It therefore would have
prevented a regression for us.
Backports are here: https://bugs.openjdk.java.net/browse/JDK-8273655
> FileSystemManager.createFileSystem(FileObject) fails on Gzip files.
> -------------------------------------------------------------------
>
> Key: VFS-770
> URL: https://issues.apache.org/jira/browse/VFS-770
> Project: Commons VFS
> Issue Type: Bug
> Affects Versions: 2.6.0
> Environment: Both Java 8 and Java 13
> Reporter: Thomas BELOT
> Priority: Major
> Fix For: 2.10.0
>
>
> Stack trace :
> {noformat}
> Exception in thread "main" org.apache.commons.vfs2.FileSystemException: Could
> not find a file provider that can handle file "file:///C:/DIR/00-test.gz".
> at
> org.apache.commons.vfs2.FileSystemException.requireNonNull(FileSystemException.java:87)
> at
> org.apache.commons.vfs2.impl.DefaultFileSystemManager.createFileSystem(DefaultFileSystemManager.java:909)
> at MyClass.test(MyClass.java:77)
> at
> java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
> at
> java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
> at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
> at
> java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
> at
> java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
> at
> java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
> at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
> at
> java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
> at one.util.streamex.AbstractStreamEx.forEach(AbstractStreamEx.java:314)
> at MyClass.main(MyClass.java:45)
> {noformat}
> Caused by :
> [fileNameMap.getContentTypeFor(name);|https://gitbox.apache.org/repos/asf?p=commons-vfs.git;a=blob;f=commons-vfs2/src/main/java/org/apache/commons/vfs2/impl/FileContentInfoFilenameFactory.java;h=2888ff6545055c8d00cbd73412671d17560b2592;hb=HEAD#l42]
> which delegates content type resolution to Java's
> URLConnection.getFileNameMap() which in turn resolves GZip to a generic
> application/octet-stream hence leading to this exception.
> If the resolution had triggered a null or an application/x-gzip it would not
> have lead to this problem.
> Forcing resolution with fsManager.createFileSystem("gz",f) is a workaround
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