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https://issues.apache.org/jira/browse/HADOOP-14157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15901380#comment-15901380
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Simon Scott commented on HADOOP-14157:
--------------------------------------
I have debugged this issue and believe I have a good understanding of the cause.
I believe that registering the {{FsUrlStreamHandlerFactory}} causes it to
create an {{FsUrlStreamHandler}} instance for use by "file" scheme URLs. So it
has effectively replaced the usual {{sun.net.www.protocol.file.Handler}}.
When called upon to parse a string into a URL, the
{{sun.net.www.protocol.file.Handler}} overrides {{parseURL}} in order to
replace any {{File.separatorChar}} with '/', before calling the
{{super.parseURL}}.
The {{FsUrlStreamHandler}} does not include this override. So on Windows,
backslashes can be passed through untranslated and so we have an invalid URL.
> FsUrlStreamHandlerFactory "Illegal character in path" parsing file URL on
> Windows
> ---------------------------------------------------------------------------------
>
> Key: HADOOP-14157
> URL: https://issues.apache.org/jira/browse/HADOOP-14157
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Affects Versions: 2.7.3, 2.6.5, 3.0.0-alpha2
> Environment: Windows
> Reporter: Simon Scott
> Priority: Minor
>
> After registering the FsUrlStreamHandlerFactory with the JVM, subsequent
> calls to convert a "file" URL to a URI can fail with "Illegal character in
> path" where the illegal character is a backslash.
> For example:
> {code}
> URL.setURLStreamHandlerFactory(new FsUrlStreamHandlerFactory());
> File file = new File("C:/Users");
> final URL url = new URL("file:///" + file.getAbsolutePath());
> {code}
> gives stack trace:
> {noformat}
> java.net.URISyntaxException: Illegal character in path at index 8:
> file:/C:\Users
> at java.net.URI$Parser.fail(URI.java:2848)
> at java.net.URI$Parser.checkChars(URI.java:3021)
> at java.net.URI$Parser.parseHierarchical(URI.java:3105)
> at java.net.URI$Parser.parse(URI.java:3053)
> at java.net.URI.<init>(URI.java:588)
> at java.net.URL.toURI(URL.java:946)
> {noformat}
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