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From "Antonio Gallardo (JIRA)" <j...@apache.org>
Subject [jira] Commented: (IO-128) NPE on FilenameUtils.equalsNormalizedOnSystem()
Date Mon, 15 Oct 2007 02:56:50 GMT

    [ https://issues.apache.org/jira/browse/IO-128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12534721
] 

Antonio Gallardo commented on IO-128:
-------------------------------------

IMHO, the UNC for "\\" not "//" See: http://en.wikipedia.org/wiki/Path_%28computing%29#Uniform_Naming_Convention
Hence // should be fixed to a single slash. Makes sense?

> NPE on FilenameUtils.equalsNormalizedOnSystem()
> -----------------------------------------------
>
>                 Key: IO-128
>                 URL: https://issues.apache.org/jira/browse/IO-128
>             Project: Commons IO
>          Issue Type: Bug
>          Components: Utilities
>    Affects Versions: 1.2, 1.3, 1.3.1, 1.3.2
>            Reporter: Antonio Gallardo
>            Assignee: Niall Pemberton
>             Fix For: 1.4
>
>
> The following code in commons-io (1.3.2) throws an NPE exception:
> org.apache.commons.io.FilenameUtils
>     .equalsNormalizedOnSystem(
>             "//a.html",
>             "//ab.html");
> And here is the exception:
> java.lang.NullPointerException: The strings must not be null
>    at org.apache.commons.io.IOCase.checkEquals(IOCase.java:141)
>    at org.apache.commons.io.FilenameUtils.equals(FilenameUtils.java:984)
>    at org.apache.commons.io.FilenameUtils.equalsNormalizedOnSystem(FilenameUtils.java:956)
>    at CodeSnippet_32.run(CodeSnippet_32.java:4)
>    at org.eclipse.jdt.internal.debug.ui.snippeteditor.ScrapbookMain1.eval(ScrapbookMain1.java:20)
>    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>    at java.lang.reflect.Method.invoke(Method.java:585)
>    at org.eclipse.jdt.internal.debug.ui.snippeteditor.ScrapbookMain.evalLoop(ScrapbookMain.java:54)
>    at org.eclipse.jdt.internal.debug.ui.snippeteditor.ScrapbookMain.main(ScrapbookMain.java:35)
> I think it is wrong a message "The strings must not be null", since there is not a null
string involved in the call.
> Interesting is if both or 1 of the strings is null, it did not throws an exception.
> Additional comment from Niall Pemberton (on the dev mail list):
> The problem is that the FilenameUtils's normalize(String) method
> returns "null" if it thinks the file names are invalid - which in your
> case it seems to be doing so for both file names.
> So I guess theres two issues here - you're right the error is
> misleading and FilenameUtils should check the names again after
> calling normalize() for nulls and throw a more appropriate message.

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