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From "Kevin Zhou" <zhoukevi...@gmail.com>
Subject Re: [jira] Created: (HARMONY-6034) [classlib] [luni] Should Improve File System Exception Messages
Date Fri, 05 Dec 2008 03:03:58 GMT
The FileNotFoundException is being thrown by the constructor of
FileOutputStream when that constructor is attempting to open File f for
writing and it doesn't have permission to do so.

To open f the FileOutputStream class is calling
org.apache.harmony.luni.platform.OSFileSystem.open(). The
o.a.h.l.p.OSFileSystem.open() method invokes a native openImpl() method. The
native method can fail for several reasons. The problem lies in the fact
that the reason behind the failure of the native method isn't being
propagated back to the FileOutputStream which is creating the
FileNotFoundException upon failure.

On Fri, Dec 5, 2008 at 10:50 AM, Kevin Zhou (JIRA) <jira@apache.org> wrote:

> [classlib] [luni] Should Improve File System Exception Messages
> ---------------------------------------------------------------
>
>                 Key: HARMONY-6034
>                 URL: https://issues.apache.org/jira/browse/HARMONY-6034
>             Project: Harmony
>          Issue Type: Improvement
>          Components: Classlib
>    Affects Versions: 5.0M8
>            Reporter: Kevin Zhou
>             Fix For: 5.0M9
>
>
> Given a test scenario [1] where "t:" is a mapped drive letter to which the
> current user only has R+E access but doesn't have W acess.
> Conduct this on RI [2] and HARMONY [3]. Obviously, RI return a
> FileNotFoundException with a "Access is denied" message while HARMONY does
> not provide information as to why the file is not found. This also occurs
> when the corresponding file doesn't exist, RI will throw FNF with "system
> fails to find ...".
>
> I think there is a difference in information returned that makes it a bit
> easier to understand why the FNF Exception is occurring.
> Should we improve this?
>
> [1]
>    public static void main(String[] args) {
>        try {
>            File f = new File("t:/temp.file");
>            if (f.exists()) {
>                System.out.println("File " + f.getAbsolutePath() + "
> exists");
>            }
>            FileOutputStream fos = new FileOutputStream(f);
>            fos.write("Hello, World!".getBytes());
>            fos.close();
>        } catch (FileNotFoundException fnfe) {
>            fnfe.printStackTrace(System.err);
>        } catch (Throwable t) {
>            t.printStackTrace(System.err);
>        }
>    }
>
> [2] Output from a FileNotFoundException on RI:
> java.io.FileNotFoundException: t:/temp.file (Access is denied)
> at java.io.FileOutputStream.open(Native Method)
> at java.io.FileOutputStream.<init>(FileOutputStream.java:201)
> at java.io.FileOutputStream.<init>(FileOutputStream.java:153)
> at test.Main.main(Main.java:23)
>
> [3] Output from a FileNotFoundException on HARMONY:
> java.io.FileNotFoundException: t:/temp.file
> at java.io.FileOutputStream.<init>(Unknown Source)
> at java.io.FileOutputStream.<init>(Unknown Source)
> at test.Main.main(Main.java:23)
>
> --
> This message is automatically generated by JIRA.
> -
> You can reply to this email to add a comment to the issue online.
>
>

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