Unable to create directory

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Java Forum / General / October 2007

Unable to create directory

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Alan - 08 Oct 2007 19:08 GMT

I`m trying to create a directory for each URL string read in from
a file. However, one of the directories cannot be created, but the
other can. Neither exist at the start. No exception occurs.

Am I missing something obvious? (I have not used mkdir before.)

I am running on the Windows Vista OS. Thanks, Alan

Output:

http://www.weather.gov/
Creating directory www.weather.gov . . .
Unable to create directory www.weather.gov
http://www.cnn.com/
Creating directory www.cnn.com . . .

Code:

import java.io.*;
import java.lang.*;

public class create_directory
{
public static void main ( String[] args ) throws IOException
{
try
{
BufferedReader infile = new BufferedReader(new
FileReader("URLs.txt"));

String aURL, directory;

while ((aURL = infile.readLine()) != null)
{
         System.out.println(aURL);
        directory = (aURL.replace("http:","")).replace("/","");
        System.out.println("Creating directory " + directory + " . . .");
        try
        {
        if ((new File(directory).mkdir()) == false)
        System.out.println("Unable to create directory " + directory);
        }
        catch (SecurityException e) {e.printStackTrace();}
}
infile.close();
}
catch (IOException e) {e.printStackTrace();}
}

}

Reply to this Message

Alan - 08 Oct 2007 19:47 GMT

Strange . . . This happens under Windows Vista and Java SE JDK 1.6,
but it does not happen under Windows 98SE and JDK 1.5.

Alan

Reply to this Message

Andrew Thompson - 08 Oct 2007 19:52 GMT

>I`m trying to create a directory for each URL string read in from
>a file. However, one of the directories cannot be created, but the
>other can. Neither exist at the start. No exception occurs.
>
> Am I missing something obvious? (I have not used mkdir before.)

Your example failed to fail for me here. Both
directories were created, if I deleted them, I
could create them again.

OTOH - I could not resist tweaking your code..
It uses mkdirs() rather than mkdir(). (The 's' is
an important distinction.)

<sscce>
import java.io.*;
import java.lang.*;

public class DirectoryTree
{

public static void main ( String[] args )
{
try
{
BufferedReader infile =
new BufferedReader(new FileReader("URLs.txt"));

String aURL, directory;

while ((aURL = infile.readLine()) != null)
{
System.out.println(aURL);
directory = (aURL.replace("http:",""))
.replace("/","")
.replace(".","/");
String[] parts = directory.split("/");
File f = new File("cache");
for (int ii=parts.length-1; ii>-1; ii--)
{
f = new File( f, parts[ii] );
}
System.out.println(
"Creating directory " + f + " . . .");
try
{
// important to use makedirs for this variant!
if ((f.mkdirs()) == false)
{
System.out.println(
"Unable to create directory " + directory);
}
}
catch (SecurityException e)
{
e.printStackTrace();
}
}
infile.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
</sscce>

Signature

Andrew Thompson
http://www.athompson.info/andrew/

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Alan - 08 Oct 2007 20:56 GMT

Andrew,

What JDK version and operating system were you running this on?

Thanks, Alan

Reply to this Message

Alan - 08 Oct 2007 21:49 GMT

This is bizarre. The following URLs (converted to directory names
by code above) work, but "www.weather.gov" still does not! This
happens under Windows Vista, with either Java SE JDK 1.5 or 1.6. It
does NOT happen under Windows 98SE with JDK 1.5. WTF????

Anybody have any ideas what is going on? Thanks, Alan

http://www.brother.com
http://www.cnn.com
http://www.weathe.gov
http://www.weath.gov
http://www.weat.gov
http://www.wea.gov
http://www.we.gov
http://www.weather1.gov
http://www.weather12.gov
http://www.weather123.gov
http://www.weather1234.gov
http://www.weather12345.gov
1234567890
12345678901
123456789012
1234567890123
12345678901234
123456789012345
1234567890123456
12345678901234567
123456789012345678
1234567890123456789
12345678901234567890

Reply to this Message

Piotr Kobzda - 08 Oct 2007 22:47 GMT

> This is bizarre. The following URLs (converted to directory names
> by code above) work, but "www.weather.gov" still does not!

As a workaround, try to use "www.nws.noaa.gov" instead. ;-)

piotr

Reply to this Message

Alan - 09 Oct 2007 02:15 GMT

Does anyone else get this same result on Vista?

Reply to this Message

Alan - 09 Oct 2007 03:08 GMT

Does anyone else running Windows Vista have this problem?

Reply to this Message

Andrew Thompson - 09 Oct 2007 03:41 GMT

>> This is bizarre. The following URLs (converted to directory names
>> by code above) work, but "www.weather.gov" still does not!
>
>As a workaround, try to use "www.nws.noaa.gov" instead. ;-)

I think that is a good suggestion. Try .gov1 as well.

To answer an earlier question, I am using 1.6 on XP Pro.

As far as this problem goes, I have a sneaking suspicion
it /might/ be tied up with a recent bug that cropped up re
IE/Vista. That problem, though, affected IE/Vista & trusted
JWS & applets, Vista being the only one of which seems
immediately evident here.

Signature

Andrew Thompson
http://www.athompson.info/andrew/

Reply to this Message

Roedy Green - 09 Oct 2007 04:08 GMT

> This is bizarre. The following URLs (converted to directory names
>by code above) work, but "www.weather.gov" still does not! This
>happens under Windows Vista, with either Java SE JDK 1.5 or 1.6. It
>does NOT happen under Windows 98SE with JDK 1.5. WTF????

I ran Andrew's code with your list of URLS and all worked fine as
best as I could tell on Vista home premium .

I made one small modification. " == false" sets my teeth on edge, and
corrected a typo in the comment.

// important to use mkdirs for this variant!
if ( !f.mkdirs() )
{
System.out.println(
"Unable to create directory " +
directory);
}

http://www.brother.com
Creating directory cache\com\brother\www . . .
http://www.cnn.com
Creating directory cache\com\cnn\www . . .
http://www.weathe.gov
Creating directory cache\gov\weathe\www . . .
http://www.weath.gov
Creating directory cache\gov\weath\www . . .
http://www.weat.gov
Creating directory cache\gov\weat\www . . .
http://www.wea.gov
Creating directory cache\gov\wea\www . . .
http://www.we.gov
Creating directory cache\gov\we\www . . .
http://www.weather1.gov
Creating directory cache\gov\weather1\www . . .
http://www.weather12.gov
Creating directory cache\gov\weather12\www . . .
http://www.weather123.gov
Creating directory cache\gov\weather123\www . . .
http://www.weather1234.gov
Creating directory cache\gov\weather1234\www . . .
http://www.weather12345.gov
Creating directory cache\gov\weather12345\www . . .
1234567890
Creating directory cache\1234567890 . . .
12345678901
Creating directory cache\12345678901 . . .
123456789012
Creating directory cache\123456789012 . . .
1234567890123
Creating directory cache\1234567890123 . . .
12345678901234
Creating directory cache\12345678901234 . . .
123456789012345
Creating directory cache\123456789012345 . . .
1234567890123456
Creating directory cache\1234567890123456 . . .
12345678901234567
Creating directory cache\12345678901234567 . . .
123456789012345678
Creating directory cache\123456789012345678 . . .
1234567890123456789
Creating directory cache\1234567890123456789 . . .
12345678901234567890
Creating directory cache\12345678901234567890 . . .

Signature

Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

Reply to this Message

Alan - 09 Oct 2007 17:56 GMT

As far as this problem goes, I have a sneaking suspicion
it /might/ be tied up with a recent bug that cropped up re
IE/Vista. That problem, though, affected IE/Vista & trusted
JWS & applets, Vista being the only one of which seems
immediately evident here.

Andrew,

Do you have a web link that describes this problem? With Vista,
it seems to be: "So many problems, so little time."

Thanks for mentioning this. I have not found a reference to one
like this.

Roedy,
I watched with Explorer, but I saw nothing unusual there.

There are workarounds, but it is just perplexing and
frustrating.
Thanks, Alan

Reply to this Message

Andrew Thompson - 09 Oct 2007 18:22 GMT

(A.T.)

>As far as this problem goes, I have a sneaking suspicion
>it /might/ be tied up with a recent bug that cropped up re
>IE/Vista. That problem, though, affected IE/Vista & trusted
>JWS & applets, Vista being the only one of which seems
>immediately evident here.

Alan

> Do you have a web link that describes this problem?

OK, just quickly, it was something to do with
Vista and files, ..
<http://www.google.com/search?as_q=vista+file&as_sitesearch=bugs.sun.com>

This is probably the one.
"Bug ID: 6548078 The Java Security Model is broken on Windows Vista ..."
<http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6548078>

Signature

Andrew Thompson
http://www.athompson.info/andrew/

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Alan - 09 Oct 2007 20:20 GMT

This one sounds even closer, although not exactly the same:

File operation report wrong success flag when run with UAC turned on
(win)

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6572244

Reply to this Message

Alan - 10 Oct 2007 19:28 GMT

Well, I found the problem. Windows Vista does not like it when I
try to make a directory with the same name (without extension) as a
different type file (e.g., "www.weather.gov" (HTML file) or
"www.weather.gov (Word file)). Windows 98 does not mind. Vista
handles extensions differently.

I found that if I first check to see if the directory already
exists, and then create it if not, everything works fine! So,
something screwy in JDK on Vista must be happening when I try
"mkdirs()" without checking the existence first. Odd. . . .

Alan

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Lew - 11 Oct 2007 07:15 GMT

> Well, I found the problem. Windows Vista does not like it when I
> try to make a directory with the same name (without extension) as a
> different type file (e.g., "www.weather.gov" (HTML file) or
> "www.weather.gov (Word file)). Windows 98 does not mind. Vista
> handles extensions differently.

Comparing anything to how Win 98 works is pretty amusing.

Signature

Lew

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Roedy Green - 11 Oct 2007 21:37 GMT

> I found that if I first check to see if the directory already
>exists, and then create it if not, everything works fine! So,
>something screwy in JDK on Vista must be happening when I try
>"mkdirs()" without checking the existence first. Odd. . . .

mkdirs takes a while to do its job. If you check existence afterward,
you might not see its result. That may have some bearing on this
strange behaviour.

Signature

Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

Reply to this Message

Roedy Green - 09 Oct 2007 03:55 GMT

> Am I missing something obvious?

The usual problems are:

1. the directory already exists.

2. there is a file already by that name.

3. you are trying to create a directory when the parent does not yet
exist. Use mkdirs with an s to create parents automatically.

Go a have a peek with explorer to see what is going on.

Signature

Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

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