can not read file from linux system using java

Question

I am trying to read/write files on Ubuntu 12.04. I set permission of that directory by chmod -R 777 . But still when I call canRead() method on that directory it returns false.

my directory is /root/Temp

please help me to solve this problem

Code (copied from comments):

File xyz = new File("/root/Temp"); 
System.out.println("filename :"+xyz.getPath()); 
System.out.println("can read :"+xyz.canRead()); 
String[] children = xyz.list();

Children is null, output of can read is false.

For better help sooner, post your code as an SSCCE that demonstrates your problem. This allows users to copy/paste and reproduce your issue. Include in your example the shell commands you used to create the directory. — Duncan Jones
– Duncan Jones, Commented Aug 13, 2013 at 9:52
I've voted to re-open as we now have the code. Although it would be beneficial if you can still post the shell commands that construct your directory. — Duncan Jones
– Duncan Jones, Commented Aug 15, 2013 at 7:32
before specifying path give sudo..and try to pipe your password to the sudo command.. — Abhishek
– Abhishek, Commented Aug 15, 2013 at 8:01
I fired command with sudo but still its not giving permissions to read/write files using java — Laxmikant Kumbhare
– Laxmikant Kumbhare, Commented Aug 22, 2013 at 6:16

morgano · Accepted Answer · 2013-08-13 10:00:05Z

2

Are you running your program as root? it is not sufficient changing the permissions of /root/temp, if you are not the user root you wont be able to "go through" the dir /root unless you also change the permissions of the dir /root .

answered Aug 13, 2013 at 10:00

morgano

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6 Comments

Laxmikant Kumbhare Over a year ago

I am root user. and creating folder using sudo.

morgano Over a year ago

Can you post your code as suggested by @DuncanJones ? that way we could help you better

Laxmikant Kumbhare Over a year ago

code File xyz = new File("/root/Temp"); System.out.println("filename :"+xyz.getPath()); System.out.println("can read :"+xyz.canRead()); String[] children = xyz.list(); code children is null, output of can read is false.

boxed__l Over a year ago

@LaxmikantKumbhare What do you expect to read? Make sure Temp folder is not empty...

morgano Over a year ago

Works for me, using the code you posted as comment and running it as root. Your problem is elsewhere.

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AGalWhoHasNoName · Accepted Answer · 2020-05-04 03:14:43Z

0

I too faced the same while doing XML Parsing using Java SAX Parser. My file is not read by the java program. The mistake I done was, I didn't specify the file name correctly. After your /root/Temp you have to add some more details too. For example : /root/Temp/example.xml Then your program will work fine. Hope this helps!!

answered May 4, 2020 at 3:14

AGalWhoHasNoName

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