make linux directory writable using bash command through java code

Question

I have a directory /webroot in my linux server. Which permission set is 771, that means 1 for others. But I want to make it 773 through java code which like is :

Process p1 = Runtime.getRuntime().exec("chmod 773 /webroot");

But it can not change the permission.

I also capture the error stream which is like as :

chmod: changing permissions of `/webroot/': Operation not permitted

I saw a nearly related post yesterday, but i could not find the appropriate answer. At this time, what can I do now?

Please any help.

If you dont mind, can you please let me know more details? I am totally new in linux server. — Pritom
– Pritom, Commented Dec 7, 2011 at 4:24

ziesemer · Accepted Answer · 2011-12-07 04:24:48Z

2

I think the error is pretty clear here. What user is your Java code running as? It most likely doesn't have permissions to run chmod on that directory.

Do a ls -l on that directory to see who it is owned by. Make sure that your Java code is running at that same user.

answered Dec 7, 2011 at 4:24

ziesemer

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5 Comments

Pritom Over a year ago

All permission are as follows : drwxrwx--x 9 root root 4096 Dec 7 09:47 webroot , But how I can run java code using root user?

ziesemer Over a year ago

I wouldn't recommend it. You may be able to use sudo. Otherwise, maybe this is an initial setup that you need to complete outside of Java.

Pritom Over a year ago

Hey I used Process p1 = Runtime.getRuntime().exec("sudo chmod 773 /webroot"); but it cant change directory permission and captured error stream is as follows: sudo: sorry, you must have a tty to run sudo

Ryan Fernandes Over a year ago

@Pritom its strange what you're trying to do - I'd suggest sticking with ziesemer's suggestions.. but if you really want to hammer away you'll need to edit the sudoers file and include a !requiretty for your user

Pritom Over a year ago

I am using tomcat6 and username is 'tomcat', now what could I add to my sudoers file???

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