Can't write to /opt through Java...

gliesian66 · 11-07-2015, 09:37 AM

(two questions)

This works fine on windows and Linux...

Files.createDirectories(Paths.get(/tmp/dir_name));

This does not:

Files.createDirectories(Paths.get(/opt/dir_name));

(1) Why?

What I do after this point is create user folders where they can upload files to.

(2) Is there a better more preferred place on Linux for this?

Thanks,
Robert

ButterflyMelissa · 11-07-2015, 09:49 AM

Hi,
Welcome to the forum. I hope this will be the one stop for all your questions on Linux...

You (or your program) may not have the rights to write in that folder...

Quote:

What I do after this point is create user folders where they can upload files to.

The prefered option may be to create a user and use the created folder/space as upload point...basically, this is what FTP does...
Unless there is a detail not yet mentioned here...
Melissa

273 · 11-07-2015, 09:55 AM

You can't write to /opt/ because it requires root permission to do so. That is because it is for the installing of optional applications (from outside of the distribution's repositories, for example) and not normal user data.
For specific users their files should be under /home/username otherwise you could perhaps create a folder under /var/, make it user writeable then put files there -- others may have better suggestions as to where to create the folder but /opt/ is not the right location.