how to stop intellij from deleting imports like "import javax.servlet.http.*;"? [duplicate]

Question

I'm working with intelliJ and my problem is when I start to import some temporary unused packages into my class file intellij delete those line within a second.

how can I turn off this not so nice feature?

Answer 1

Disable File | Settings | Editor | General | Auto Import | Optimize imports on the fly.

Normally you don't need to add imports manually, IDEA does it for you.

Answer 2

For Scala developers: you can have enabled

Settings > Editor > General > Auto Import > Optimize imports on the fly

but add exclusions into

Settings > Editor > Code Style > Scala > Imports always marked as used: