IntelliJ directories error class not found

Question

I'm fairly new to IntelliJ and I have tried making a hello world program in some other directory other than ~/IdeaProject. When I did so although my code is correct it gives me ClassNotFoundException. But when I copy the files into ~/IdeaProject and open the project from that directory, I can run it just fine and it isn't from my code since I tried different ones and I already uninstalled and installed IntelliJ and still got the same result anybody can tell me why? Any help is greatly appreciated!

Update: I can run my codes fine in all directories except a directory called: /Course Material/Week 2/Web Server: Reflection/ I can also run my program from command line in that directory and it works fine I suppose the problem is with IntelliJ.

 ~/U/S/I/C/W/W/untitled folder> ls out/ src/ untitled folder.iml ~/U/S/I/C/W/W/untitled folder> cd src/com/company/ ~/U/S/I/C/W/W/u/s/c/company> ls Main.java ~/U/S/I/C/W/W/u/s/c/company> javac Main.java ~/U/S/I/C/W/W/u/s/c/company> cd ../.. ~/U/S/I/C/W/W/u/src [1]> java com.company.Main write your code here

Does anybody have any idea why?

simple program in the stated directory

same program in the relative path ../

Depends on a lot of things, for example your project structure, project configuration, etc.. Posting a picture of your project's tree might help. For example are your classes under src/main/java? — Dropout
– Dropout, Commented Mar 8, 2021 at 11:27
I added the screen shot to the post. and yes i only have only class which is in src/main/java — kasra karaji
– kasra karaji, Commented Mar 8, 2021 at 12:10
Guessing, I am wondering if that : in the path creates a problem for this or that tool. — GhostCat
– GhostCat, Commented Mar 8, 2021 at 12:36
But as said, we lack the detail to really help. See minimal reproducible example. You somehow describing what you did isnt sufficient here. Details really matter. Worst case, give a step by step description of what you tried. But then, such kind of "help" is really hard. A real person looking at your screen and being able to run this or that command might be able to figure the issue in a few seconds. But remember: we only have what you tell us about. So ... rather look around, arent there any peers or tutors that you can talk with? — GhostCat
– GhostCat, Commented Mar 8, 2021 at 12:37
Well "/" is the directory separator on Mac Os. You cant use the "/" as part of a filename. — GhostCat
– GhostCat, Commented Mar 8, 2021 at 12:51

Dropout · Accepted Answer · 2021-03-08 13:07:53Z

Your project is not properly initialized and IntelliJ sees the classes as just plain files in ordinary folders and not as a project which classes interact with each other.

Start by creating a new project through File → New → Project, define your project in a way that suits your needs and after the setup is complete copy your classes under src/main/java. This is default, but basically your main classes need to be under a folder which is marked as "Sources Root". Afterwards you can also doublecheck if your SDK is configured properly (File → Project Structure → SDKs) and if you're using the correct language level in your project(File → Project Structure → Modules → Language Level).

kasra karaji · Accepted Answer · 2021-03-08 13:11:53Z

The problem was that I had a '/' (slash) in my file name which intelliJ replaced with ':' when I changed the slash the errors went away.

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