IntelliJ IDEA is not recognizing my java files as runnable and instead wants to run the class files. Any ideas of how to fix?

Question

Anytime I try to run a java file by clicking run, it instead tries to run the class file and thus gives a no main method error.

When I try to right click on a java file and run that, it doesn't recogize it as a file that is runable.

I am still able to run programs from the command prompt but I would prefer to be able to run them in IntelliJ.

This occurred after trying to create a Class path when using JSon Libraries.

Edit:

Normally it shows java files with this icon:

But instead it's showing this icon for java files:

I think the change in icon might have something to do with it.

Edit 2: the exact error I get is "C:\\Program Files (x86)\\Java\\jdk1.8.0_181\\bin\\java.exe"...bunch of other program file locations

Error: Could not find or load main class sample.Main

Process finished with exit code 1

Answer 1

I had the same problem and found out that my src wasn't marked as Sources Root. To change this:

• right-mouse click on your src
• navigate to "Mark Directory As"
• choose "Sources Root" It will now recognize your files correctly and your main classes will be able to run again

IntelliJ not recognizing my .java-files

Problem solved

Answer 2

我重新启动了我的电脑，并以某种方式修复了它。

Answer 3

I had a similar problem.It wouldn't pick up ModlServer in any project.
(Not just limited to the one I had open).

I had to file -> Manage IDE Settings -> Restore Default Settings

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Note: I lost all my live templates, fonts, etc so just a heads up.

Answer 4

My issue was that I have multiple modules for my project and the module I was working on (where java files were not recognized) was not included in the main pom. I just added that module in the main (project) pom and it worked.

Answer 5

右键单击项目并单击“添加框架支持”，所有目录和类现在都应该是正确的类型。

Answer 6

If you are using Maven or Gradle, try to re-import the project and see if that helps. Could be that your IDEA project has some incorrect settings in it set by mistake, so this way those would be removed.