Cannot get simple command line project to compile or run

Please see https://stackoverflow.com/a/42660624/104891.

The last item is likely the case: https://youtrack.jetbrains.com/issue/IDEA-184561.

I closed and reopened my project (called Inputer) and IDEA gave me an event log saying that it could not load Inputer.iml.  Indeed, that file does not exist.  How do I fix this?

Please check the modules configuration, there should be a Java module with the content and source roots.

If the module doesn't exist or is not valid, create a new one: https://www.jetbrains.com/help/idea/creating-and-managing-modules.html#add-new-module . Then configure the roots: https://www.jetbrains.com/help/idea/configuring-content-roots.html .

If it's a Maven or Gradle project import it from pom.xml/build.gradle instead.

I have done the above and everything else I can think of.  There is still no "out" folder, no .class files in the project, and of course, I cannot run the project.  

/usr/lib/jvm/java-11-openjdk-amd64/bin/java -javaagent:/home/knute/idea/idea-IC-192.6603.28/lib/idea_rt.jar=41061:/home/knute/idea/idea-IC-192.6603.28/bin -Dfile.encoding=UTF-8 net.snortum.inputer.InputerPlay
Error: Could not find or load main class net.snortum.inputer.InputerPlay
Caused by: java.lang.ClassNotFoundException: net.snortum.inputer.InputerPlay

Process finished with exit code 1

Please share the sample project and the logs (Help | Collect Logs and Diagnostic Data), zip and upload the file at https://uploads.services.jetbrains.com/ and provide the name here.

Okay, they're uploaded as

idea-logs-knute.zip

These are the logs, please share the project as well.

Okay, they're uploaded as idea-project-knute.zip

Try creating Inputer.iml file in the project root directory with the following contents:

<?xml version="1.0" encoding="UTF-8"?>
<module type="JAVA_MODULE" version="4">
  <component name="NewModuleRootManager" inherit-compiler-output="true">
    <exclude-output />
    <content url="file://$MODULE_DIR$">
      <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
    </content>
    <orderEntry type="inheritedJdk" />
    <orderEntry type="sourceFolder" forTests="false" />
  </component>
</module>

That did it, thanks!

Do you know what I did wrong, if anything?  I'm planning on importing several projects from git repos and I want to do it correctly. 

Not sure what has caused the problem. The module was missing for some reason. Creating a new module solved the problem: