Error: Module not specified (IntelliJ IDEA)

I was trying to execute a simple program in IntelliJ IDEA as a static web project. I'm newbie and I'm learning web development with Node.js. I took help from the official website of IntelliJ IDEA, but the error was same. Though, I configured the settings and Project structure also.

Error:

"C:\Program Files\Java\jdk1.8.0_91\bin\java" -Didea.launcher.port=7535 "-Didea.launcher.bin.path=C:\Program Files\JetBrains\IntelliJ IDEA 2016.1.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\JetBrains\IntelliJ IDEA 2016.1.2\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain ""
Exception in thread "main" java.lang.ClassNotFoundException: 
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:122)

Process finished with exit code 1

Snapshot of IDE

Please help me to sort out this problem. I'm digging out this problem since few days.

This is because the className value which you are passing as argument for
forName(String className) method is not found or doesn't exists, or you a re passing the wrong value as the class name. Here is also a link which could help you.

1. https://docs.oracle.com/javase/7/docs/api/java/lang/ClassNotFoundException.html
2. https://docs.oracle.com/javase/7/docs/api/java/lang/Class.html#forName(java.lang.String)

Update

Module not specified

According to the snapshot you have provided this problem is because you have not determined the app module of your project, so I suggest you to choose the app module from configuration. For example:

this is how I fix this issue
1.open my project structure

2.click module 3.click plus button 4.click import module，and find the module's pom
5.make sure you select the module you want to import,then next next finish:)

For IntelliJ IDEA 2019.3.4 (Ultimate Edition), the following worked for me:

1. Find the Environment variables for your project.
2. Specify, from the dropdowns, the values of "Use class path of module:" and "JRE" as in the attached screenshot.

I faced the exact issue of module not found and solved it by navigating to pom.xml file in file system of my project and opening it as a maven project in my intelliJIdea.

Then it has populated the sub modules for selection in the edit configurations window.

Faced the same issue. To solve it,

• I had to download and install the latest version of gradle using the comand line. $ sdk install gradle using the package manager or $ brew install gradle for mac. You might need to first install brew if not yet.
• Then I cleaned the project and restarted android studio and it worked.

This happened to me when I started to work with a colleque's project.

He was using jdk 12.0.2 .

If you are suspicious jdk difference might be the case (Your IDE complains about SDK, JDK etc.):

1. Download the appropriate jdk
2. Move new jdk to the folder of your choice. (I use C:\Program Files\Java)
3. On Intellij, click to the dropdown on top middle bar. Click Edit Configurations. Change jdk.
4. File -> Invalidate Caches and Restart.