Error: Module not specified (IntelliJ IDEA)

Question

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.

Solution 1

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:

Solution 2

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:)

Solution 3

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.

Solution 4

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.

View more solutions

Comments

[Elham Kohestani]

this time I think there is no problem with configuring IDE.

[thedebuggger]

ok... module not specified what was that? I'm learning from this tutorials of node.js

[Elham Kohestani]

I provided an update check it I hope it may help you

[thedebuggger]

Somehow I'm making mistakes... Thanks a ton!! :)

[thedebuggger]

In the module classpath, I don't get the option... why?

[Elham Kohestani]

That maybe because of renaming the project, but I am not sure. Have you renamed your project?

[thedebuggger]

The blunder I was doing i.e: I hadn't installed the plugins. If anyone uses IntelliJ IDEA ultimate, you've to installed plugins otherwise download Webstorm. Webstorm doesn't need plugins. Tutorials for easy way to understand Node.js. :)

[thedebuggger]

Thanks a ton Elham... :)

[Elham Kohestani]

You are welcome. I hadn't known that you have not installed the plugin anyway good to know that you have found the solution.:)