InvalidModuleDescriptorException when running my first java app

Question

I have started learning Java and encountered a problem when trying to run my first program as given below:

public class HelloWorld {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
     System.out.println("Hello world!");
    }
}

On Eclipse Photon I encounter this error when running it:

 Error occurred during initialization of boot layer
    java.lang.module.FindException: Error reading module: C:\Users\Thomas\eclipse-workspace\HelloWorld\bin
    Caused by: java.lang.module.InvalidModuleDescriptorException: HelloWorld.class found in top-level directory (unnamed package not allowed in module)

I looked and there is my .class file in bin directory and my .java in the src directory.

Is that normal? How do I fix that?

Solution 1

I was getting the same error. Deleting the module-info.java file solved it for me.

Solution 2

It seems that you haven't created a package. My usual procedure in Eclipse is:

• Create a new Java project
• Inside that project: Create a new package
• Inside that package: Create a new Java class

Eclipse will help you a lot with the settings. Then just copy your code into that class and hit the 'start' button.

Solution 3

by removing module class problem solved for me in eclipse