[FIXED] Getting java.lang.ClassNotFoundException when using package

Issue

I have a java file ComPac.java with the below code:

package com;
public class ComPac{
    public static void main(String[] args) {
        System.out.println("Hello World");
    }
}

The file is located at the path : /home/ec2-user/java_c

To compile this file, I ran javac Compac.java, and the class file was generated.

Now its turn to run the class file.

So I did java ComPac(screenshot below)

Understandably, I got the error Error: Could not find or load main class ComPac. Caused by: java.lang.NoClassDefFoundError: com/ComPac (wrong name: ComPac). This I am assuming is because the java file has the package com declared in it.

So instead I tried, java com.ComPac and expected it to work(screenshot below).

But I got the error: Error: Could not find or load main class com.ComPac. Caused by: java.lang.ClassNotFoundException: com.ComPac.

So how do I run this? and what exactly is the logic for running when it comes to packages in java?

Java used- openjdk version "11.0.8" 2020-07-14 LTS(AWS Corretto)

OS used- Amazon Linux 2

Solution

put the class in a folder called "com"

in a bash shell it's then:

$ java com/ComPac

(from the folder containing "com", not inside of "com")

Answered By - Chris
Answer Checked By - Timothy Miller (JavaFixing Admin)