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javajava-11javacompilerjava-package

Getting java.lang.ClassNotFoundException when using package

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.

enter image description here

Now its turn to run the class file.

So I did java ComPac(screenshot below)

java ComPac

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).

java com.ComPac

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")