Home/ Questions/Error: ''error: could not find or load main class java'' - How to fix it?
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domenicalindgren
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Asked: 2022-06-09T00:20:33+00:00 In:

Error: ”error: could not find or load main class java” – How to fix it?

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Hello everyone. I am having a problem with ”error: could not find or load main class java” and I want to ask for your help. While I am running this program:

package com.baeldung;

public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello world..!!!");
}
}

I get this error:

$ java HelloWorld
Error: Could not find or load main class java

I don’t know the why this error appears and what is the best solution for it? Does anyone have suggestions for me? Please write below. Thanks a lot!

could not find or load main class java
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1 Answer

  1. Best Answer
    Expert

    The cause:

    The name HelloWorld you are using is not a qualified name, its fully qualified name is  com.baeldung.HelloWorld. If you want to run a Java class that is a part of package, you must provide fully qualified name for it.

    Solution:

    First, you need to run your program from the com/baeldung directory:

    $ java com.baeldung.HelloWorld
Error: Could not find or load main class java


    When you use the fully qualified class name com.baeldung.HelloWorld, Java looks for the HelloWorld.class file in the com/baeldung directory, it will be under the directory where you are running the program.

    If you are already inside com/baeldung, Java still cannot find and run the HelloWorld program, you will needd to move back to the parent folder and run this command:

    $ java com.baeldung.HelloWorld
Hello world..!!!

    As you see, the error will disappear by this way.

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