Exception in thread "main" java.lang.Error

Question

I'm beginning to learn Java. While following a YouTube tutorial, I entered the following code:

import java.util.Scanner;


public class ageclass {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        Scanner in = new Scanner(System.in);
        int age;
        System.out.println("How older are you?");
        age=in.nextInt();
        if (age >= 18)
            System.out.println("you are old enough to drink");
        else
            System.out.println("you are not old enough");
    }
}

The code threw this error:

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
    at age.ageclass.main(ageclass.java:6)

I have looked at another thread that had an answer but I couldn't understand it. Could someone explain to me what has gone wrong?

What does the tutorial say? Go review the actual source code. — Sotirios Delimanolis
– Sotirios Delimanolis, Commented Feb 10, 2014 at 22:06
Could you post a link to the YouTube tutorial? And post a link to the other thread which had the answer you could not understand? Through which methods are you trying to compile and execute the code (i.e., command-line, IDE like Eclipse, etc)? — user44484
– user44484, Commented Feb 10, 2014 at 22:11
@ Sotirios Delimanolis the tutorial doesn't say anything about the error, I read the comments and no one seemed to have this problem (or well didn't post a comment about it) here is the URL youtube.com/watch?v=Cfd9DOnuF9w @Dan I am using Eclipse, I was under the impression it complies it on the fly? EDIT : here is a link to the thread stackoverflow.com/questions/21688858/… — user3294775
– user3294775, Commented Feb 10, 2014 at 22:14
I think in Eclipse you have to tell it to compile before running. I believe that's under the Build menu? But I remember this from over 5 years ago and it may have changed. — user44484
– user44484, Commented Feb 10, 2014 at 22:19

Murillo Maia · Accepted Answer · 2014-02-10 22:08:50Z

2

if you are using eclipse try to clean the project.

Project -> Clean... -> select your project -> OK

answered Feb 10, 2014 at 22:08

Murillo Maia

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3 Comments

user44484 Over a year ago

The user appears to be a novice at Java. Can you explain to them why this might help?

user3294775 Over a year ago

I did this and it still comes back with the error, but I am intrested in why this would help (for future reference)

Murillo Maia Over a year ago

When you clean your project, eclipse remove the artifacts of your project. plus... if you have the auto-build turned on, eclipse will compile your project again.

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