"The type javax.swing.JFrame is not accessible" What does this mean and how do I fix it?

Question

I'm following along with this tutorial, and I got a problem early in the video (at approximately 7:45). I'm trying to create a basic Java program that will launch a window, however, I can't seem to import JFrame.

I've looked for other solutions on Stack Overflow, but I haven't found one that works for me.

Here is the code I've written:

import javax.swing.JFrame;

public class App {

    public static void main(String[] args) {

        JFrame frame = new JFrame("Hello World");

        frame.setVisible(true);

    }

}

I'm using Eclipse version 4.12.0 on a Macbook Pro (13-inch, Mid 2012) running macOS Mojave version 10.14.5

Expected result: A window opens when I run the program, and when I close the window, the program ends.

Actual result: No window is created and I get this error message:

Error occurred during initialization of boot layer
java.lang.module.FindException: Error reading module: /Users/username/eclipse-workspace/Swing1/bin
Caused by: java.lang.module.InvalidModuleDescriptorException: App.class found in top-level directory (unnamed package not allowed in module)

please post your package structure. My guess is that your App.class is not in a package. Put it in one. — Toerktumlare, Jul 24 '19 at 19:56
I'm a beginner so I don't really know what a package structure is. What is it and how can I post it? — Peter-Andre, Jul 24 '19 at 20:08
Does this answer your question? [Unable to import javax.swing.JFrame](https://stackoverflow.com/questions/23209125/unable-to-import-javax-swing-jframe) — keuleJ, Dec 26 '22 at 16:36

score 3 · Answer 1 · answered Feb 05 '22 at 00:33

3

If you have a module-info.java file, put this in the module:

requires java.desktop;

answered Feb 05 '22 at 00:33

TheWaterWave222

137
12

score 1 · Answer 2 · answered Jul 24 '19 at 20:17

If you have created the java app with eclipse your fault is the package.

With eclipse, I created a java app and this is the result

This code fixed your foult

package demo;

import java.awt.Dimension;

import javax.swing.JFrame;

public class App {

    public static void main(String[] args) {

        JFrame frame = new JFrame("Hello World");

        frame.setLocationRelativeTo(null);
        frame.setSize(new Dimension(400, 400));
        frame.setVisible(true);

    }

}

The reference for understand the package

Mojtaba Mohammadi · Answer 3 · 2020-06-20T23:41:32.377

I had the same issue. I did similar code in Eclipse. I got the error The type javax.swing.JFrame is not accessible on the side of import javax.swing.JFrame; The solution is: Delete the line of import javax.swing.JFrame; And then, inside your body of your code inside your main, with your mouse, hover over JFrame keyword, and Eclipse will offer some auto-completion suggestion. Select import 'JFrame' (javax.swing) This will bring the required import automatically. It is a kind of shortcut. In order to avoid these type of errors: Never type manually, get the imports AND methods, for example setVisible by autofilling. For instance, type frame.setV and again Eclipse will suggest the completion ... select from there. I do not know why, but this is what happened in my case.

"The type javax.swing.JFrame is not accessible" What does this mean and how do I fix it?

3 Answers3