Java + Json - ClassNotFoundDefError [duplicate]

I'm trying to get an program that I coded to run properly. So far it will javac and java fine, however I get a NoClassDefFoundError.

This screenshot shows how I've javac, java the program, and the command prompt report. As you can see I have 3 source files, and therefore 3 classes. PeriodicTable doesn't do anything related to the issue.

Inside of class Table I have...

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.json.JsonArray;
import javax.json.JsonObject;

import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Color;
import java.awt.Toolkit;
import java.awt.Dimension;

import java.io.IOException;

class Table {
    //Predefining some global variables
    DataBaseReader dbReader;
    //some methods...
    protected void showLayout() {
        dbReader = new DataBaseReader();
        //A few lines of code
        try {
            JsonArray elements = dbReader.readDataBase(); //Here it enters the DataBaseReader class through dbReader
            //Some more code
        } catch(IOException ioe) {
            ioe.printStackTrace();
        }
    }
}

Here is my DataBaseReader class

import javax.json.Json;
import javax.json.JsonReader;
import javax.json.JsonObject;
import javax.json.JsonArray;
import java.io.FileReader;
import java.io.IOException;

public class DataBaseReader
{
public JsonArray readDataBase() throws IOException {    
    System.out.println("Check!"); //This check is reached
    JsonReader reader = Json.createReader(new FileReader("C:/projects/PeriodicTable/Elements.JSON"));
    System.out.println("Check!"); //This check is not reached
    JsonObject jsonst = reader.readObject();
    reader.close();
    return jsonst.getJsonArray("Elements"); 
}
}

What versions, programs, etc am I using?

Java 8

Command Prompt

Notepad

javax.json-1.0.jar

To clearly state my question... Any ideas or explanations about what is causing this error?