Issues using jsonsimple with java(maven) in VScode-CodePudding

I am rather new to VSCode and maven and am trying to work with a JSON file in java, i found out about json simple and decided to try it but i just cant get it to work. The goal is to convert the json file (which contains a json array) into an object i can work with in java.

When i run the following code:

package pandemic;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

import org.json.simple.JSONArray;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;



public class Game {
    public static void main(String[] args) throws FileNotFoundException, IOException, ParseException {
        JSONParser parser = new JSONParser();
        FileReader reader = new FileReader(".\\jsonfiles\\cities.json");
        
        Object obj = parser.parse(reader);
        JSONArray citiesInfo = (JSONArray) obj;
        System.out.println(citiesInfo.get(1));
    }
}

I get this message:

Error: Unable to initialize main class pandemic.Game
Caused by: java.lang.NoClassDefFoundError: org/json/simple/parser/ParseException

I tried to use gson as well but got the same error. I even went as far as to do a clean install of a new jdk to make sure that isnt the issue. No luck. I checked my pom.xml many times and its the same as any example i have seen. Does anyone here know what i can do to fix this?

Edit: Have also tried updating the project and cleaning the java language and resetting the workspace.

CodePudding user response：

If your goal is to get it working, Why don't you ignore the ParseExeption file altogether ? Just try running the code with Generic Exceptions ? You can focus on the ParseException when you get some experience working with the code.

Remove import org.json.simple.parser.ParseException; and change public static void main(String[] args) throws FileNotFoundException, IOException, ParseException { to public static void main(String[] args) throws FileNotFoundException, IOException, Exception {

CodePudding user response：

When your project lacks needed dependency, java extension compiles .java file, then the error occurs. Add the following code in pom.xml, the extension Maven for java will rebuild project since it detects changes in pom.xml. After that, you may run .java file successfully.

    <dependency>
        <groupId>org.apache.clerezza.ext</groupId>
        <artifactId>org.json.simple</artifactId>
        <version>0.4</version>
    </dependency>