'ClassNotFoundException under the same folder in Intellij

I'm calling a Words class in another java file run using Java 12. The structure of the folder is as followed. However, I got the ClassNotFoundException error. Could anyone help me figure out why? I know that I need a classpath for loadClass to work. How can I do that?

├── App
│   ├── Words.java
│   └── run.java
|   └── config.properties

public class run {
    public static void main(String[] args) {
        Properties config = new Properties();
        config.load(new BufferedReader(new FileReader("./config.properties")));
        URL pluginsDirUrl = Paths.get(config.getProperty("pluginDirection")).toUri().toURL();
        ClassLoader classLoader = new URLClassLoader(new URL[] { pluginsDirUrl }, 
        run.class.getClassLoader());
        String wordsProviderClassName = config.getProperty("words");
        wordsProviderClassName = removeTail(wordsProviderClassName); //remove the extension of java file e.g Words.java -> Words
        Class<?> wordsProviderClass = classLoader.loadClass(wordsProviderClassName);
    }
}

The following is my config.properties file

words = Words.java
pluginDirection = ./
java


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