Java - JSPF错误

Question

我在我的Java插件系统中使用JSPF框架。我收到了这个错误：

Adding plugins in 'raw' classpaths, such as 'bin/' or 'classes/' is not recommended. Please use classpath://* instead (the video is a bit outdated in this respect).

IPlugin.java

import net.xeoh.plugins.base.Plugin;

public interface IPlugin extends Plugin {
    public String handleStuff();
}

Test.java

import net.xeoh.plugins.base.annotations.PluginImplementation;

@PluginImplementation
public class Test implements IPlugin {
    public String handleStuff() {
        return ("Swag");
    }
}

Testing.java/Main class

import java.io.File;

import net.xeoh.plugins.base.PluginManager;
import net.xeoh.plugins.base.impl.PluginManagerFactory;

public class Testing {

    public static void main(String[] args) {
        PluginManager pm = PluginManagerFactory.createPluginManager();
        pm.addPluginsFrom(new File("bin/").toURI());

        IPlugin cool = pm.getPlugin(IPlugin.class);
        cool.handleStuff();
    }

}

请帮帮我