java - Cannot get JSPF to work -

i'm creating complex (well me anyway haha) program in java , require simple/easy use plugin framework. stumbled across jspf, watched video , though great! takes less 5 minutes implement.

reading doc have created plugin interface extends plugin jspf. made simple "hello world" method. created test plugin class.

package main.plugin.impl;  import main.plugin.plugin; import net.xeoh.plugins.base.annotations.pluginimplementation;  /**  * created adam on 08/05/15.  */ @pluginimplementation public class testplugin implements plugin {     @override     public void helloworld() {         system.out.println("hello world");     } } 

the final step load plugin. here's main class.

package main;   import main.plugin.plugin; import net.xeoh.plugins.base.pluginmanager; import net.xeoh.plugins.base.impl.pluginmanagerfactory;  import java.io.file;  /**  * created adam on 08/05/15.  */ public class main {     public static void main(string[] args) {         pluginmanager pm = pluginmanagerfactory.createpluginmanager();         pm.addpluginsfrom(new file("src/").touri());          plugin p =  pm.getplugin(plugin.class);         p.helloworld();     } } 

according examples on jspf google code page, that's need do, , running.

however getting nullpointerexception on p.helloworld(); line.

i can see plugin isn't getting loaded, don't know how resolve issue. appreciated. thanks

edit : i've had success. if use

pm.addpluginsfrom(new uri("classpath://*")); 

it picks plugins , loads them. if use new file method , type exact path of class file, won't load. ideas?

edit 2 : figured out, had paths wrong. working fine now.