I am trying to make a Java app that can load plugins implementing an abstract class and am having an AbstractMethodError with the instances generated from ServiceLoader. The code is a bit heavy so I've made a simplification below.
First, I have an abstract class:
package stuff.TheAbstractClass;
public abstract class TheAbstractClass implements ClassInterface{
//Stuff happens
}
Which implements the below interface:
package stuff.ClassInterface;
public interface ClassInterface {
public String getClassName();
}
I have a service provider NotAbstractClass which extends TheAbstractClass and states so in a meta-inf/services folder:
package anotherstuff.NotAbstractClass;
public final class NotAbstractClass extends TheAbstractClass implements ClassInterface{
private String name = "Silent Bob";
@Override
public String getClassName() { return name; }
}
Then on the main application (which is actually a plugin inside another application), I want to find all classes which extend TheAbstractClass:
package stuff.TheApp;
import java.util.ServiceLoader;
public class TheApp {
private String name;
public final static TheApp INSTANCE = new TheApp();
private TheApp() {
ServiceLoader<TheAbstractClass> serviceLoader =
ServiceLoader.load(TheAbstractClass.class);
for (TheAbstractClass class: serviceLoader) {
name = class.getClassName;
}
}
My application does find NotAbstractClass. I know this since, in the for loop, I can do class.getName() and it'll give me anotherstuff.NotAbstractClass) but gives the error:
java.lang.AbstractMethodError: stuff.TheAbstractClass.getClassName()Ljava/lang/String;
I'm stumped. Any suggestion? Thank you, Pedro
