Determining from Where a Class Was Loaded : Class Loader « Reflection « Java Tutorial

1. Java Tutorial
2. Reflection
3. Class Loader

import java.net.URL;
import java.security.CodeSource;
import java.security.ProtectionDomain;

public class Main {
  public Main() {
    Class cls = this.getClass();
    ProtectionDomain pDomain = cls.getProtectionDomain();
    CodeSource cSource = pDomain.getCodeSource();
    URL loc = cSource.getLocation();

  }

  public static void main(String[] argv) throws Exception {

  }
}