<dependency>

            <groupId>org.openjdk.jol</groupId>

            <artifactId>jol-core</artifactId>

            <version>0.9</version>

        </dependency>    

public class JolTest {

    static class T{

        private int i = 10;

    }

    public static void main(String[] args) {

        T o = new T();

        String s = ClassLayout.parseInstance(o).toPrintable();

        System.out.println(s);

    }

}