Test case to catch GWT serialization errors due to missing empty constructor

EntityTest.java

package org.example;

import java.util.Set;

import org.junit.Test;
import org.reflections.Reflections;

/*
Entity is something like this --> public interface Entity extends Serializable { }
*/

public class EntityTest {
    @Test
    public void ensureGWTSerializationRequirementsAreFulfilled() throws Exception {
        Reflections reflections = new Reflections("org.example");
        Set<Class<? extends Entity>> subTypes = reflections.getSubTypesOf(Entity.class);

        for (Class<? extends Entity> c : subTypes) {
            try {
                c.getDeclaredConstructor();
            } catch (NoSuchMethodException e) {
                throw new NoSuchMethodException("Class " + c.getName() + " doesn't have an empty constructor");
            }
        }
    }
}