[#6543] Improved example entitie

jOOQ-examples/jOOQ-jpa-example-entities/src/main/java/org/jooq/example/jpa/entity/Actor.java

@@ -64,6 +64,8 @@ public class Actor {
     @ManyToMany(fetch = LAZY, mappedBy = "actors", cascade = CascadeType.ALL)
     public Set<Film> films = new HashSet<>();
 
+    public Actor() {}
+
     public Actor(String firstName, String lastName) {
         this.firstName = firstName;
         this.lastName = lastName;

jOOQ-examples/jOOQ-jpa-example-entities/src/main/java/org/jooq/example/jpa/entity/Film.java

@@ -88,6 +88,8 @@ public class Film {
     @ManyToMany(fetch = LAZY, cascade = CascadeType.ALL)
     public Set<Actor> actors = new HashSet<>();
 
+    public Film() {}
+
     public Film(Title title, Language language, int length, Year releaseYear) {
         this.title = title;
         this.language = language;