[utf8mb4-support] limited the size of all indexed string columns, as max key length on mysql/mariadb is 767 bytes (which are <= 191 chars on utf8mb4) (#1264)

src/test/java/org/tests/model/basic/Contact.java

@@ -13,6 +13,8 @@ import javax.persistence.Id;
 import javax.persistence.ManyToOne;
 import javax.persistence.OneToMany;
 import javax.persistence.Version;
+import javax.validation.constraints.Size;
+
 import java.sql.Timestamp;
 import java.util.List;
 
@@ -26,7 +28,10 @@ public class Contact {
   @Id
   int id;
 
+  @Size(max=127)
   String firstName;
+
+  @Size(max=127)
   String lastName;
 
   String phone;