diff --git a/src/main/java/core/basesyntax/dao/impl/CommentDaoImpl.java b/src/main/java/core/basesyntax/dao/impl/CommentDaoImpl.java
index 5176c951f..440ac1da1 100644
--- a/src/main/java/core/basesyntax/dao/impl/CommentDaoImpl.java
+++ b/src/main/java/core/basesyntax/dao/impl/CommentDaoImpl.java
@@ -2,8 +2,11 @@
 
 import core.basesyntax.dao.CommentDao;
 import core.basesyntax.model.Comment;
+import jakarta.persistence.EntityNotFoundException;
 import java.util.List;
+import org.hibernate.Session;
 import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
 
 public class CommentDaoImpl extends AbstractDao implements CommentDao {
     public CommentDaoImpl(SessionFactory sessionFactory) {
@@ -12,21 +15,62 @@ public CommentDaoImpl(SessionFactory sessionFactory) {
 
     @Override
     public Comment create(Comment entity) {
-        return null;
+        Session session = null;
+        Transaction transaction = null;
+        try {
+            session = factory.openSession();
+            transaction = session.beginTransaction();
+            session.persist(entity);
+            transaction.commit();
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new RuntimeException("Can't note save Comment to the DB" + entity, e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
+        return entity;
     }
 
     @Override
     public Comment get(Long id) {
-        return null;
+        try (Session session = factory.openSession()) {
+            return session.get(Comment.class, id);
+        } catch (Exception e) {
+            throw new EntityNotFoundException("Can't not get comment by id: " + id, e);
+        }
     }
 
     @Override
     public List<Comment> getAll() {
-        return null;
+        Session session = null;
+        try {
+            session = factory.openSession();
+            return session.createQuery("from Comment", Comment.class).list();
+        } catch (Exception e) {
+            throw new RuntimeException("Failed to get all Comment", e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
     }
 
     @Override
     public void remove(Comment entity) {
-
+        Transaction transaction = null;
+        try (Session session = factory.openSession()) {
+            transaction = session.beginTransaction();
+            session.remove(entity);
+            transaction.commit();
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new RuntimeException("Can't not remove the Comment: " + entity, e);
+        }
     }
 }
diff --git a/src/main/java/core/basesyntax/dao/impl/MessageDaoImpl.java b/src/main/java/core/basesyntax/dao/impl/MessageDaoImpl.java
index 9b899fa95..9ae16f7fc 100644
--- a/src/main/java/core/basesyntax/dao/impl/MessageDaoImpl.java
+++ b/src/main/java/core/basesyntax/dao/impl/MessageDaoImpl.java
@@ -2,8 +2,11 @@
 
 import core.basesyntax.dao.MessageDao;
 import core.basesyntax.model.Message;
+import jakarta.persistence.EntityNotFoundException;
 import java.util.List;
+import org.hibernate.Session;
 import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
 
 public class MessageDaoImpl extends AbstractDao implements MessageDao {
     public MessageDaoImpl(SessionFactory sessionFactory) {
@@ -12,21 +15,62 @@ public MessageDaoImpl(SessionFactory sessionFactory) {
 
     @Override
     public Message create(Message entity) {
-        return null;
+        Session session = null;
+        Transaction transaction = null;
+        try {
+            session = factory.openSession();
+            transaction = session.beginTransaction();
+            session.persist(entity);
+            transaction.commit();
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new RuntimeException("Can't not save Massage to the DB: " + entity, e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
+        return entity;
     }
 
     @Override
     public Message get(Long id) {
-        return null;
+        try (Session session = factory.openSession()) {
+            return session.get(Message.class, id);
+        } catch (Exception e) {
+            throw new EntityNotFoundException("Can't not get Message from DB: " + id, e);
+        }
     }
 
     @Override
     public List<Message> getAll() {
-        return null;
+        Session session = null;
+        try {
+            session = factory.openSession();
+            return session.createQuery("from Message", Message.class).list();
+        } catch (Exception e) {
+            throw new RuntimeException("Failed to get all Message", e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
     }
 
     @Override
     public void remove(Message entity) {
-
+        Transaction transaction = null;
+        try (Session session = factory.openSession()) {
+            transaction = session.beginTransaction();
+            session.remove(entity);
+            transaction.commit();
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new RuntimeException("Failed to remove Message from Db: " + entity, e);
+        }
     }
 }
diff --git a/src/main/java/core/basesyntax/dao/impl/MessageDetailsDaoImpl.java b/src/main/java/core/basesyntax/dao/impl/MessageDetailsDaoImpl.java
index fb96d35aa..7d75bf932 100644
--- a/src/main/java/core/basesyntax/dao/impl/MessageDetailsDaoImpl.java
+++ b/src/main/java/core/basesyntax/dao/impl/MessageDetailsDaoImpl.java
@@ -2,7 +2,10 @@
 
 import core.basesyntax.dao.MessageDetailsDao;
 import core.basesyntax.model.MessageDetails;
+import jakarta.persistence.EntityNotFoundException;
+import org.hibernate.Session;
 import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
 
 public class MessageDetailsDaoImpl extends AbstractDao implements MessageDetailsDao {
     public MessageDetailsDaoImpl(SessionFactory sessionFactory) {
@@ -11,11 +14,32 @@ public MessageDetailsDaoImpl(SessionFactory sessionFactory) {
 
     @Override
     public MessageDetails create(MessageDetails entity) {
-        return null;
+        Session session = null;
+        Transaction transaction = null;
+        try {
+            session = factory.openSession();
+            transaction = session.beginTransaction();
+            session.persist(entity);
+            transaction.commit();
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new RuntimeException("Can't not save MessageDetails: " + entity, e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
+        return entity;
     }
 
     @Override
     public MessageDetails get(Long id) {
-        return null;
+        try (Session session = factory.openSession()) {
+            return session.get(MessageDetails.class, id);
+        } catch (Exception e) {
+            throw new EntityNotFoundException("Can't not get MessageDetails by id: " + id, e);
+        }
     }
 }
diff --git a/src/main/java/core/basesyntax/dao/impl/SmileDaoImpl.java b/src/main/java/core/basesyntax/dao/impl/SmileDaoImpl.java
index 559248cda..54d2db885 100644
--- a/src/main/java/core/basesyntax/dao/impl/SmileDaoImpl.java
+++ b/src/main/java/core/basesyntax/dao/impl/SmileDaoImpl.java
@@ -2,8 +2,11 @@
 
 import core.basesyntax.dao.SmileDao;
 import core.basesyntax.model.Smile;
+import jakarta.persistence.EntityNotFoundException;
 import java.util.List;
+import org.hibernate.Session;
 import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
 
 public class SmileDaoImpl extends AbstractDao implements SmileDao {
     public SmileDaoImpl(SessionFactory sessionFactory) {
@@ -12,16 +15,47 @@ public SmileDaoImpl(SessionFactory sessionFactory) {
 
     @Override
     public Smile create(Smile entity) {
-        return null;
+        Session session = null;
+        Transaction transaction = null;
+        try {
+            session = factory.openSession();
+            transaction = session.beginTransaction();
+            session.persist(entity);
+            transaction.commit();
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new RuntimeException("Can't not save smile:" + entity, e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
+        return entity;
     }
 
     @Override
     public Smile get(Long id) {
-        return null;
+        try (Session session = factory.openSession()) {
+            return session.get(Smile.class, id);
+        } catch (Exception e) {
+            throw new EntityNotFoundException("Can't teg smile by id: " + id, e);
+        }
     }
 
     @Override
     public List<Smile> getAll() {
-        return null;
+        Session session = null;
+        try {
+            session = factory.openSession();
+            return session.createQuery("from Smile", Smile.class).list();
+        } catch (Exception e) {
+            throw new RuntimeException("Failed to get all smiles", e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
     }
 }
diff --git a/src/main/java/core/basesyntax/dao/impl/UserDaoImpl.java b/src/main/java/core/basesyntax/dao/impl/UserDaoImpl.java
index 338d8248b..5e7deab61 100644
--- a/src/main/java/core/basesyntax/dao/impl/UserDaoImpl.java
+++ b/src/main/java/core/basesyntax/dao/impl/UserDaoImpl.java
@@ -2,8 +2,11 @@
 
 import core.basesyntax.dao.UserDao;
 import core.basesyntax.model.User;
+import jakarta.persistence.EntityNotFoundException;
 import java.util.List;
+import org.hibernate.Session;
 import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
 
 public class UserDaoImpl extends AbstractDao implements UserDao {
     public UserDaoImpl(SessionFactory sessionFactory) {
@@ -12,21 +15,64 @@ public UserDaoImpl(SessionFactory sessionFactory) {
 
     @Override
     public User create(User entity) {
-        return null;
+        Session session = null;
+        Transaction transaction = null;
+        try {
+            session = factory.openSession();
+            transaction = session.beginTransaction();
+            session.persist(entity);
+            transaction.commit();
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new RuntimeException("Can't save user to the DB:"
+                    + entity, e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
+        return entity;
     }
 
     @Override
     public User get(Long id) {
-        return null;
+        try (Session session = factory.openSession()) {
+            return session.get(User.class,id);
+        } catch (Exception e) {
+            throw new EntityNotFoundException("Can't get user by id: "
+                    + id, e);
+        }
     }
 
     @Override
     public List<User> getAll() {
-        return null;
+        Session session = null;
+        try {
+            session = factory.openSession();
+            return session.createQuery("from User", User.class).list();
+        } catch (Exception e) {
+            throw new RuntimeException("Failed to get all users", e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
     }
 
     @Override
     public void remove(User entity) {
-
+        Transaction transaction = null;
+        try (Session session = factory.openSession()) {
+            transaction = session.beginTransaction();
+            session.remove(entity);
+            transaction.commit();
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new RuntimeException("Failed to remove user from DB: " + entity, e);
+        }
     }
 }
diff --git a/src/main/java/core/basesyntax/model/Comment.java b/src/main/java/core/basesyntax/model/Comment.java
index 9fba0c920..d0a1d0c5d 100644
--- a/src/main/java/core/basesyntax/model/Comment.java
+++ b/src/main/java/core/basesyntax/model/Comment.java
@@ -1,15 +1,23 @@
 package core.basesyntax.model;
 
+import jakarta.persistence.Entity;
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToMany;
+import jakarta.persistence.Table;
 import java.util.List;
 
+@Entity
+@Table(name = "comments")
 public class Comment {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
     private String content;
+    @ManyToMany
+    @JoinColumn(name = "comment_id")
     private List<Smile> smiles;
 
     public Long getId() {
diff --git a/src/main/java/core/basesyntax/model/Message.java b/src/main/java/core/basesyntax/model/Message.java
index 672b5d485..7518e77cd 100644
--- a/src/main/java/core/basesyntax/model/Message.java
+++ b/src/main/java/core/basesyntax/model/Message.java
@@ -1,8 +1,26 @@
 package core.basesyntax.model;
 
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.JoinTable;
+import jakarta.persistence.OneToOne;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name = "messages")
 public class Message {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
     private String content;
+    @OneToOne(cascade = {CascadeType.PERSIST, CascadeType.REMOVE})
+    @JoinTable(name = "message_details",
+            joinColumns = @JoinColumn(name = "message"),
+            inverseJoinColumns = @JoinColumn(name = "details"))
     private MessageDetails messageDetails;
 
     public Long getId() {
diff --git a/src/main/java/core/basesyntax/model/MessageDetails.java b/src/main/java/core/basesyntax/model/MessageDetails.java
index 185023dd5..fc948b071 100644
--- a/src/main/java/core/basesyntax/model/MessageDetails.java
+++ b/src/main/java/core/basesyntax/model/MessageDetails.java
@@ -1,8 +1,17 @@
 package core.basesyntax.model;
 
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
 import java.time.LocalDateTime;
 
+@Entity
+@Table(name = "massage details")
 public class MessageDetails {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
     private String sender;
     private LocalDateTime sentTime;
diff --git a/src/main/java/core/basesyntax/model/Smile.java b/src/main/java/core/basesyntax/model/Smile.java
index 4395eb0f7..35f80d8db 100644
--- a/src/main/java/core/basesyntax/model/Smile.java
+++ b/src/main/java/core/basesyntax/model/Smile.java
@@ -4,8 +4,10 @@
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
+import jakarta.persistence.Table;
 
 @Entity
+@Table(name = "smile")
 public class Smile {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
diff --git a/src/main/java/core/basesyntax/model/User.java b/src/main/java/core/basesyntax/model/User.java
index 0141eef00..492b3136a 100644
--- a/src/main/java/core/basesyntax/model/User.java
+++ b/src/main/java/core/basesyntax/model/User.java
@@ -1,10 +1,25 @@
 package core.basesyntax.model;
 
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.Table;
 import java.util.List;
 
+@Entity
+@Table(name = "users")
 public class User {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
     private String username;
+    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.PERSIST)
+    @JoinColumn(name = "user_id")
     private List<Comment> comments;
 
     public Long getId() {