diff --git a/apps/java-api/pom.xml b/apps/java-api/pom.xml
index 9099a0be..f9384ea8 100644
--- a/apps/java-api/pom.xml
+++ b/apps/java-api/pom.xml
@@ -18,6 +18,13 @@
 	</properties>
 	<dependencies>
 
+    <!-- Serialization -->
+    <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-core</artifactId>
+      <version>2.13.2</version>
+    </dependency>
+
     <!-- Metrics Prometheus -->
     <dependency>
       <groupId>io.micrometer</groupId>
diff --git a/apps/java-api/src/main/java/org/scoalaonline/api/model/Lecture.java b/apps/java-api/src/main/java/org/scoalaonline/api/model/Lecture.java
index b62b59d2..adf262e9 100644
--- a/apps/java-api/src/main/java/org/scoalaonline/api/model/Lecture.java
+++ b/apps/java-api/src/main/java/org/scoalaonline/api/model/Lecture.java
@@ -4,15 +4,28 @@
 import org.springframework.data.neo4j.core.schema.Id;
 import org.springframework.data.neo4j.core.schema.Node;
 import org.springframework.data.neo4j.core.schema.Property;
+import org.springframework.data.neo4j.core.schema.Relationship;
 import org.springframework.data.neo4j.core.support.UUIDStringGenerator;
 
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Objects;
 
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+
 /**
  * Represents the Lecture node from the graph database.
  * It contains a title property.
  */
 @Node("Lecture")
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+// @Builder
 public class Lecture {
 
   @Id
@@ -21,12 +34,9 @@ public class Lecture {
 
   @Property("title")
   private String title;
-  //TODO: add @Relationships
-
-  //region Constructors
-  public Lecture(){
-
-  }
+  
+  @Relationship(type = "HAS_MATERIAL", direction = Relationship.Direction.OUTGOING)
+  List<LectureMaterial> lectureMaterials;
 
   public Lecture(String id) {
     this.id = id;
@@ -35,41 +45,14 @@ public Lecture(String id) {
   public Lecture(String id, String title) {
     this.id = id;
     this.title = title;
-  }
-  //endregion
-
-  //region Getters
-  public String getId() {
-    return id;
-  }
-
-  public String getTitle() {
-    return title;
-  }
-  //endregion Getters
-
-  //region Setters
-  public void setId(String id) {
-    this.id = id;
-  }
-
-  public void setTitle(String title) {
-    this.title = title;
-  }
-  //endregion Setters
+  } 
 
-  //region Equals & Hashcode
-  @Override
-  public boolean equals(Object o) {
-    if (this == o) return true;
-    if (o == null || getClass() != o.getClass()) return false;
-    Lecture lecture = (Lecture) o;
-    return Objects.equals(getId(), lecture.id) && Objects.equals(getTitle(), lecture.title);
+  public List<LectureMaterial> getLectureMaterials() {
+    return new ArrayList<>(lectureMaterials);
   }
 
-  @Override
-  public int hashCode() {
-    return Objects.hash(getId(), getTitle());
+  //List won't update
+  public void setLectureMaterials(List<LectureMaterial> lectureMaterials) {
+    this.lectureMaterials = new ArrayList<>(lectureMaterials);
   }
-  //endregion
 }
diff --git a/apps/java-api/src/main/java/org/scoalaonline/api/model/LectureMaterial.java b/apps/java-api/src/main/java/org/scoalaonline/api/model/LectureMaterial.java
index d4bf09d2..48529241 100644
--- a/apps/java-api/src/main/java/org/scoalaonline/api/model/LectureMaterial.java
+++ b/apps/java-api/src/main/java/org/scoalaonline/api/model/LectureMaterial.java
@@ -22,7 +22,7 @@ public class LectureMaterial {
   private String document;
 
   //@Relationships
-
+  
   //region Constructors
   public LectureMaterial(){}
 
diff --git a/apps/java-api/src/main/java/org/scoalaonline/api/service/LectureService.java b/apps/java-api/src/main/java/org/scoalaonline/api/service/LectureService.java
index 2c487c93..64ac452e 100644
--- a/apps/java-api/src/main/java/org/scoalaonline/api/service/LectureService.java
+++ b/apps/java-api/src/main/java/org/scoalaonline/api/service/LectureService.java
@@ -3,11 +3,15 @@
 
 import org.scoalaonline.api.exception.lecture.LectureInvalidTitleException;
 import org.scoalaonline.api.exception.lecture.LectureNotFoundException;
+import org.scoalaonline.api.exception.lectureMaterial.LectureMaterialNotFoundException;
 import org.scoalaonline.api.model.Lecture;
+import org.scoalaonline.api.model.LectureMaterial;
+import org.scoalaonline.api.repository.LectureMaterialRepository;
 import org.scoalaonline.api.repository.LectureRepository;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -19,6 +23,8 @@ public class LectureService implements ServiceInterface<Lecture> {
   @Autowired
   LectureRepository lectureRepository;
 
+  @Autowired
+  LectureMaterialRepository lectureMaterialRepository;
   /**
    * Retrieves a list of all Lecture entries found in the DB.
    * @return the list of Lecture entries.
@@ -56,6 +62,16 @@ public Lecture add(Lecture entry) throws LectureInvalidTitleException {
       lecture.setTitle(entry.getTitle());
     else
       throw new LectureInvalidTitleException("Method add: Title field can't be invalid.");
+    lecture.setLectureMaterials(entry.getLectureMaterials());
+
+    List<LectureMaterial> lectureMaterialsToSet = new ArrayList<LectureMaterial>();
+    for(LectureMaterial lectureMaterial : entry.getLectureMaterials()) {
+      LectureMaterial lectureToAdd = lectureMaterialRepository.findById(lectureMaterial.getId()).orElse(null);
+      if(lectureToAdd != null)
+        lectureMaterialsToSet.add(lectureToAdd);
+    }
+    if (!lectureMaterialsToSet.isEmpty())
+      lecture.setLectureMaterials(lectureMaterialsToSet);
 
     return lectureRepository.save(lecture);
   }
@@ -75,12 +91,17 @@ public Lecture update(String id, Lecture entry) throws LectureNotFoundException,
     Lecture lectureToUpdate = lectureRepository.findById(id).orElseThrow(
       () -> new LectureNotFoundException("Method update: Lecture not found.")
     );
-    if (entry.getTitle() != null && !entry.getTitle().equals("")) {
+    if (entry.getTitle() != null && !entry.getTitle().equals(""))
       lectureToUpdate.setTitle(entry.getTitle());
-    } else {
-      throw new LectureInvalidTitleException("Method update: Title field can't be invalid.");
-    }
 
+    List<LectureMaterial> lectureMaterialsToSet = new ArrayList<LectureMaterial>();
+    for(LectureMaterial lectureMaterial : entry.getLectureMaterials()) {
+      LectureMaterial lectureToAdd = lectureMaterialRepository.findById(lectureMaterial.getId()).orElse(null);
+      if(lectureToAdd != null)
+        lectureMaterialsToSet.add(lectureToAdd);
+    }
+    if (!lectureMaterialsToSet.isEmpty())
+      lectureToUpdate.setLectureMaterials(lectureMaterialsToSet);
     return lectureRepository.save(lectureToUpdate);
   }