docs: More comments

src/main/java/com/maradona/backend/entities/Employee.java

@@ -8,100 +8,230 @@ import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
 
+/**
+ * Represents an employee.
+ * 
+ * An employee is a person who works for the company. Each employee has a unique
+ * employee number, a first name, a last name, a form of address, a start time,
+ * an end time, a list of secondary skills, and a list of projects.
+ */
 @Entity
 @Data
 public class Employee {
+    /**
+     * The unique identifier of the employee.
+     * 
+     * This is the primary key of the employee entity.
+     */
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long eid;
 
+    /**
+     * The employee number of the employee.
+     * 
+     * This is a number from the Inter system.
+     */
     private Integer employeeNr;
 
+    /**
+     * The first name of the employee.
+     */
     @Column(length = 100)
     private String firstName;
 
+    /**
+     * The last name of the employee.
+     */
     @Column(length = 100)
     private String lastName;
 
+    /**
+     * The form of address of the employee.
+     * 
+     * This is a reference to the form of address entity.
+     */
     @ManyToOne
     @JoinColumn(name = "form_of_address_fid")
     private FormOfAddress formOfAddress;
 
+    /**
+     * The start time of the employee's daylie business.
+     */
     private LocalTime dStart;
+
+    /**
+     * The end time of the employee's daylie business.
+     */
     private LocalTime dEnd;
 
+    /**
+     * The secondary skills of the employee.
+     * 
+     * This is a list of secondary skill entities.
+     */
     @OneToMany(mappedBy = "employee", cascade = CascadeType.ALL, orphanRemoval = true)
     @JsonManagedReference
     private List<EmployeeSecondarySkill> secondarySkills;
 
+    /**
+     * The projects of the employee.
+     * 
+     * This is a list of project entities.
+     */
     @ManyToMany
     @JoinTable(name = "employee_project", joinColumns = @JoinColumn(name = "employee_eid"), inverseJoinColumns = @JoinColumn(name = "project_pid"))
     private List<Project> projects;
 
+    /**
+     * Sets the unique identifier of the employee.
+     * 
+     * @param eid The unique identifier of the employee.
+     */
     public void setEid(Long eid) {
         this.eid = eid;
     }
 
+    /**
+     * Returns the unique identifier of the employee.
+     * 
+     * @return The unique identifier of the employee.
+     */
     public Long getEid() {
         return eid;
     }
 
+    /**
+     * Sets the employee number of the employee.
+     * 
+     * @param employeeNr The employee number of the employee.
+     */
     public void setEmployeeNr(Integer employeeNr) {
         this.employeeNr = employeeNr;
     }
 
+    /**
+     * Returns the employee number of the employee.
+     * 
+     * @return The employee number of the employee.
+     */
     public Integer getEmployeeNr() {
         return employeeNr;
     }
 
+    /**
+     * Sets the first name of the employee.
+     * 
+     * @param firstName The first name of the employee.
+     */
     public void setFirstName(String firstName) {
         this.firstName = firstName;
     }
 
+    /**
+     * Returns the first name of the employee.
+     * 
+     * @return The first name of the employee.
+     */
     public String getFirstName() {
         return firstName;
     }
 
+    /**
+     * Sets the last name of the employee.
+     * 
+     * @param lastName The last name of the employee.
+     */
     public void setLastName(String lastName) {
         this.lastName = lastName;
     }
 
+    /**
+     * Returns the last name of the employee.
+     * 
+     * @return The last name of the employee.
+     */
     public String getLastName() {
         return lastName;
     }
 
+    /**
+     * Sets the form of address of the employee.
+     * 
+     * @param formOfAddress The form of address of the employee.
+     */
     public void setFormOfAddress(FormOfAddress formOfAddress) {
         this.formOfAddress = formOfAddress;
     }
 
+    /**
+     * Returns the form of address of the employee.
+     * 
+     * @return The form of address of the employee.
+     */
     public FormOfAddress getFormOfAddress() {
         return formOfAddress;
     }
 
+    /**
+     * Sets the start time of the employee's daylie business.
+     * 
+     * @param dStart The start time of the employee's daylie business.
+     */
     public void setDStart(LocalTime dStart) {
         this.dStart = dStart;
     }
 
+    /**
+     * Returns the start time of the employee's daylie business.
+     * 
+     * @return The start time of the employee's daylie business.
+     */
     public LocalTime getDStart() {
         return dStart;
     }
 
+    /**
+     * Sets the end time of the employee's daylie business.
+     * 
+     * @param dEnd The end time of the employee's daylie business.
+     */
     public void setDEnd(LocalTime dEnd) {
         this.dEnd = dEnd;
     }
 
+    /**
+     * Returns the end time of the employee's daylie business.
+     * 
+     * @return The end time of the employee's daylie business.
+     */
     public LocalTime getDEnd() {
         return dEnd;
     }
 
+    /**
+     * Sets the secondary skills of the employee.
+     * 
+     * @param secondarySkills The secondary skills of the employee.
+     */
     public void setSecondarySkills(List<EmployeeSecondarySkill> secondarySkills) {
         this.secondarySkills = secondarySkills;
     }
 
+    /**
+     * Returns the secondary skills of the employee.
+     * 
+     * @return The secondary skills of the employee.
+     */
     public List<EmployeeSecondarySkill> getSecondarySkills() {
         return secondarySkills;
     }
 
+    /**
+     * Sets the projects of the employee.
+     * 
+     * @param projects The projects of the employee.
+     */
     public Map<SecondarySkill, Integer> getSecondarySkillLevels() {
         return secondarySkills.stream()
                 .collect(Collectors.toMap(EmployeeSecondarySkill::getSecondarySkill, EmployeeSecondarySkill::getLevel));

src/main/java/com/maradona/backend/entities/EmployeeSecondarySkill.java

@@ -4,53 +4,120 @@ import jakarta.persistence.*;
 import lombok.Data;
 import com.fasterxml.jackson.annotation.JsonBackReference;
 
+/**
+ * Represents an employee's secondary skill.
+ * 
+ * An employee's secondary skill is a specific skill that the employee has in
+ * comparison to the primary skills, which is just the category of the skill.
+ */
 @Entity
 @Data
 public class EmployeeSecondarySkill {
+  /**
+   * The unique identifier of the employee's secondary skill.
+   * 
+   * This is the primary key of the employee's secondary skill entity.
+   */
   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   private Long essid;
 
+  /**
+   * The employee that has the secondary skill.
+   * 
+   * This is a reference to the employee entity.
+   */
   @ManyToOne
   @JoinColumn(name = "employee_eid", nullable = false)
   @JsonBackReference
   private Employee employee;
 
+  /**
+   * The secondary skill that the employee has.
+   * 
+   * This is a reference to the secondary skill entity.
+   */
   @ManyToOne
   @JoinColumn(name = "secondary_skill_id", nullable = false)
   private SecondarySkill secondarySkill;
 
+  /**
+   * The level of the secondary skill that the employee has.
+   * 
+   * This is a number from 1 to 5, where 1 is the lowest and 5 is the highest
+   * level.
+   */
   @Column(nullable = false)
   private Integer level;
 
+  /**
+   * Sets the unique identifier of the employee's secondary skill.
+   * 
+   * @param essid The unique identifier of the employee's secondary skill.
+   */
   public void setEssid(Long essid) {
     this.essid = essid;
   }
 
+  /**
+   * Returns the unique identifier of the employee's secondary skill.
+   * 
+   * @return The unique identifier of the employee's secondary skill.
+   */
   public Long getEssid() {
     return essid;
   }
 
+  /**
+   * Sets the employee that has the secondary skill.
+   * 
+   * @param employee The employee that has the secondary skill.
+   */
   public void setEmployee(Employee employee) {
     this.employee = employee;
   }
 
+  /**
+   * Returns the employee that has the secondary skill.
+   * 
+   * @return The employee that has the secondary skill.
+   */
   public Employee getEmployee() {
     return employee;
   }
 
+  /**
+   * Sets the secondary skill that the employee has.
+   * 
+   * @param secondarySkill The secondary skill that the employee has.
+   */
   public void setSecondarySkill(SecondarySkill secondarySkill) {
     this.secondarySkill = secondarySkill;
   }
 
+  /**
+   * Returns the secondary skill that the employee has.
+   * 
+   * @return The secondary skill that the employee has.
+   */
   public SecondarySkill getSecondarySkill() {
     return secondarySkill;
   }
 
+  /**
+   * Sets the level of the secondary skill that the employee has.
+   * 
+   * @param level The level of the secondary skill that the employee has.
+   */
   public void setLevel(Integer level) {
     this.level = level;
   }
 
+  /**
+   * Returns the level of the secondary skill that the employee has.
+   * 
+   * @return The level of the secondary skill that the employee has.
+   */
   public Integer getLevel() {
     return level;
   }

src/main/java/com/maradona/backend/entities/FormOfAddress.java

@@ -5,40 +5,91 @@ import java.util.List;
 import jakarta.persistence.*;
 import lombok.Data;
 
+/**
+ * Represents a form of address.
+ * 
+ * A form of address is a specific way to address a person, like "Herr", "Frau",
+ * "Dr.", "Prof.", etc.
+ */
 @Entity
 @Data
 public class FormOfAddress {
-
+    /**
+     * The unique identifier of the form of address.
+     * 
+     * This is the primary key of the form of address entity.
+     */
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long fid;
 
+    /**
+     * The description of the form of address.
+     * 
+     * This is the actual form of address, like "Herr", "Frau", "Dr.", "Prof.",
+     * etc.
+     */
     @Column(nullable = false, length = 50)
     private String description;
 
+    /**
+     * The employees that have this form of address.
+     * 
+     * This is a list of references to the employee entity.
+     */
     @OneToMany(mappedBy = "formOfAddress")
     private List<Employee> employees;
 
+    /**
+     * Sets the unique identifier of the form of address.
+     * 
+     * @param fid The unique identifier of the form of address.
+     */
     public void setFid(Long fid) {
         this.fid = fid;
     }
 
+    /**
+     * Gets the unique identifier of the form of address.
+     * 
+     * @return The unique identifier of the form of address.
+     */
     public Long getFid() {
         return fid;
     }
 
+    /**
+     * Sets the description of the form of address.
+     * 
+     * @param description The description of the form of address.
+     */
     public void setDescription(String description) {
         this.description = description;
     }
 
+    /**
+     * Gets the description of the form of address.
+     * 
+     * @return The description of the form of address.
+     */
     public String getDescription() {
         return description;
     }
 
+    /**
+     * Sets the employees that have this form of address.
+     * 
+     * @param employees The employees that have this form of address.
+     */
     public void setEmployees(List<Employee> employees) {
         this.employees = employees;
     }
 
+    /**
+     * Gets the employees that have this form of address.
+     * 
+     * @return The employees that have this form of address.
+     */
     public List<Employee> getEmployees() {
         return employees;
     }

src/main/java/com/maradona/backend/entities/PrimarySkill.java

@@ -5,40 +5,92 @@ import com.fasterxml.jackson.annotation.JsonManagedReference;
 import lombok.Data;
 import java.util.List;
 
+/**
+ * Represents a primary skill.
+ * 
+ * A primary skill is a category of skills, like "Programming", "Design",
+ * "Testing",
+ * etc. Each primary skill has a description and a list of secondary skills.
+ */
 @Entity
 @Data
 public class PrimarySkill {
+    /**
+     * The unique identifier of the primary skill.
+     * 
+     * This is the primary key of the primary skill entity.
+     */
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long psid;
 
+    /**
+     * The description of the primary skill.
+     * 
+     * This is the name of the primary skill, like "Programming", "Design",
+     */
     @Column(nullable = false, length = 255)
     private String description;
 
+    /**
+     * The secondary skills that belong to the primary skill.
+     * 
+     * This is a list of references to the secondary skill entity.
+     */
     @OneToMany(mappedBy = "primarySkill", cascade = CascadeType.ALL, orphanRemoval = true)
     @JsonManagedReference
     private List<SecondarySkill> secondarySkills;
 
+    /**
+     * Sets the unique identifier of the primary skill.
+     * 
+     * @param psid The unique identifier of the primary skill.
+     */
     public void setPsid(Long psid) {
         this.psid = psid;
     }
 
+    /**
+     * Gets the unique identifier of the primary skill.
+     * 
+     * @return The unique identifier of the primary skill.
+     */
     public Long getPsid() {
         return psid;
     }
 
+    /**
+     * Sets the description of the primary skill.
+     * 
+     * @param description The description of the primary skill.
+     */
     public void setDescription(String description) {
         this.description = description;
     }
 
+    /**
+     * Gets the description of the primary skill.
+     * 
+     * @return The description of the primary skill.
+     */
     public String getDescription() {
         return description;
     }
 
+    /**
+     * Sets the secondary skills that belong to the primary skill.
+     * 
+     * @param secondarySkills The secondary skills that belong to the primary skill.
+     */
     public void setSecondarySkills(List<SecondarySkill> secondarySkills) {
         this.secondarySkills = secondarySkills;
     }
 
+    /**
+     * Gets the secondary skills that belong to the primary skill.
+     * 
+     * @return The secondary skills that belong to the primary skill.
+     */
     public List<SecondarySkill> getSecondarySkills() {
         return secondarySkills;
     }

src/main/java/com/maradona/backend/entities/Project.java

@@ -5,80 +5,184 @@ import lombok.Data;
 import java.time.LocalDate;
 import java.util.List;
 
+/**
+ * Represents a project.
+ * 
+ * A project is a task that has to be done by a group of employees. Each project
+ * has a unique project number, a name, a start date, an end date, a workload, a
+ * description, and a list of employees.
+ */
 @Entity
 @Data
 public class Project {
-
+    /**
+     * The unique identifier of the project.
+     * 
+     * This is the primary key of the project entity.
+     */
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long pid;
 
+    /**
+     * The name of the project.
+     */
     @Column(nullable = false, length = 255)
     private String name;
 
+    /**
+     * The employees that work on the project.
+     * 
+     * This is a list of references to the employee entity.
+     */
     @ManyToMany(mappedBy = "projects")
     private List<Employee> employees;
 
+    /**
+     * The start date of the project.
+     */
     private LocalDate startDate;
+
+    /**
+     * The end date of the project.
+     */
     private LocalDate endDate;
 
+    /**
+     * The workload of the project.
+     * 
+     * This is the number of hours that have to be worked on the project.
+     */
     private Integer workload;
 
+    /**
+     * The description of the project.
+     */
     @Column(columnDefinition = "TEXT")
     private String description;
 
+    /**
+     * Sets the unique identifier of the project.
+     * 
+     * @param pid The unique identifier of the project.
+     */
     public void setPid(Long pid) {
         this.pid = pid;
     }
 
+    /**
+     * Gets the unique identifier of the project.
+     * 
+     * @return The unique identifier of the project.
+     */
     public Long getPid() {
         return pid;
     }
 
+    /**
+     * Sets the name of the project.
+     * 
+     * @param name The name of the project.
+     */
     public void setName(String name) {
         this.name = name;
     }
 
+    /**
+     * Gets the name of the project.
+     * 
+     * @return The name of the project.
+     */
     public String getName() {
         return name;
     }
 
+    /**
+     * Sets the employees that work on the project.
+     * 
+     * @param employees The employees that work on the project.
+     */
     public void setEmployees(List<Employee> employees) {
         this.employees = employees;
     }
 
+    /**
+     * Gets the employees that work on the project.
+     * 
+     * @return The employees that work on the project.
+     */
     public Iterable<Employee> getEmployees() {
         return employees;
     }
 
+    /**
+     * Sets the start date of the project.
+     * 
+     * @param startDate The start date of the project.
+     */
     public void setStartDate(LocalDate startDate) {
         this.startDate = startDate;
     }
 
+    /**
+     * Gets the start date of the project.
+     * 
+     * @return The start date of the project.
+     */
     public LocalDate getStartDate() {
         return startDate;
     }
 
+    /**
+     * Sets the end date of the project.
+     * 
+     * @param endDate The end date of the project.
+     */
     public void setEndDate(LocalDate endDate) {
         this.endDate = endDate;
     }
 
+    /**
+     * Gets the end date of the project.
+     * 
+     * @return The end date of the project.
+     */
     public LocalDate getEndDate() {
         return endDate;
     }
 
+    /**
+     * Sets the workload of the project.
+     * 
+     * @param workload The workload of the project.
+     */
     public void setWorkload(Integer workload) {
         this.workload = workload;
     }
 
+    /**
+     * Gets the workload of the project.
+     * 
+     * @return The workload of the project.
+     */
     public Integer getWorkload() {
         return workload;
     }
 
+    /**
+     * Sets the description of the project.
+     * 
+     * @param description The description of the project.
+     */
     public void setDescription(String description) {
         this.description = description;
     }
 
+    /**
+     * Gets the description of the project.
+     * 
+     * @return The description of the project.
+     */
     public String getDescription() {
         return description;
     }

src/main/java/com/maradona/backend/entities/SecondarySkill.java

@@ -6,53 +6,120 @@ import com.fasterxml.jackson.annotation.JsonManagedReference;
 import lombok.Data;
 import java.util.List;
 
+/**
+ * Represents a secondary skill.
+ * 
+ * A secondary skill is a specific skill that an employee has in comparison to
+ * the primary skills, which is just the category of the skill.
+ */
 @Entity
 @Data
 public class SecondarySkill {
+    /**
+     * The unique identifier of the secondary skill.
+     * 
+     * This is the primary key of the secondary skill entity.
+     */
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long ssid;
 
+    /**
+     * The description of the secondary skill.
+     * 
+     * This is the name of the secondary skill, like "Java", "C++", "Python",
+     * etc.
+     */
     @Column(nullable = false, length = 255)
     private String description;
 
+    /**
+     * The primary skill that the secondary skill belongs to.
+     * 
+     * This is a reference to the primary skill entity.
+     */
     @ManyToOne
     @JoinColumn(name = "psid", nullable = false)
     @JsonBackReference
     private PrimarySkill primarySkill;
 
+    /**
+     * The employees that have the secondary skill.
+     * 
+     * This is a list of references to the employee's secondary skill entity.
+     */
     @OneToMany(mappedBy = "secondarySkill", cascade = CascadeType.ALL, orphanRemoval = true)
     @JsonManagedReference
     private List<EmployeeSecondarySkill> employeeSecondarySkills;
 
+    /**
+     * Sets the unique identifier of the secondary skill.
+     * 
+     * @param ssid The unique identifier of the secondary skill.
+     */
     public void setSsid(Long ssid) {
         this.ssid = ssid;
     }
 
+    /**
+     * Gets the unique identifier of the secondary skill.
+     * 
+     * @return The unique identifier of the secondary skill.
+     */
     public Long getSsid() {
         return ssid;
     }
 
+    /**
+     * Sets the description of the secondary skill.
+     * 
+     * @param description The description of the secondary skill.
+     */
     public void setDescription(String description) {
         this.description = description;
     }
 
+    /**
+     * Gets the description of the secondary skill.
+     * 
+     * @return The description of the secondary skill.
+     */
     public String getDescription() {
         return description;
     }
 
+    /**
+     * Sets the primary skill that the secondary skill belongs to.
+     * 
+     * @param primarySkill The primary skill that the secondary skill belongs to.
+     */
     public void setPrimarySkill(PrimarySkill primarySkill) {
         this.primarySkill = primarySkill;
     }
 
+    /**
+     * Gets the primary skill that the secondary skill belongs to.
+     * 
+     * @return The primary skill that the secondary skill belongs to.
+     */
     public PrimarySkill getPrimarySkill() {
         return primarySkill;
     }
 
+    /**
+     * Sets the employees that have the secondary skill.
+     * 
+     * @param employeeSecondarySkills The employees that have the secondary skill.
+     */
     public void setEmployeeSecondarySkills(List<EmployeeSecondarySkill> employeeSecondarySkills) {
         this.employeeSecondarySkills = employeeSecondarySkills;
     }
 
+    /**
+     * Gets the employees that have the secondary skill.
+     * 
+     * @return The employees that have the secondary skill.
+     */
     public List<EmployeeSecondarySkill> getEmployeeSecondarySkills() {
         return employeeSecondarySkills;
     }

src/main/java/com/maradona/backend/repositories/EmployeeRepository.java

@@ -3,5 +3,11 @@ package com.maradona.backend.repositories;
 import org.springframework.data.repository.CrudRepository;
 import com.maradona.backend.entities.Employee;
 
+/**
+ * EmployeeRepository
+ * 
+ * This interface is a repository for the Employee entity.
+ * It automatically generates the CRUD operations for the Employee entity.
+ */
 public interface EmployeeRepository extends CrudRepository<Employee, Long> {
 }

src/main/java/com/maradona/backend/repositories/EmployeeSecondarySkillRepository.java

@@ -3,5 +3,12 @@ package com.maradona.backend.repositories;
 import org.springframework.data.repository.CrudRepository;
 import com.maradona.backend.entities.EmployeeSecondarySkill;
 
+/**
+ * EmployeeSecondarySkillRepository
+ * 
+ * This interface is a repository for the EmployeeSecondarySkill entity.
+ * It automatically generates the CRUD operations for the EmployeeSecondarySkill
+ * entity.
+ */
 public interface EmployeeSecondarySkillRepository extends CrudRepository<EmployeeSecondarySkill, Long> {
 }

src/main/java/com/maradona/backend/repositories/FormOfAddressRepository.java

@@ -3,5 +3,11 @@ package com.maradona.backend.repositories;
 import org.springframework.data.repository.CrudRepository;
 import com.maradona.backend.entities.FormOfAddress;
 
+/**
+ * FormOfAddressRepository
+ * 
+ * This interface is a repository for the FormOfAddress entity.
+ * It automatically generates the CRUD operations for the FormOfAddress entity.
+ */
 public interface FormOfAddressRepository extends CrudRepository<FormOfAddress, Long> {
 }

src/main/java/com/maradona/backend/repositories/PrimarySkillRepository.java

@@ -3,5 +3,11 @@ package com.maradona.backend.repositories;
 import org.springframework.data.repository.CrudRepository;
 import com.maradona.backend.entities.PrimarySkill;
 
+/**
+ * PrimarySkillRepository
+ * 
+ * This interface is a repository for the PrimarySkill entity.
+ * It automatically generates the CRUD operations for the PrimarySkill entity.
+ */
 public interface PrimarySkillRepository extends CrudRepository<PrimarySkill, Long> {
 }

src/main/java/com/maradona/backend/repositories/ProjectRepository.java

@@ -3,5 +3,11 @@ package com.maradona.backend.repositories;
 import org.springframework.data.repository.CrudRepository;
 import com.maradona.backend.entities.Project;
 
+/**
+ * ProjectRepository
+ * 
+ * This interface is a repository for the Project entity.
+ * It automatically generates the CRUD operations for the Project entity.
+ */
 public interface ProjectRepository extends CrudRepository<Project, Long> {
 }

src/main/java/com/maradona/backend/repositories/SecondarySkillRepository.java

@@ -3,5 +3,11 @@ package com.maradona.backend.repositories;
 import org.springframework.data.repository.CrudRepository;
 import com.maradona.backend.entities.SecondarySkill;
 
+/**
+ * SecondarySkillRepository
+ * 
+ * This interface is a repository for the SecondarySkill entity.
+ * It automatically generates the CRUD operations for the SecondarySkill entity.
+ */
 public interface SecondarySkillRepository extends CrudRepository<SecondarySkill, Long> {
 }

src/main/java/com/maradona/backend/services/actions/EmployeeActions.java

@@ -9,21 +9,46 @@ import com.maradona.backend.services.details.EmployeeDetails;
 import com.maradona.backend.services.details.SecondarySkillDetails;
 import com.maradona.backend.dto.SkillPrototype;
 
+/**
+ * EmployeeActions
+ * 
+ * This class contains the business logic for the Employee entity.
+ */
 @Service
 public class EmployeeActions {
+
+  /**
+   * The EmployeeRepository instance.
+   */
   @Autowired
   private EmployeeRepository employeeRepository;
 
+  /**
+   * The EmployeeDetails instance.
+   */
   @Autowired
   private EmployeeDetails employeeDetails;
 
+  /**
+   * The SecondarySkillDetails instance.
+   */
   @Autowired
   private SecondarySkillDetails secondarySkillDetails;
 
-  public Employee saveEmployee(Employee employee) {
-    return employeeRepository.save(employee);
+  /**
+   * This method saves an Employee entity.
+   * 
+   * @param employee The Employee entity to save.
+   */
+  public void saveEmployee(Employee employee) {
+    employeeRepository.save(employee);
   }
 
+  /**
+   * This method deletes an Employee entity.
+   * 
+   * @param eid The Employee ID.
+   */
   public void deleteEmployee(Long eid) {
     for (Employee employee : employeeRepository.findAll()) {
       if (employee.getEid().equals(eid)) {
@@ -33,6 +58,12 @@ public class EmployeeActions {
     }
   }
 
+  /**
+   * This method adds a secondary skill to an Employee entity.
+   * 
+   * @param eid            The Employee ID.
+   * @param skillPrototype The SkillPrototype instance.
+   */
   public void addSecondarySkillToEmployee(Long eid, SkillPrototype skillPrototype) {
     var employee = employeeDetails.getEmployeeByEid(eid).orElseThrow(() -> new RuntimeException("Employee not found"));
     var secondarySkill = secondarySkillDetails.getSecondarySkillBySsid(skillPrototype.getSsid())
@@ -52,6 +83,13 @@ public class EmployeeActions {
     saveEmployee(employee);
   }
 
+  /**
+   * This method updates the level of a secondary skill of an Employee entity.
+   * 
+   * @param eid   The Employee ID.
+   * @param ssid  The Secondary Skill ID.
+   * @param level The new level.
+   */
   public void updateSecondarySkillLevel(Long eid, Long ssid, Integer level) {
     var employee = employeeDetails.getEmployeeByEid(eid).orElseThrow(() -> new RuntimeException("Employee not found"));
     secondarySkillDetails.getSecondarySkillBySsid(
@@ -68,6 +106,12 @@ public class EmployeeActions {
     saveEmployee(employee);
   }
 
+  /**
+   * This method deletes a secondary skill from an Employee entity.
+   * 
+   * @param eid  The Employee ID.
+   * @param ssid The Secondary Skill ID.
+   */
   public void deleteSecondarySkillFromEmployee(Long eid, Long ssid) {
     var employee = employeeDetails.getEmployeeByEid(eid).orElseThrow(() -> new RuntimeException("Employee not found"));
     secondarySkillDetails.getSecondarySkillBySsid(

src/main/java/com/maradona/backend/services/actions/FormOfAddressActions.java

@@ -6,19 +6,40 @@ import com.maradona.backend.entities.FormOfAddress;
 import com.maradona.backend.repositories.FormOfAddressRepository;
 import com.maradona.backend.services.details.FormOfAddressDetails;
 
+/**
+ * FormOfAddressActions
+ * 
+ * This class contains the business logic for the FormOfAddress entity.
+ */
 @Service
 public class FormOfAddressActions {
-
+  /**
+   * The FormOfAddressRepository instance.
+   */
   @Autowired
   private FormOfAddressRepository formOfAddressRepository;
 
+  /**
+   * The FormOfAddressDetails instance.
+   */
   @Autowired
   private FormOfAddressDetails formOfAddressDetails;
 
+  /**
+   * This method saves a FormOfAddress entity.
+   * 
+   * @param formOfAddress The FormOfAddress entity to save.
+   * @return The saved FormOfAddress entity.
+   */
   public FormOfAddress saveFormOfAddress(FormOfAddress formOfAddress) {
     return formOfAddressRepository.save(formOfAddress);
   }
 
+  /**
+   * This method deletes a FormOfAddress entity.
+   * 
+   * @param fid The FormOfAddress ID.
+   */
   public void deleteFormOfAddress(Long fid) {
     for (FormOfAddress formOfAddress : formOfAddressRepository.findAll()) {
       if (formOfAddress.getFid().equals(fid)) {
@@ -28,6 +49,12 @@ public class FormOfAddressActions {
     }
   }
 
+  /**
+   * This method updates the description of a FormOfAddress entity.
+   * 
+   * @param fid         The FormOfAddress ID.
+   * @param description The new description.
+   */
   public void updateFormOfAddress(Long fid, String description) {
     var formOfAddress = formOfAddressDetails.getFormOfAddressByFid(fid)
         .orElseThrow(() -> new RuntimeException("Form of Address not found"));

src/main/java/com/maradona/backend/services/actions/PrimarySkillActions.java

@@ -8,22 +8,47 @@ import com.maradona.backend.repositories.PrimarySkillRepository;
 import com.maradona.backend.repositories.SecondarySkillRepository;
 import com.maradona.backend.services.details.SecondarySkillDetails;
 
+/**
+ * PrimarySkillActions
+ * 
+ * This class contains the business logic for the PrimarySkill entity.
+ */
 @Service
 public class PrimarySkillActions {
 
+  /**
+   * The PrimarySkillRepository instance.
+   */
   @Autowired
   private PrimarySkillRepository primarySkillRepository;
 
+  /**
+   * The SecondarySkillDetails instance.
+   */
   @Autowired
   private SecondarySkillDetails secondarySkillDetails;
 
+  /**
+   * The SecondarySkillRepository instance.
+   */
   @Autowired
   private SecondarySkillRepository secondarySkillRepository;
 
+  /**
+   * This method saves a PrimarySkill entity.
+   * 
+   * @param primarySkill The PrimarySkill entity to save.
+   * @return The saved PrimarySkill entity.
+   */
   public PrimarySkill savePrimarySkill(PrimarySkill primarySkill) {
     return primarySkillRepository.save(primarySkill);
   }
 
+  /**
+   * This method deletes a PrimarySkill entity.
+   * 
+   * @param psid The PrimarySkill ID.
+   */
   public void deletePrimarySkill(Long psid) {
     var primarySkills = primarySkillRepository.findAll();
     var secondarySkills = secondarySkillDetails.getAllSecondarySkills();

src/main/java/com/maradona/backend/services/actions/ProjectActions.java

@@ -11,22 +11,47 @@ import com.maradona.backend.repositories.ProjectRepository;
 import com.maradona.backend.services.details.EmployeeDetails;
 import com.maradona.backend.services.details.ProjectDetails;
 
+/**
+ * ProjectActions
+ * 
+ * This class contains the business logic for the Project entity.
+ */
 @Service
 public class ProjectActions {
 
+  /**
+   * The ProjectRepository instance.
+   */
   @Autowired
   private ProjectRepository projectRepository;
 
+  /**
+   * The ProjectDetails instance.
+   */
   @Autowired
   private ProjectDetails projectDetails;
 
+  /**
+   * The EmployeeDetails instance.
+   */
   @Autowired
   private EmployeeDetails employeeDetails;
 
+  /**
+   * This method saves a Project entity.
+   * 
+   * @param project The Project entity to save.
+   * @return The saved Project entity.
+   */
   public Project saveProject(Project project) {
     return projectRepository.save(project);
   }
 
+  /**
+   * This method deletes a Project entity.
+   * 
+   * @param pid The Project ID.
+   */
   public void deleteProject(Long pid) {
     var projects = projectRepository.findAll();
     for (Project project : projects) {
@@ -36,6 +61,12 @@ public class ProjectActions {
     }
   }
 
+  /**
+   * This method adds an Employee to a Project.
+   * 
+   * @param pid The Project ID.
+   * @param eid The Employee ID.
+   */
   public void addEmployeeToProject(Long pid, Long eid) {
     var project = projectDetails.getProjectByPid(pid).orElse(null);
     var newEmployee = employeeDetails.getEmployeeByEid(eid).orElse(null);
@@ -48,6 +79,12 @@ public class ProjectActions {
     project.setEmployees(employeeList);
   }
 
+  /**
+   * This method removes an Employee from a Project.
+   * 
+   * @param pid The Project ID.
+   * @param eid The Employee ID.
+   */
   public void removeEmployeeFromProject(Long pid, Long eid) {
     var project = projectDetails.getProjectByPid(pid).orElse(null);
     var oldEmployees = project.getEmployees();

src/main/java/com/maradona/backend/services/actions/SecondarySkillActions.java

@@ -7,17 +7,37 @@ import com.maradona.backend.repositories.PrimarySkillRepository;
 import com.maradona.backend.repositories.SecondarySkillRepository;
 import com.maradona.backend.services.details.PrimarySkillDetails;
 
+/**
+ * SecondarySkillActions
+ * 
+ * This class contains the business logic for the SecondarySkill entity.
+ */
 @Service
 public class SecondarySkillActions {
+  /**
+   * The SecondarySkillRepository instance.
+   */
   @Autowired
   private SecondarySkillRepository secondarySkillRepository;
 
+  /**
+   * The PrimarySkillDetails instance.
+   */
   @Autowired
   private PrimarySkillDetails primarySkillDetails;
 
+  /**
+   * The PrimarySkillRepository instance.
+   */
   @Autowired
   private PrimarySkillRepository primarySkillrRepository;
 
+  /**
+   * This method saves a SecondarySkill entity.
+   * 
+   * @param secondarySkill The SecondarySkill entity to save.
+   * @return The saved SecondarySkill entity.
+   */
   public SecondarySkill saveSecondarySkill(SecondarySkill secondarySkill) {
     var primarySkillDescription = secondarySkill.getPrimarySkill().getDescription();
     var existingPrimarySkill = primarySkillDetails.findByDescription(primarySkillDescription);
@@ -31,6 +51,11 @@ public class SecondarySkillActions {
     return secondarySkillRepository.save(secondarySkill);
   }
 
+  /**
+   * This method deletes a SecondarySkill entity.
+   * 
+   * @param ssid The SecondarySkill ID.
+   */
   public void deleteSecondarySkill(Long ssid) {
     var secondarySkills = secondarySkillRepository.findAll();
     for (SecondarySkill secondarySkill : secondarySkills) {

src/main/java/com/maradona/backend/services/details/EmployeeDetails.java

@@ -7,11 +7,24 @@ import com.maradona.backend.repositories.EmployeeRepository;
 
 import java.util.Optional;
 
+/**
+ * EmployeeDetails
+ * 
+ * This class contains the business logic for the Employee entity.
+ */
 @Service
 public class EmployeeDetails {
+  /**
+   * The EmployeeRepository instance.
+   */
   @Autowired
   private EmployeeRepository employeeRepository;
 
+  /**
+   * This method saves an Employee entity.
+   * 
+   * @param employee The Employee entity to save.
+   */
   public Optional<Employee> getEmployeeByEid(Long eid) {
     var employees = employeeRepository.findAll();
     for (Employee employee : employees) {
@@ -22,10 +35,21 @@ public class EmployeeDetails {
     return Optional.empty();
   }
 
+  /**
+   * This method returns all Employee entities.
+   * 
+   * @return All Employee entities.
+   */
   public Iterable<Employee> getAllEmployees() {
     return employeeRepository.findAll();
   }
 
+  /**
+   * This method returns all Employee entities with a specific primary skill.
+   * 
+   * @param psid The primary skill ID.
+   * @return All Employee entities with the specified primary skill.
+   */
   public Iterable<Employee> getEmployeesBySecondarySkill(Long ssid, Integer level) {
     // Implement logic to fetch employees by secondary skill and level
     // TODO: This is a placeholder implementation

src/main/java/com/maradona/backend/services/details/FormOfAddressDetails.java

@@ -7,12 +7,24 @@ import com.maradona.backend.repositories.FormOfAddressRepository;
 
 import java.util.Optional;
 
+/**
+ * FormOfAddressDetails
+ * 
+ * This class contains the business logic for the FormOfAddress entity.
+ */
 @Service
 public class FormOfAddressDetails {
-
+  /**
+   * The FormOfAddressRepository instance.
+   */
   @Autowired
   private FormOfAddressRepository formOfAddressRepository;
 
+  /**
+   * This method saves a FormOfAddress entity.
+   * 
+   * @param formOfAddress The FormOfAddress entity to save.
+   */
   public Optional<FormOfAddress> getFormOfAddressByFid(Long fid) {
     var formOfAddresses = formOfAddressRepository.findAll();
     for (FormOfAddress formOfAddress : formOfAddresses) {
@@ -23,6 +35,11 @@ public class FormOfAddressDetails {
     return Optional.empty();
   }
 
+  /**
+   * This method returns all FormOfAddress entities.
+   * 
+   * @return All FormOfAddress entities.
+   */
   public Iterable<FormOfAddress> getAllFormOfAddresses() {
     return formOfAddressRepository.findAll();
   }

src/main/java/com/maradona/backend/services/details/PrimarySkillDetails.java

@@ -7,12 +7,25 @@ import com.maradona.backend.repositories.PrimarySkillRepository;
 
 import java.util.Optional;
 
+/**
+ * PrimarySkillDetails
+ * 
+ * This class contains the business logic for the PrimarySkill entity.
+ */
 @Service
 public class PrimarySkillDetails {
-
+  /**
+   * The PrimarySkillRepository instance.
+   */
   @Autowired
   private PrimarySkillRepository primarySkillRepository;
 
+  /**
+   * This method saves a PrimarySkill entity.
+   * 
+   * @param primarySkill The PrimarySkill entity to save.
+   * @return The saved PrimarySkill entity.
+   */
   public Optional<PrimarySkill> getPrimarySkillByPsid(Long psid) {
     var primarySkills = primarySkillRepository.findAll();
     for (PrimarySkill primarySkill : primarySkills) {
@@ -23,10 +36,20 @@ public class PrimarySkillDetails {
     return Optional.empty();
   }
 
+  /**
+   * This method returns all PrimarySkill entities.
+   * 
+   * @return All PrimarySkill entities.
+   */
   public Iterable<PrimarySkill> getAllPrimarySkills() {
     return primarySkillRepository.findAll();
   }
 
+  /**
+   * This method deletes a PrimarySkill entity.
+   * 
+   * @param psid The PrimarySkill ID.
+   */
   public Optional<PrimarySkill> findByDescription(String description) {
     var allPrimarySkills = primarySkillRepository.findAll();
     for (PrimarySkill primarySkill : allPrimarySkills) {

src/main/java/com/maradona/backend/services/details/ProjectDetails.java

@@ -10,12 +10,26 @@ import com.maradona.backend.repositories.ProjectRepository;
 import java.util.ArrayList;
 import java.util.Optional;
 
+/**
+ * ProjectDetails
+ * 
+ * This class contains the business logic for the Project entity.
+ */
 @Service
 public class ProjectDetails {
 
+  /**
+   * The ProjectRepository instance.
+   */
   @Autowired
   private ProjectRepository projectRepository;
 
+  /**
+   * This method saves a Project entity.
+   * 
+   * @param project The Project entity to save.
+   * @return The saved Project entity.
+   */
   public Optional<Project> getProjectByPid(Long pid) {
     var projects = projectRepository.findAll();
     for (Project project : projects) {
@@ -26,16 +40,33 @@ public class ProjectDetails {
     return Optional.empty();
   }
 
+  /**
+   * This method returns all Project entities.
+   * 
+   * @return All Project entities.
+   */
   public Iterable<Project> getAllProjects() {
     return projectRepository.findAll();
   }
 
+  /**
+   * This method returns all Employee entities for a specific Project.
+   * 
+   * @param pid The Project ID.
+   * @return All Employee entities for the specified Project.
+   */
   public Iterable<Employee> getProjectEmployees(Long pid) {
     var project = getProjectByPid(pid).orElse(null);
     var employees = project.getEmployees();
     return employees;
   }
 
+  /**
+   * This method returns all Project entities for a specific Employee.
+   * 
+   * @param eid The Employee ID.
+   * @return All Project entities for the specified Employee.
+   */
   public Iterable<Project> getProjectsByEid(Long eid) {
     var projects = projectRepository.findAll();
     var employeeProjects = new ArrayList<Project>();

src/main/java/com/maradona/backend/services/details/SecondarySkillDetails.java

@@ -7,11 +7,25 @@ import com.maradona.backend.repositories.SecondarySkillRepository;
 
 import java.util.Optional;
 
+/**
+ * SecondarySkillDetails
+ * 
+ * This class contains the business logic for the SecondarySkill entity.
+ */
 @Service
 public class SecondarySkillDetails {
+  /**
+   * The SecondarySkillRepository instance.
+   */
   @Autowired
   private SecondarySkillRepository secondarySkillRepository;
 
+  /**
+   * This method saves a SecondarySkill entity.
+   * 
+   * @param secondarySkill The SecondarySkill entity to save.
+   * @return The saved SecondarySkill entity.
+   */
   public Optional<SecondarySkill> getSecondarySkillBySsid(Long ssid) {
     var secondarySkills = secondarySkillRepository.findAll();
     for (SecondarySkill secondarySkill : secondarySkills) {
@@ -22,6 +36,11 @@ public class SecondarySkillDetails {
     return Optional.empty();
   }
 
+  /**
+   * This method returns all SecondarySkill entities.
+   * 
+   * @return All SecondarySkill entities.
+   */
   public Iterable<SecondarySkill> getSecondarySkillsByPrimarySkillId(Long psid) {
     var skills = secondarySkillRepository.findAll();
     var result = new java.util.ArrayList<SecondarySkill>();
@@ -33,6 +52,11 @@ public class SecondarySkillDetails {
     return result;
   }
 
+  /**
+   * This method returns all SecondarySkill entities.
+   * 
+   * @return All SecondarySkill entities.
+   */
   public Iterable<SecondarySkill> getAllSecondarySkills() {
     return secondarySkillRepository.findAll();
   }

src/main/java/com/maradona/backend/services/transfer/SkillService.java

@@ -16,18 +16,36 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 
+/**
+ * SkillService
+ * 
+ * This class contains the business logic for the Skill entity.
+ */
 @Service
 public class SkillService {
-
+  /**
+   * The PrimarySkillDetails instance.
+   */
   @Autowired
   private PrimarySkillDetails primarySkillDetails;
 
+  /**
+   * The SecondarySkillDetails instance.
+   */
   @Autowired
   private SecondarySkillDetails secondarySkillDetails;
 
+  /**
+   * The EmployeeDetails instance.
+   */
   @Autowired
   private EmployeeDetails employeeDetails;
 
+  /**
+   * This method returns all Skill entities.
+   * 
+   * @return All Skill entities.
+   */
   public Iterable<SkillList> getAllSkills() {
     Iterable<PrimarySkill> primarySkills = primarySkillDetails.getAllPrimarySkills();
     Iterable<SecondarySkill> secondarySkills = secondarySkillDetails.getAllSecondarySkills();
@@ -45,6 +63,12 @@ public class SkillService {
     return skills;
   }
 
+  /**
+   * This method returns all Skill entities for a given employee.
+   * 
+   * @param eid The employee ID.
+   * @return All Skill entities for the given employee.
+   */
   public Iterable<SkillList> getUserSkills(Long eid) {
     if (eid == null) {
       return new ArrayList<>();