Postgresql – Problem in a function inside of contructor isnt returning the expected value after using Post method

Problem in calculating the age of majority of a student in Spring Boot

I have a Student class with the following attributes:

package com.example.estudantes.model;

import jakarta.persistence.*;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;

import java.time.LocalDate;
import java.time.Period;

@Entity
@Table(name = "students")
@Getter
@Setter
@NoArgsConstructor
public class Student {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id ;
    private String name;
    private LocalDate dateOfBirth;
    private boolean ageMajority;
    private LocalDate dateOfCreation;

    public Student(String name, LocalDate dateOfBirth) {
        this.name = name;
        this.dateOfBirth = dateOfBirth;
        this.ageMajority = this.isOfLegalAge(dateOfBirth);
        this.dateOfCreation = LocalDate.now();
    }

    private boolean isOfLegalAge(LocalDate dateOfBirth) {
        Period period = Period.between( dateOfBirth,LocalDate.now());
        return period.getYears() >= 18 ;
    }

}

here is the Repository ,Service , Controller and Pom :
Repository:

package com.example.estudantes.repository;

import com.example.estudantes.model.Student;
import org.springframework.data.jpa.repository.JpaRepository;

public interface StudentRepository extends JpaRepository<Student,Long> {
}

Service:

import com.example.estudantes.model.Student;
import com.example.estudantes.repository.StudentRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Optional;

@Service
public class StudentService {
    @Autowired
    private StudentRepository studentRepository;
    public List<Student> getAllStudents(){
        return studentRepository.findAll();
    }
    public Object getStudentById(Long id){
        Optional<Student> optionalStudent = studentRepository.findById(id);
        return optionalStudent.isPresent() ? optionalStudent.get() :"Student not found";
    }
    public  Student insertStudent(Student student){
        studentRepository.save(student);
        return student;
    }
    public Object updateStudent(Long id ,Student student){
        Optional<Student> optionalStudent = studentRepository.findById(id);
        if (optionalStudent.isPresent()){
            Student student1 = new Student(student.getName(),student.getDateOfBirth());
            student1.setId(id);
            studentRepository.save(student1);
            return student1;
        }
        return "Student not found";
    }
    public String deleteStudent(Long id){
        Optional<Student> optionalStudent = studentRepository.findById(id);
        if (optionalStudent.isPresent()){
            studentRepository.deleteById(id);
            return "Student deleted successfully";
        }
        return "Student not found";
    }
}

Controller:

package com.example.estudantes.controller;

import com.example.estudantes.model.Student;
import com.example.estudantes.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@RequestMapping("student")
public class StudentController {
    @Autowired
    private StudentService studentService;
    @GetMapping
    public List<Student> getAllStudents(){
        return studentService.getAllStudents();
    }
    @GetMapping("{id}")
    public Object getStudentById(@PathVariable Long id){
        return studentService.getStudentById(id);
    }
    @PostMapping
    public Student inserirEstudante(@RequestBody Student student){
        return  studentService.insertStudent(student);
    }
    @PutMapping("{id}")
    public Object updateStudent(@PathVariable Long id , @RequestBody Student student){
        return studentService.updateStudent(id,student);
    }
    @DeleteMapping("{id}")
    public String deleteStudent(@PathVariable Long id){
        return studentService.deleteStudent(id);
    }
}

POM.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.3.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>estudantes</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>estudantes</name>
    <description>Uma aplicação sobre estudantes</description>
    <url/>
    <licenses>
        <license/>
    </licenses>
    <developers>
        <developer/>
    </developers>
    <scm>
        <connection/>
        <developerConnection/>
        <tag/>
        <url/>
    </scm>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api -->
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>5.11.3</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

I am using the PostgreSQL database. I tried to use several other alternatives that the artificial intelligence showed me, but they did not work.

The problem is that, when passing parameters for the date of birth (1900-11-25) and storing in the database using the POST method in Spring Boot, the isOfLegalAge() function always returns false and dateOfCreation return null, except when I use the PUT method to change.

For example: when I use postman and using POST method pass the following parameters

{
        "name":"F",
        "dateOfBirth":"1900-11-25"

        
    }

it return to me(and is saved in the data base) :

{
    "id": 2,
    "name": "F",
    "dateOfBirth": "1900-11-25",
    "ageMajority": false,
    "dateOfCreation": null
}

But when I use PUT method ( in the url http://localhost:8080/student/2 on postman) passing the same parameters

{
        "name":"F",
        "dateOfBirth":"1900-11-25"

        
    }

It return to me (and is saved in the data base) :

{
    "id": 2,
    "name": "F",
    "dateOfBirth": "1900-11-25",
    "ageMajority": true,
    "dateOfCreation": "2024-11-25"
}

I would like the ageMajority attribute to be saved as true and dateOfCreation be saved when using the POST method. How can I solve this problem?