Spring Boot - Kotlin

 1package com.demo.project03
 2
 3import com.demo.project03.domain.Customer
 4import com.demo.project03.repo.CustomerRepository
 5import org.slf4j.Logger
 6import org.slf4j.LoggerFactory
 7import org.springframework.boot.CommandLineRunner
 8import org.springframework.boot.autoconfigure.SpringBootApplication
 9import org.springframework.boot.runApplication
10import org.springframework.context.annotation.Bean
11
12@SpringBootApplication
13class Main {
14    private val log: Logger = LoggerFactory.getLogger(this::class.java)
15
16    @Bean
17    fun onStart(repo: CustomerRepository) = CommandLineRunner {
18        log.info("Seeding!")
19        val customer = Customer(0, "Jack", 35)
20        repo.save(customer)
21    }
22}
23
24fun main(args: Array<String>) {
25    runApplication<Main>(*args)
26}

 1package com.demo.project03.controller
 2
 3import com.demo.project03.domain.Customer
 4import com.demo.project03.repo.CustomerRepository
 5import org.slf4j.Logger
 6import org.slf4j.LoggerFactory
 7import org.springframework.beans.factory.annotation.Autowired
 8import org.springframework.web.bind.annotation.GetMapping
 9import org.springframework.web.bind.annotation.PostMapping
10import org.springframework.web.bind.annotation.RequestBody
11import org.springframework.web.bind.annotation.RestController
12
13@RestController
14class HomeController {
15
16    private val log: Logger = LoggerFactory.getLogger(this::class.java)
17
18    @Autowired
19    lateinit var repo: CustomerRepository
20
21    @GetMapping("/customer")
22    fun getCustomer(): MutableIterable<Customer> {
23        log.info("Getting customers!")
24        return repo.findAll()
25    }
26
27    @PostMapping("/customer")
28    fun save(@RequestBody customer: Customer): Customer {
29        return repo.save(customer)
30    }
31}

 1package com.demo.project03.domain
 2
 3import jakarta.persistence.*
 4import java.time.LocalDateTime
 5
 6@Entity
 7@Table(name = "customer")
 8data class Customer(
 9        @Id
10        @GeneratedValue(strategy = GenerationType.IDENTITY)
11        val id: Long = 0,
12        val name: String,
13        val age: Int,
14        val createdAt: LocalDateTime = LocalDateTime.now(),
15)

1package com.demo.project03.repo
2
3import com.demo.project03.domain.Customer
4import org.springframework.data.jpa.repository.JpaRepository
5import org.springframework.stereotype.Repository
6
7@Repository
8interface CustomerRepository : JpaRepository<Customer, Long>

 1# Project03
 2
 3Kotlin Spring Boot Rest
 4
 5[https://github.com/gitorko/project03](https://github.com/gitorko/project03)
 6
 7### Version
 8
 9Check version
10
11```bash
12$java --version
13openjdk version "21.0.3" 2024-04-16 LTS
14```
15
16### Postgres DB
17
18```
19docker run -p 5432:5432 --name pg-container -e POSTGRES_PASSWORD=password -d postgres:14
20docker ps
21docker exec -it pg-container psql -U postgres -W postgres
22CREATE USER test WITH PASSWORD 'test@123';
23CREATE DATABASE "test-db" WITH OWNER "test" ENCODING UTF8 TEMPLATE template0;
24grant all PRIVILEGES ON DATABASE "test-db" to test;
25
26docker stop pg-container
27docker start pg-container
28```
29
30### Dev
31
32To run the backend in dev mode.
33
34```bash
35./gradlew clean build
36./gradlew bootRun
37```
38
39### Prod
40
41To run as a single jar, both UI and backend are bundled to single uber jar.
42
43```bash
44./gradlew bootJar
45java -jar build/libs/project03-1.0.0.jar
46```