Setup

.gitignore

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+.gradle/
+gradle/
+gradlew
+gradlew.bat
+build/
+
+.idea/**/*
+!.idea/.gitignore

.idea/.gitignore

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+!.gitignore
+!.name

.idea/.name

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+Webshop

.run/Postgres.run.xml

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+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Postgres" type="docker-deploy" factoryName="docker-compose.yml" server-name="Docker">
+    <deployment type="docker-compose.yml">
+      <settings>
+        <option name="envFilePath" value="" />
+        <option name="sourceFilePath" value="compose.yml" />
+      </settings>
+    </deployment>
+    <method v="2" />
+  </configuration>
+</component>

.run/WebshopApplication.run.xml

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+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="WebshopApplication" type="SpringBootApplicationConfigurationType" factoryName="Spring Boot" nameIsGenerated="true">
+    <module name="Webshop.main" />
+    <option name="SPRING_BOOT_MAIN_CLASS" value="de.szut.store.WebshopApplication" />
+    <method v="2">
+      <option name="Make" enabled="true" />
+      <option name="RunConfigurationTask" enabled="true" run_configuration_name="Postgres" run_configuration_type="docker-deploy" />
+    </method>
+  </configuration>
+</component>

build.gradle.kts

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+plugins {
+    java
+    id("org.springframework.boot") version "3.3.2"
+    id("io.spring.dependency-management") version "1.1.6"
+}
+
+group = "de.szut"
+version = "0.0.1-SNAPSHOT"
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(22)
+    }
+}
+
+configurations {
+    compileOnly {
+        extendsFrom(configurations.annotationProcessor.get())
+    }
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation("org.springframework.boot:spring-boot-starter-data-jpa")
+    implementation("org.springframework.boot:spring-boot-starter-web")
+    implementation("org.springframework.boot:spring-boot-starter-validation")
+    compileOnly("org.projectlombok:lombok")
+    runtimeOnly("org.postgresql:postgresql")
+    annotationProcessor("org.projectlombok:lombok")
+    testImplementation("org.springframework.boot:spring-boot-starter-test")
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+}
+
+tasks.withType<Test> {
+    useJUnitPlatform()
+}

compose.yml

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+services:
+  postgres:
+    container_name: store_postgres
+    image: postgres:16
+    environment:
+      - POSTGRES_DB=store
+      - POSTGRES_USER=store
+      - POSTGRES_PASSWORD=store123
+    ports:
+      - "5432:5432"
+    volumes:
+      - "store_data:/var/lib/postgresql/data"
+
+volumes:
+  store_data:
+    name: store_data

settings.gradle.kts

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+rootProject.name = "Webshop"

src/main/java/de/szut/store/WebshopApplication.java

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+package de.szut.store;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class WebshopApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(WebshopApplication.class, args);
+    }
+
+}

src/main/java/de/szut/store/article/Article.java

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+package de.szut.store.article;
+
+import de.szut.store.supplier.Supplier;
+import jakarta.persistence.*;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+import java.time.LocalDateTime;
+
+@Getter
+@Setter
+@NoArgsConstructor
+@Entity
+@Table(name="article")
+public class Article {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @NotBlank
+    private String destination;
+
+    @NotBlank
+    private Double price;
+
+    @NotNull
+    private LocalDateTime createDate;
+
+    @NotNull
+    private LocalDateTime lastChangeDate;
+
+    @ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
+    private Supplier supplier;
+}

src/main/java/de/szut/store/article/ArticleRepository.java

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+package de.szut.store.article;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface ArticleRepository extends JpaRepository<Article, Long> {
+}

src/main/java/de/szut/store/contact/Contact.java

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+package de.szut.store.contact;
+
+import de.szut.store.supplier.Supplier;
+import jakarta.persistence.*;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+import lombok.Data;
+
+@Data
+@Entity
+@Table(name="contact")
+public class Contact {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @NotBlank
+    private String street;
+
+    @NotBlank
+    @Size(min = 3, max = 7)
+    private String zipcode;
+
+    @NotBlank
+    private String city;
+
+    @OneToOne(mappedBy = "contact", cascade = CascadeType.ALL)
+    private Supplier supplier;
+
+    private String phone;
+}

src/main/java/de/szut/store/supplier/Supplier.java

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+package de.szut.store.supplier;
+
+import de.szut.store.article.Article;
+import de.szut.store.contact.Contact;
+import jakarta.persistence.*;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+import lombok.Data;
+
+import java.util.Set;
+
+@Data
+@Entity
+@Table(name="supplier")
+public class Supplier {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @NotBlank
+    @Size(min = 3, max = 50)
+    private String name;
+
+    @OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
+    private Contact contact;
+
+    @OneToMany(mappedBy = "supplier", fetch = FetchType.EAGER, cascade = CascadeType.ALL)
+    private Set<Article> articles;
+}

src/main/java/de/szut/store/supplier/SupplierController.java

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+package de.szut.store.supplier;
+
+public class SupplierController {
+}

src/main/java/de/szut/store/supplier/SupplierRepository.java

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+package de.szut.store.supplier;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface SupplierRepository extends JpaRepository<Supplier, Long> {
+}

src/main/java/de/szut/store/supplier/SupplierService.java

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+package de.szut.store.supplier;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class SupplierService {
+    @Autowired
+    private final SupplierRepository repository;
+
+    public SupplierService(SupplierRepository repository) {
+        this.repository = repository;
+    }
+
+    public Supplier create(Supplier newSupplier) {
+        return repository.save(newSupplier);
+    }
+
+    public Supplier update(Supplier newSupplier) {
+        return repository.findById(newSupplier.getId())
+                .map(supplier -> {
+                    supplier.setName(newSupplier.getName());
+                    supplier.getContact().setCity(newSupplier.getContact().getCity());
+                    supplier.getContact().setZipcode(newSupplier.getContact().getZipcode());
+                    supplier.getContact().setStreet(newSupplier.getContact().getStreet());
+                    supplier.getContact().setPhone(newSupplier.getContact().getPhone());
+                    supplier.setArticles(newSupplier.getArticles());
+                    return repository.save(supplier);
+                }).orElse(null);
+    }
+
+    public List<Supplier> readAll() {
+        return repository.findAll();
+    }
+
+    public Supplier readById(Long id) {
+        return repository.findById(id).orElse(null);
+    }
+
+    public void delete(Long id) {
+        repository.deleteById(id);
+    }
+}

src/main/resources/application.properties

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+# General
+spring.application.name=Webshop
+server.port=8080
+
+# DB
+spring.datasource.url=jdbc:postgresql://localhost:5432/store
+spring.datasource.username=store
+spring.datasource.password=store123
+spring.jpa.hibernate.ddl-auto=create-drop

src/test/java/de/szut/webshop/WebshopApplicationTests.java

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+package de.szut.webshop;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class WebshopApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}