4.0.0 org.springframework.boot spring-boot-starter-parent 2.7.18 com.example springboot-postgres-docker-java8 0.0.1-SNAPSHOT springboot-postgres-docker-java8 Demo project for Spring Boot (Java 8) with PostgreSQL in Docker 1.8 springboot-postgres-java8 org.springframework.boot spring-boot-starter-data-jpa org.springframework.boot spring-boot-starter-web org.postgresql postgresql runtime org.springframework.boot spring-boot-starter-test test org.springframework.boot spring-boot-maven-plugin com.spotify dockerfile-maven-plugin 1.4.13 ${docker.image.prefix}/${project.artifactId} ${project.version} target/${project.build.finalName}.jar default install build push # Datasource properties (will be overridden by docker-compose environment variables) spring.datasource.url=jdbc:postgresql://localhost:5432/mydatabase spring.datasource.username=user spring.datasource.password=password # JPA Properties spring.jpa.hibernate.ddl-auto=update # Automatically update schema. Use 'validate' or 'none' in production. spring.jpa.show-sql=true spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect # Server port server.port=8080 package com.example.demo; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class DemoApplication { public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); } } package com.example.demo.model; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.Table; @Entity @Table(name = "items") // Optional: specify table name public class Item { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; private String name; private String description; // Default constructor (required by JPA) public Item() { } // Constructor with fields public Item(String name, String description) { this.name = name; this.description = description; } // Getters and Setters public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getDescription() { return description; } public void setDescription(String description) { this.description = description; } @Override public String toString() { return "Item{" + "id=" + id + ", name='" + name + '\'' + ", description='" + description + '\'' + '}'; } } package com.example.demo.repository; import com.example.demo.model.Item; import org.springframework.data.jpa.repository.JpaRepository; import org.springframework.stereotype.Repository; @Repository public interface ItemRepository extends JpaRepository { // JpaRepository provides CRUD methods like findAll(), findById(), save(), deleteById() // You can add custom query methods here if needed } package com.example.demo.controller; import com.example.demo.model.Item; import com.example.demo.repository.ItemRepository; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.http.HttpStatus; import org.springframework.http.ResponseEntity; import org.springframework.web.bind.annotation.*; import java.util.List; import java.util.Optional; @RestController @RequestMapping("/api/items") // Base path for item-related endpoints public class ItemController { @Autowired private ItemRepository itemRepository; // GET all items @GetMapping public List getAllItems() { return itemRepository.findAll(); } // GET item by ID @GetMapping("/{id}") public ResponseEntity getItemById(@PathVariable Long id) { Optional item = itemRepository.findById(id); return item.map(ResponseEntity::ok) // If found, return 200 OK with item .orElseGet(() -> ResponseEntity.notFound().build()); // If not found, return 404 Not Found } // POST (create) a new item @PostMapping public ResponseEntity createItem(@RequestBody Item item) { try { Item savedItem = itemRepository.save(item); return ResponseEntity.status(HttpStatus.CREATED).body(savedItem); // Return 201 Created with the saved item } catch (Exception e) { // Basic error handling return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build(); } } // PUT (update) an existing item @PutMapping("/{id}") public ResponseEntity updateItem(@PathVariable Long id, @RequestBody Item itemDetails) { Optional optionalItem = itemRepository.findById(id); if (optionalItem.isPresent()) { Item existingItem = optionalItem.get(); existingItem.setName(itemDetails.getName()); existingItem.setDescription(itemDetails.getDescription()); Item updatedItem = itemRepository.save(existingItem); return ResponseEntity.ok(updatedItem); } else { return ResponseEntity.notFound().build(); } } // DELETE an item by ID @DeleteMapping("/{id}") public ResponseEntity deleteItem(@PathVariable Long id) { if (itemRepository.existsById(id)) { itemRepository.deleteById(id); return ResponseEntity.noContent().build(); // Return 204 No Content on successful deletion } else { return ResponseEntity.notFound().build(); } } } # Use an official OpenJDK runtime as a parent image (Java 8 Alpine Linux) FROM openjdk:8-jdk-alpine # Add Maintainer Info LABEL maintainer="CodeJava " # Make port 8080 available to the world outside this container EXPOSE 8080 # Argument to pass the JAR file name ARG JAR_FILE=target/springboot-postgres-docker-java8-0.0.1-SNAPSHOT.jar # Add the application's JAR file to the container COPY ${JAR_FILE} app.jar # Run the JAR file # java -jar /app.jar ENTRYPOINT ["java","-jar","/app.jar"] version: '3.8' services: # PostgreSQL Database Service postgres-db: image: postgres:13-alpine # Using Alpine version for smaller size container_name: postgres_db_container environment: POSTGRES_DB: mydatabase # Database name POSTGRES_USER: user # Database user POSTGRES_PASSWORD: password # Database password ports: - "5432:5432" # Map host port 5432 to container port 5432 volumes: - postgres_data:/var/lib/postgresql/data # Persist database data networks: - springboot-postgres-net # Spring Boot Application Service springboot-app: build: context: . # Build the image from the Dockerfile in the current directory dockerfile: Dockerfile container_name: springboot_app_container depends_on: - postgres-db # Wait for the database service to start first ports: - "8080:8080" # Map host port 8080 to container port 8080 environment: # Override application.properties with Docker service details SPRING_DATASOURCE_URL: jdbc:postgresql://postgres-db:5432/mydatabase # Use service name 'postgres-db' SPRING_DATASOURCE_USERNAME: user SPRING_DATASOURCE_PASSWORD: password SPRING_JPA_HIBERNATE_DDL_AUTO: update # Ensure schema is created/updated on startup networks: - springboot-postgres-net # Define the network networks: springboot-postgres-net: driver: bridge # Define the volume for data persistence volumes: postgres_data: driver: local