This project demonstrates a simple Spring Boot application containerized with Docker. It serves a "Hello World" message in the "/" route, and a JSON list of items in the "/items" route.

src
├── main
│   ├── java
│   │   └── com
│   │       └── example
│   │           └── demo
│   │               ├── DemoApplication.java
│   │               ├── controller
│   │               │   └── ItemController.java
│   │               ├── service
│   │               │   └── ItemService.java
│   │               ├── dao
│   │               │   └── ItemDao.java
│   │               └── entity
│   │                   └── Item.java
│   └── resources
│       └── application.properties
├── Dockerfile
└── pom.xml

• Java JDK 17 or later
• Maven
• Docker

1. Clone this repository:

   git clone <repository-url>
   cd <project-directory>

2. Build the Spring Boot application:

   mvn clean package

1. Build the Docker image:

   docker build -t springboot-demo .
   

2. Run the Docker container:

   docker run -p 8090:8090 springboot-demo
   

• Hello World message: http://localhost:8090/
• List of items: http://localhost:8090/items

• DemoApplication.java: The main Spring Boot application class.
• ItemController.java: REST controller that handles HTTP requests.
• ItemService.java: Service layer for business logic.
• ItemDao.java: Data Access Object for retrieving item data.
• Item.java: Entity class representing an item.
• application.properties: Configuration file for Spring Boot.
• Dockerfile: Instructions for building the Docker image.

The application is configured to run on port 8090. This can be changed in the application.properties file:

server.port=8090

Remember to update the Dockerfile and Docker run command if you change the port.

If you encounter any issues, ensure that:

1. The required ports are not in use by other applications.

   Most of the time, port 8080 will be in use by other applications such as PostgreSQL, MySQL, etc.

2. You have the necessary permissions to run Docker commands.
3. Your Java and Maven versions are compatible with the project.