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spring-boot-template

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Template for Spring Boot applications

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# Spring Boot application template

## Purpose

The purpose of this template is to speed up the creation of new Spring applications within HMCTS
and help keep the same standards across multiple teams. If you need to create a new app, you can
simply use this one as a starting point and build on top of it.

## What's inside

The template is a working application with a minimal setup. It contains:
 * application skeleton
 * setup script to prepare project
 * common plugins and libraries
 * [HMCTS Java plugin](https://github.com/hmcts/gradle-java-plugin)
 * docker setup
 * automatically publishes API documentation to [hmcts/cnp-api-docs](https://github.com/hmcts/cnp-api-docs)
 * code quality tools already set up
 * MIT license and contribution information
 * Helm chart using chart-java.

The application exposes health endpoint (http://localhost:4550/health) and metrics endpoint
(http://localhost:4550/metrics).

## Plugins

The template contains the following plugins:

* HMCTS Java plugin

Applies code analysis tools with HMCTS default settings. See the [project repository](https://github.com/hmcts/gradle-java-plugin) for details.

Analysis tools include:

* checkstyle

https://docs.gradle.org/current/userguide/checkstyle_plugin.html

Performs code style checks on Java source files using Checkstyle and generates reports from these checks.
        The checks are included in gradle's *check* task (you can run them by executing `./gradlew check` command).

* org.owasp.dependencycheck

https://jeremylong.github.io/DependencyCheck/dependency-check-gradle/index.html

Provides monitoring of the project's dependent libraries and creating a report
        of known vulnerable components that are included in the build. To run it
        execute `gradle dependencyCheck` command.

* jacoco

https://docs.gradle.org/current/userguide/jacoco_plugin.html

Provides code coverage metrics for Java code via integration with JaCoCo.
    You can create the report by running the following command:

```bash
      ./gradlew jacocoTestReport
    ```

The report will be created in build/reports subdirectory in your project directory.

* io.spring.dependency-management

https://github.com/spring-gradle-plugins/dependency-management-plugin

Provides Maven-like dependency management. Allows you to declare dependency management
    using `dependency 'groupId:artifactId:version'`
    or `dependency group:'group', name:'name', version:version'`.

* org.springframework.boot

http://projects.spring.io/spring-boot/

Reduces the amount of work needed to create a Spring application

* com.github.ben-manes.versions

https://github.com/ben-manes/gradle-versions-plugin

Provides a task to determine which dependencies have updates. Usage:

```bash
      ./gradlew dependencyUpdates -Drevision=release
    ```

## Setup

Located in `./bin/init.sh`. Simply run and follow the explanation how to execute it.

## Building and deploying the application

### Building the application

The project uses [Gradle](https://gradle.org) as a build tool. It already contains
`./gradlew` wrapper script, so there's no need to install gradle.

To build the project execute the following command:

```bash
  ./gradlew build
```

### Running the application

Create the image of the application by executing the following command:

```bash
  ./gradlew assemble
```

Note: Docker Compose V2 is highly recommended for building and running the application.
In the Compose V2 old `docker-compose` command is replaced with `docker compose`.

Create docker image:

```bash
  docker compose build
```

Run the distribution (created in `build/install/spring-boot-template` directory)
by executing the following command:

```bash
  docker compose up
```

This will start the API container exposing the application's port
(set to `4550` in this template app).

In order to test if the application is up, you can call its health endpoint:

```bash
  curl http://localhost:4550/health
```

You should get a response similar to this:

```
  {"status":"UP","diskSpace":{"status":"UP","total":249644974080,"free":137188298752,"threshold":10485760}}
```

### Alternative script to run application

To skip all the setting up and building, just execute the following command:

```bash
./bin/run-in-docker.sh
```

For more information:

```bash
./bin/run-in-docker.sh -h
```

Script includes bare minimum environment variables necessary to start api instance. Whenever any variable is changed or any other script regarding docker image/container build, the suggested way to ensure all is cleaned up properly is by this command:

```bash
docker compose rm
```

It clears stopped containers correctly. Might consider removing clutter of images too, especially the ones fiddled with:

```bash
docker images

docker image rm <image-id>
```

There is no need to remove postgres and java or similar core images.

## License

This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details

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