hmcts / civil-wa-task-configuration

Host DMN files for the Civil work allocation integration
MIT License
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Spring Boot application template

Build Status

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:

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

Plugins

The template contains the following plugins:

Setup

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

Notes

Since Spring Boot 2.1 bean overriding is disabled. If you want to enable it you will need to set spring.main.allow-bean-definition-overriding to true.

JUnit 5 is now enabled by default in the project. Please refrain from using JUnit4 and use the next generation

Building and deploying the application

Building the application

The project uses Gradle 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:

  ./gradlew build

Running the application

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

  ./gradlew assemble

Create docker image:

  docker-compose build

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

  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:

  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:

./bin/run-in-docker.sh

For more information:

./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:

docker-compose rm

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

docker images

docker image rm <image-id>

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

Hystrix

Hystrix is a library that helps you control the interactions between your application and other services by adding latency tolerance and fault tolerance logic. It does this by isolating points of access between the services, stopping cascading failures across them, and providing fallback options. We recommend you to use Hystrix in your application if it calls any services.

Hystrix circuit breaker

This template API has Hystrix Circuit Breaker already enabled. It monitors and manages all the@HystrixCommand or HystrixObservableCommand annotated methods inside @Component or @Service annotated classes.

Other

Hystrix offers much more than Circuit Breaker pattern implementation or command monitoring. Here are some other functionalities it provides:

Adding Git Conventions

Include the git conventions.

If you violate a convention, the git error message will report clearly the convention you should follow and provide additional information where necessary.

Optional:

In case of problems

  1. Get in touch with your Technical Lead so that they can get you unblocked
  2. If the rare eventuality that the above is not possible, you can disable enforcement of conventions using the following command

    git config --local --unset core.hooksPath

    Still, you shouldn't be doing it so make sure you get in touch with a Technical Lead soon afterwards.

License

This project is licensed under the MIT License - see the LICENSE file for details