/tap-java-spring-rest

Primary LanguageJavaMIT No AttributionMIT-0

Introduction customer-profile

customer-profile provides you an out-of-the-box application setup to implement your business logic. It is based on the commonly known 3-layered application architecture in where the package api provides the presentation layer, domain provides the services and business domain and finally the data package provides you the capability to persist your domain.

It is leveraging Spring Boot as a technology stack, which provides:

  • a way to implement REST(ful) API using Spring Web annotations
  • generation of the OpenAPI definition based on your code
  • data persistence using Spring Data JPA (now PostgreSQL is supported, but other databases can be easily added)
  • an Inversion of Control Container to wire together your classes at running without the need to write tightly-coupled code

The application contains example code implementing REST API to write and read customer profile information to and from database. This example is intended to showcase best practices around using Spring Boot and it's libraries as well as different types of tests which can be utilized to verify different parts of an application.

Prerequisites

In order to further develop this application the following tools needs to be setup:

  • Java Development Kit (https://bell-sw.com/)
  • Visual Studio Code or IntelliJ IDEA as Integrated Development Environment (IDE)
  • Tanzu Developer Tools plugin for mentioned IDE
  • Docker Desktop to execute integration tests or run the application locally

Local

Build

In order to compile the production code:

./mvnw clean compile

Database

You will need a local database running, see DATABASE.md.

Run tests

After that it is a good habit to compile the test classes and execute those tests to see if your application is still behaving as you would expect:

./mvnw verify

Start and interact

Spring Boot has its own integrated Web Server (Apache Tomcat (https://tomcat.apache.org/)). In order to start the application a database instance should be running.

Launch application using a docker-compose database instance:

./mvnw spring-boot:run

OpenApi Definition

Set the env var APP_URL to the current URL you are using, e.g. http://localhost:8080 when running a local server or the URL for the service when runing as a cloud workload.

export APP_URL=http://localhost:8080

You can access the API docs using curl:

curl $APP_URL/api-docs

Create customer profile

You can access the customer-profiles API endpoint using curl:

curl -X POST -H 'Content-Type: application/json' $APP_URL/api/customer-profiles -d '{"firstName": "Joe", "lastName": "Doe", "email": "joe.doe@test.org"}'

Get customer profile

Use the id received by previous POST call.

curl -X GET $APP_URL/api/customer-profiles/{id}

Get all customer profiles

curl -X GET $APP_URL/api/customer-profiles/

Update customer profile

Use the id received by previous creation call.

curl -X PATCH -H 'Content-Type: application/json' $APP_URL/api/customer-profiles/{id} -d '{"firstName": "Jane", "lastName": "Little"}'

Delete customer profile

Use the id received by previous creation call.

curl -X DELETE $APP_URL/api/customer-profiles/{id}

Cluster Deployment

Database

You will need a database running in yur cluster, see DATABASE.md.

Tanzu Application Platform (TAP)

Using the config/workload.yaml it is possible to build, test and deploy this application onto a Kubernetes cluster that is provisioned with Tanzu Application Platform (https://tanzu.vmware.com/application-platform).

The workload is set up by default to autoconfigure the actuators. This results in that the Spring Actuators are available at TCP port 8081 and will be used by Application Live View. Application Live View allows you see all health metrics in the TAP GUI. If you would like to have the Actuators available at TCP port 8080 you can set the annotation apps.tanzu.vmware.com/auto-configure-actuators to false.

Test Pipeline

Before deploying your application a Tekton Pipeline responsible for the testing step needs to be available in your application namespace. If your Namespace Provisioner includes a test pipeline for Java then you can rely on that, otherwise you would need to install a pipeline that is capable of building Maven or Gradle projects.

Test Pipeline with support for TestContainers

If you selected to use TestContainer for tests then a pipeline definition you can use is available in the Application Accelerators Samples java-rest-service sample.

Once that is deployed you can select it by adding a param to the workload.yaml:

  params:
    - name: testing_pipeline_matching_labels
      value:
        apps.tanzu.vmware.com/pipeline: testcontainers-java

Tanzu CLI

Using the Tanzu CLI one could apply the workload using the local sources:

tanzu apps workload apply \
  --file config/workload.yaml \
  --namespace <workload-namespace> \
  --local-path . \
  --yes \
  --tail

Note: change the namespace to where you would like to deploy this workload.

Visual Studio Code Tanzu Plugin

When developing local but would like to deploy the local code to the cluster the Tanzu Plugin could help. By using Tanzu: Apply on the workload.yaml it will create the Workload resource with the local source (pushed to an image registry) as starting point.

How to proceed from here?

Having the application locally running and deployed to a cluster you could add your domain logic, related persistence and new RESTful controller.