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Kotlin version of the Spring PetClinic Sample Application Build Status

This is a Kotlin version of the spring-petclinic Application.

Technologies used

  • Language: Kotlin
  • Core framework: Spring Boot 2.0 with Spring Framework 5 Kotlin support
  • Server: Netty
  • Web framework: Spring MVC
  • Templates: Thymeleaf and Bootstrap
  • Persistence : Spring Data JPA
  • Databases: H2 and MySQL both supported
  • Build: Gradle Script with the Kotlin DSL
  • Testing: Junit 5, Mockito and AssertJ

Running petclinic locally

	git clone
	cd spring-petclinic-kotlin
	./gradlew bootRun

You can then access petclinic here: http://localhost:8080/


In case you find a bug/suggested improvement for Spring Petclinic

Our issue tracker is available here:

Database configuration

In its default configuration, Petclinic uses an in-memory database (HSQLDB) which gets populated at startup with data. A similar setup is provided for MySql in case a persistent database configuration is needed. Note that whenever the database type is changed, the file needs to be updated and the mysql-connector-java artifact from the pom.xml needs to be uncommented.

You could start a MySql database with docker:

docker run -e MYSQL_ROOT_PASSWORD=petclinic -e MYSQL_DATABASE=petclinic -p 3306:3306 mysql:5.7

Looking for something in particular?

Features Class, files or Java property files
The Main Class PetClinicApplication
Properties configuration file
Gradle build script with Kotlin DSL build.gradle.kts
Caching Configuration CacheConfig

Import and run the project in IntelliJ IDEA

  • Make sure you have at least IntelliJ IDEA 2017.2 and IDEA Kotlin plugin 1.1.60+ (menu Tools -> Kotlin -> configure Kotlin Plugin Updates -> make sure "Stable" channel is selected -> check for updates now -> restart IDE after the update)
  • Import it in IDEA as a Gradle project
    • Go to the menu "File -> New -> Project from Existing Sources... "
    • Select the spring-petclinic-kotlin directory then choose "Import the project from Gradle"
    • Select the "Use gradle wrapper task configuration" radio button
  • In IntelliJ IDEA, right click on PetClinicApplication.kt then "Run..." or "Debug..."
  • Open http://localhost:8080/ in your browser


Interesting Spring Petclinic forks

The Spring Petclinic master branch in the main spring-projects GitHub org is the "canonical" implementation, currently based on Spring Boot and Thymeleaf.

This spring-petclinic-kotlin project is one of the several forks hosted in a special GitHub org: spring-petclinic. If you have a special interest in a different technology stack that could be used to implement the Pet Clinic then please join the community there.

Link Main technologies
spring-petclinic "Canonical" implementation of Spring Petclinic based on Spring Boot and Thymeleaf
spring-framework-petclinic Spring Framework XML configuration, JSP pages, 3 persistence layers: JDBC, JPA and Spring Data JPA
javaconfig branch Same frameworks as the spring-framework-petclinic but with Java Configuration instead of XML
spring-petclinic-angularjs AngularJS 1.x, Spring Boot and Spring Data JPA
spring-petclinic-angular Angular 4 front-end of the Petclinic REST API spring-petclinic-rest
spring-petclinic-microservices Distributed version of Spring Petclinic built with Spring Cloud
spring-petclinic-reactjs ReactJS (with TypeScript) and Spring Boot
spring-petclinic-graphql GraphQL version based on React Appolo, TypeScript and GraphQL Spring boot starter
spring-petclinic-kotlin Kotlin version of spring-petclinic
spring-petclinic-rest Backend REST API

Interaction with other open source projects

One of the best parts about working on the Spring Petclinic application is that we have the opportunity to work in direct contact with many Open Source projects. We found some bugs/suggested improvements on various topics such as Spring, Spring Data, Bean Validation and even Eclipse! In many cases, they've been fixed/implemented in just a few days. Here is a list of them:

Name Issue
Spring JDBC: simplify usage of NamedParameterJdbcTemplate SPR-10256 and SPR-10257
Bean Validation / Hibernate Validator: simplify Maven dependencies and backward compatibility HV-790 and HV-792
Spring Data: provide more flexibility when working with JPQL queries DATAJPA-292


The issue tracker is the preferred channel for bug reports, features requests and submitting pull requests.

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