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A sample Spring-based application

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Spring PetClinic Sample Application Build Status

Understanding the Spring Petclinic application with a few diagrams

See the presentation here

Running petclinic locally

Petclinic is a Spring Boot application built using Maven. You can build a jar file and run it from the command line (it should work just as well with Java 8, 11 or 17):

git clone
cd spring-petclinic
./mvnw package
java -jar target/*.jar

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


Or you can run it from Maven directly using the Spring Boot Maven plugin. If you do this it will pick up changes that you make in the project immediately (changes to Java source files require a compile as well - most people use an IDE for this):

./mvnw spring-boot:run

NOTE: Windows users should set

git config core.autocrlf true
to avoid format assertions failing the build (use
to set that flag globally).

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 (H2) which gets populated at startup with data. The h2 console is automatically exposed at

and it is possible to inspect the content of the database using the

A similar setup is provided for MySql in case a persistent database configuration is needed. Note that whenever the database type is changed, the app needs to be run with a different profile:
for MySql.

You could start MySql locally with whatever installer works for your OS, or with docker:

docker run -e MYSQL_USER=petclinic -e MYSQL_PASSWORD=petclinic -e MYSQL_ROOT_PASSWORD=root -e MYSQL_DATABASE=petclinic -p 3306:3306 mysql:5.7.8

Further documentation is provided here.

Working with Petclinic in your IDE


The following items should be installed in your system: * Java 8 or newer (full JDK not a JRE). * git command line tool ( * Your preferred IDE * Eclipse with the m2e plugin. Note: when m2e is available, there is an m2 icon in

Help -> About
dialog. If m2e is not there, just follow the install process here: * Spring Tools Suite (STS) * IntelliJ IDEA * VS Code


1) On the command line

    git clone
2) Inside Eclipse or STS
    File -> Import -> Maven -> Existing Maven project
Then either build on the command line `./mvnw generate-resources` or using the Eclipse launcher (right click on project and `Run As -> Maven install`) to generate the css. Run the application main method by right clicking on it and choosing `Run As -> Java Application`.

3) Inside IntelliJ IDEA In the main menu, choose 

File -> Open
and select the Petclinic pom.xml. Click on the
CSS files are generated from the Maven build. You can either build them on the command line `./mvnw generate-resources` or right click on the `spring-petclinic` project then `Maven -> Generates sources and Update Folders`.

A run configuration named PetClinicApplication should have been created for you if you're using a recent Ultimate version. Otherwise, run the application by right clicking on the PetClinicApplication main class and choosing Run 'PetClinicApplication'.

4) Navigate to Petclinic

Visit [http://localhost:8080](http://localhost:8080) in your browser.

Looking for something in particular?

|Spring Boot Configuration | Class or Java property files | |--------------------------|---| |The Main Class | PetClinicApplication | |Properties Files | | |Caching | CacheConfiguration |

Interesting Spring Petclinic branches and forks

The Spring Petclinic "main" branch in the spring-projects GitHub org is the "canonical" implementation, currently based on Spring Boot and Thymeleaf. There are quite a few forks 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.

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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The Spring PetClinic sample application is released under version 2.0 of the Apache License.

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