Spring Boot Example with Camel REST DSL and Platform HTTP

Introduction

This example illustrates how to use Spring Boot with Camel. It provides a simple REST service that is created with Camel REST DSL and platform-http.

The project uses the camel-spring-boot-starter dependency, a Spring Boot starter dependency for Camel that simplifies the Maven configuration.

The project also uses camel-servlet-starter component as the implementation for platform-http-engine.

Build

You can build this example using:

mvn package

Run

You can run this example using:

mvn spring-boot:run

You should see the following output when the application is launched (timestamp removed for simplicity):

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/

 :: Spring Boot ::                (v3.4.5)

o.a.c.example.springboot.Application     : Starting Application using Java 17.0.15 with PID 3707237
o.a.c.example.springboot.Application     : No active profile set, falling back to 1 default profile: "default"
o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port 8080 (http)
o.apache.catalina.core.StandardService   : Starting service [Tomcat]
o.apache.catalina.core.StandardEngine    : Starting Servlet engine: [Apache Tomcat/10.1.40]
o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 451 ms
o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port 8080 (http) with context path '/'
o.a.c.impl.engine.AbstractCamelContext   : Apache Camel 4.12.0-SNAPSHOT (MyCamel) is starting
o.a.c.impl.engine.AbstractCamelContext   : Routes startup (total:6 rest-dsl:6)
o.a.c.impl.engine.AbstractCamelContext   :     Started route1 (rest://get:/todos)
o.a.c.impl.engine.AbstractCamelContext   :     Started route2 (rest://get:/todos:/%7Bid%7D)
o.a.c.impl.engine.AbstractCamelContext   :     Started route3 (rest://patch:/todos:/%7Bid%7D)
o.a.c.impl.engine.AbstractCamelContext   :     Started route4 (rest://post:/todos)
o.a.c.impl.engine.AbstractCamelContext   :     Started route5 (rest://delete:/todos)
o.a.c.impl.engine.AbstractCamelContext   :     Started route6 (rest://delete:/todos:/%7Bid%7D)
o.a.c.impl.engine.AbstractCamelContext   : Apache Camel 4.12.0-SNAPSHOT (MyCamel) started in 8ms (build:0ms init:0ms start:8ms boot:428ms)
o.a.c.example.springboot.Application     : Started Application in 1.155 seconds (process running for 1.283)

After the Spring Boot application is started, you can execute the following HTTP requests:

Create a TODO

curl -d '{"title":"Todo title", "completed":"false", "order": 1, "url":""}' -H "Content-Type: application/json" -X POST http://localhost:8080/todos

The command will produce the following output:

{"id":1,"title":"Todo title","completed":false,"order":1,"url":""}

Retrieve all TODOs

curl http://localhost:8080/todos

The command will produce the following output:

[{"id":1,"title":"Todo title","completed":false,"order":1,"url":""}]

Update one TODO

curl -d '{"title":"Todo title", "completed":"true", "order": 1, "url":""}' -H "Content-Type: application/json" -X PATCH http://localhost:8080/todos/1

The command will produce the following output:

{"id":1,"title":"Todo title","completed":true,"order":1,"url":""}

Delete completed TODOs

curl -X "DELETE" http://localhost:8080/todos

The command will produce the following output:

1

The Spring Boot application can be stopped pressing [CTRL] + [C] in the shell.

Help and contributions

If you hit any problem using Camel or have some feedback, then please let us know.

We also love contributors, so get involved :-)

The Camel riders!