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Camel with Spring Boot AOT

This example shows how you can build and execute a native image by leveraging Spring Boot AOT to launch Camel routes written in Java, XML and YAML in native mode.

How to build

To be able to build a GraalVM Native Image, you need to have GraalVM installed on your local machine.

  1. So first, download it from https://github.com/graalvm/graalvm-ce-builds/releases, choose Java 17 and the archive corresponding to your platform.

  2. Then, sets the environment variable JAVA_HOME to the home directory of GraalVM.

  3. Finally, install native-image with the command $JAVA_HOME/bin/gu install native-image

Once, the 3 steps done properly, you can build the application with the next command:

mvn -Pnative native:compile

Building a GraalVM Native Image is a relatively slow process, so be patient, it should take a couple of minutes.

How to run

A GraalVM Native Image is a complete, platform-specific executable. At this point, you don’t need any Java Virtual Machine to launch your application.

So just, launch the executable file created in the target directory as next:

./target/camel-example-spring-boot-aot-basic

Your application will start in native mode. The output of the application should be of the next type:

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v3.1.0)

2023-06-22T20:22:57.135+02:00  INFO 12741 --- [           main] sample.camel.Application                 : Starting AOT-processed Application using Java 17.0.7 with PID 12741 (xxx/camel-spring-boot-examples/aot-basic/target/camel-example-spring-boot-aot-basic started by yyy in xxx/camel-spring-boot-examples/aot-basic)
2023-06-22T20:22:57.135+02:00 DEBUG 12741 --- [           main] sample.camel.Application                 : Running with Spring Boot v3.1.0, Spring v6.0.9
2023-06-22T20:22:57.135+02:00  INFO 12741 --- [           main] sample.camel.Application                 : No active profile set, falling back to 1 default profile: "default"
2023-06-22T20:22:57.155+02:00 DEBUG 12741 --- [           main] o.a.c.i.h.DefaultHealthCheckRegistry     : HealthCheckRepository with id registry-health-check-repository successfully registered
2023-06-22T20:22:57.251+02:00  INFO 12741 --- [           main] o.a.c.impl.engine.AbstractCamelContext   : Apache Camel 4.0.0-SNAPSHOT (MyCamelNative) is starting
2023-06-22T20:22:57.251+02:00  INFO 12741 --- [           main] c.s.b.CamelSpringBootApplicationListener : Starting CamelMainRunController to ensure the main thread keeps running
2023-06-22T20:22:57.251+02:00  INFO 12741 --- [inRunController] org.apache.camel.main.MainSupport        : Apache Camel (Main) 4.0.0-SNAPSHOT is starting
2023-06-22T20:22:57.265+02:00  INFO 12741 --- [           main] o.a.c.impl.engine.AbstractCamelContext   : Routes startup (started:3)
2023-06-22T20:22:57.266+02:00  INFO 12741 --- [           main] o.a.c.impl.engine.AbstractCamelContext   :     Started helloJava (timer://java)
2023-06-22T20:22:57.266+02:00  INFO 12741 --- [           main] o.a.c.impl.engine.AbstractCamelContext   :     Started helloYAML (timer://yaml)
2023-06-22T20:22:57.266+02:00  INFO 12741 --- [           main] o.a.c.impl.engine.AbstractCamelContext   :     Started helloXML (timer://xml)
2023-06-22T20:22:57.266+02:00  INFO 12741 --- [           main] o.a.c.impl.engine.AbstractCamelContext   : Apache Camel 4.0.0-SNAPSHOT (MyCamelNative) started in 14ms (build:0ms init:0ms start:14ms)
2023-06-22T20:22:57.266+02:00  INFO 12741 --- [           main] sample.camel.Application                 : Started Application in 0.144 seconds (process running for 0.159)
2023-06-22T20:22:58.258+02:00  INFO 12741 --- [ - timer://java] helloJava                                : Hello World From Java I am invoked 1 times at Thu Jun 22 20:22:58 CEST 2023
2023-06-22T20:22:58.269+02:00  INFO 12741 --- [ - timer://yaml] demo-route.camel.yaml:6                        : Hello World from YAML at Thu Jun 22 20:22:58 CEST 2023
2023-06-22T20:22:58.269+02:00  INFO 12741 --- [3 - timer://xml] my-route.xml:30                          : Hello World From XML at Thu Jun 22 20:22:58 CEST 2023

As you can see the application took only 159 milliseconds to fully start while the exact same application in JVM mode starts in more than 2 seconds.

For more details, please check the related Spring Boot documentation.

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!