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Chapter 6. Upgrading Red Hat build of Apache Camel on Spring Boot version with Camel update recipes

Migrating the code for Apache Camel on Spring Boot often involves adapting to new Camel API changes and renaming the classes. To address this, you can use Camel update recipes based on OpenRewrite. These recipes assists with manual migrations and make it more efficient.

You can update the Red Hat build of Apache Camel on Spring Boot application using Camel JBang. Camel JBang provides the camel update command. It has two main operations:

  • run: Executes the actual update process

The update process uses the Apache Camel Open Rewrite recipes. It supports following application types:

  • Plain Camel (camel-main)
  • Camel Quarkus
  • Camel Spring Boot

Here, Camel and Camel Spring Boot updates mainly use the camel-upgrade-recipes, while Camel Quarkus updates involve both the Quarkus runtime (via Rewrite Quarkus) and Apache Camel recipes.

6.1. Running Camel Updates
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To perform the update to this version, use: 

$ camel update run {camelSpringBootVersion} --runtime=spring-boot
Note

The update commands must be executed in the project directory that contains the pom.xml file.

6.1.1. Configuration Options
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You can customize the update process with several options that are available:

  • --runtime: Specifies the application type:

    • spring-boot - Camel Spring Boot applications
  • --repos: Additional Maven repositories to use during the update
  • --dry-run: Preview the changes without applying them
  • --extraActiveRecipes: Comma-separated list of additional recipe names to apply
  • --extraRecipeArtifactCoordinates: Comma-separated list of Maven coordinates for extra recipes (format: groupId:artifactId:version)
  • --help : To see all available options.

6.1.2. Updating a plain Camel application
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Following example shows how to update a plain Camel application. 

$ camel update run 4.14.4.redhat-00009 --runtime=camel-main --repos=https://myMaven/repo --extraActiveRecipes=my.first.Recipe,my.second.Recipe --extraRecipeArtifactCoordinates=ex.my.org:recipes:1.0.0

6.1.3. Updating a Spring Boot application
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You can use the following command to update a Spring Boot application. You can use the -extraActiveRecipes option to run the extra Spring Boot upgrade. 

$ camel update run 4.14.4.redhat-00009 --runtime=spring-boot --extraActiveRecipes=org.openrewrite.java.spring.boot3.UpgradeSpringBoot_3_3 --extraRecipeArtifactCoordinates=org.openrewrite.recipe:rewrite-spring:6.0.2
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