Apache Camel 4.6 has just been released.
This release introduces a set of new features and noticeable improvements that we will cover in this blog post.
Camel JBang
We fixed some issues using Camel JBang with Windows, but we would still like more feedback from Windows users.
Camel JBang is primary intended to be Camel standalone only. However, we added support for running with Spring Boot or Quarkus directly.
You use the --runtime option to specify which platform to use, as shown below:
$ camel run foo.camel.yaml --runtime=spring-boot
And for Quarkus:
$ camel run foo.camel.yaml --runtime=quarkus
There are several limitations, one would be that Spring Boot and Quarkus cannot automatically detect new components and download JARs. (you can stop and run again to update dependencies).
You can now also configure logging levels per package name in application.properties as shown below:
logging.level.org.apache.kafka = DEBUG
logging.level.com.foo.something = TRACE
You can also do this using Quarkus style:
quarkus.log.category."org.apache.kafka".level = DEBUG
quarkus.log.category."com.foo.something".level = TRACE
And we also made it possible to define JDBC DataSource using Spring Boot style directly in application.properties as follows:
spring.datasource.url= jdbc:sqlserver://db.example.net:1433;databaseName=test_db
spring.datasource.username=user
spring.datasource.password=password
spring.datasource.driverClassName=com.microsoft.sqlserver.jdbc.SQLServerDriver
DSL
The XML and YAML DSL now have harmonized defining beans in both routes and kamelets to be the same which makes it possible to define beans using constructors, properties, builders, factory beans, scripts and much more, all in the same way.
Added setVariables EIP to make it possible to set multiple variables from a single EIP.
Rest DSL with contract first
The Rest DSL has been improved with a contract first approach using vanilla OpenAPI specification.
The contract first approach requires you to have an existing OpenAPI v3 specification file. This contract is a standard OpenAPI contract, and you can use any existing API design tool to build such contracts.
This makes it super easy to define Rest DSL in Camel from an existing OpenAPI specification file, all you do is to declare this small piece of Rest DSL code:
For example in Java DSL:
public void configure() throws Exception {
rest().openApi("petstore-v3.json");
}
The petstore-v3.json is the OpenAPI specification file, and Camel will automatically parse and map each API endpoint to a Camel route with the direct:operationId convention.
During development of these API endpoints in Camel you can tell Camel to ignore missing routes, so you can build, run, and test this one API at a time.
Here is an example for Camel Spring Boot: https://github.com/apache/camel-spring-boot-examples/tree/main/openapi-contract-first And here is an example for YAML DSL with JBang: https://github.com/apache/camel-kamelets-examples/tree/main/jbang/open-api-contract-first
Miscellaneous
Upgraded many third-party dependencies to the latest releases at the time of release.
The camel-azure-eventbus component has been refactored to use high-level client which is more robust and have better failover and reconnection support.
The camel-sql component can now use variables in the SQL queries.
The camel-kafka component is upgraded to Kafka 3.7 client. Added JMSDeserializer to camel-kafka that users can use to let Kafka handle serializing/de-serializing JMS headers correct by their expected types (long, int, string etc.)
The camel-rest-openapi - Refactored to use another json validator library that is Jakarta EE compatible.
The Rest DSL clientRequestValidation now supports validating for allowed values as well.
The @PropertyInject can inject as an array/list type where the string value is splitted by a separator (such as a comma)
Camel Spring Boot has been upgraded to Spring Boot 3.2.5.
New Components
This release only brings two new components:
camel-google-pubsub-lite- Send and receive messages to/from Google Cloud Platform PubSub Lite Service.camel-pinecone- Perform operations on the Pinecone Vector Database.
Upgrading
Make sure to read the upgrade guide if you are upgrading from a previous Camel version.
If you are upgrading from, for example, 4.0 to 4.4, then make sure to follow the upgrade guides for each release in-between, i.e. 4.0 -> 4.1, 4.1 -> 4.2, and so forth.
Release Notes
You can find more information about this release in the list of JIRA tickets resolved in the release:
Roadmap
The following 4.7 release (non LTS) is planned to upgrade to Spring Boot 3.3, and to be released in July.