The Apache Camel community celebrates the release 1.0.0 of Camel Quarkus!
What is Camel Quarkus?
Camel Quarkus brings the outstanding integration capabilities of Apache Camel to Quarkus - the toolkit for writing subatomically small and supersonically fast Java and Kotlin applications. In addition to memory consumption and start time improvements on stock JVMs, Quarkus also allows for compiling applications to native executables thus improving the performance characteristics even more.
Camel Quarkus is suitable not only for creating long living services and potentially short living serverless applications but also for command-style applications that execute some specific task (or wait for some specific condition) and exit.
Writing integrations has never been more joyful for developers than with Camel Quarkus:
- Easy to start with: either via code.quarkus.io or using
- The “live coding” feature, a.k.a.
mvn compile quarkus:devshortens your development iterations - check this 2 mins video
- Easy to test using JUnit 5 extensions
- Hides the complexity of the native compilation using GraalVM or Mandrell
Check our User guide!
Camel components coverage
Since the early beginnings the number of supported Camel bits went up substantially. As of Quarkus 1.0.0 and Camel 3.4, Camel Quarkus supports:
- 155 out of 350 Camel components (44%)
- 27 out of 43 Camel data formats (63%)
- 13 out of 17 Camel languages (76%)
- 17 out of 42 miscellaneous Camel components (40%)
Some of these are supported in JVM mode only - please refer to the complete list for details.
There are two ways to bootstrap and configure Camel Quarkus:
- With Camel Main
Both methods configure and start a Camel Context for you. The main difference is in how much the resulting Camel Context obeys the conventions known from Camel on other platforms. If you like to configure your routes using
camel.component.* properties, then you need to add the
camel-quarkus-main dependency and the properties will work as usual on Camel standalone or Camel Spring Boot. You may prefer this option if you used Camel before or if you are migrating from other platform.
If you rather come from the CDI side and you never wrote Camel integrations before, you may choose to use the bare bootstrap and configure your routes using CDI. You can configure Camel using CDI even if you have Camel Main in your application.
See the Bootstrap section of the User guide for more details.
CDI plays a central role in Quarkus and Camel Quarkus offers a first class support for it too. You may use
@ConfigProperty and other annotations e.g. to inject beans and configuration values to your Camel RouteBuilder’s. See the CDI section of the User guide for more details.
As mentioned above, Quarkus brings the option to compile an application to native executable. Compared to running on JVM, native applications start faster, require less memory at runtime and are also smaller on disk.
However, the native compilation with GraalVM is all but easy and straightforward. First, there are limitations for what your code and all your dependencies may or may not do. Second, the native compiler needs to be configured through many options that may not be easy to figure out and maintain.
Quarkus isolates application developers from most of those subtleties. The native compilation is driven by extensions which configure the native compiler in a way suitable for the given aspect of the application.
On Camel Quarkus, the extensions roughly correspond to camel components - i.e. if you need
camel-sql you add the
camel-quarkus-sql extension as a dependency to your application and it takes care for both pulling the
camel-sql artifact and configuring the native compiler. Extension pages document any further configuration that needs to be done by the application developer. E.g. in case of the SQL extension, the
quarkus.camel.sql.script-files property needs to be set.
Who is using Camel Quarkus?
While we mostly have only indirect information about the usage via GitHub issues, there is one prominent user, we are especially proud of: Camel K. As of Camel K 1.0, Camel Quarkus is one of the two supported runtimes and “is expected to be the default underlying runtime in the next release”.
Highlights of the release 1.0.0
- Camel 3.4.2
- Quarkus 1.7.0.Final
We wish you a lot of joy with Camel Quarkus and we look forward to your feedback and participation!