gzurowski commented on code in PR #1053: URL: https://github.com/apache/camel-website/pull/1053#discussion_r1294365821
########## content/blog/2023/08/camel4-whatsnew/index.md: ########## @@ -0,0 +1,218 @@ +--- +title: "Apache Camel 4 What's New (top 10)" +date: 2023-08-15 +authors: [davsclaus,gzurowski,orpiske] +categories: ["Releases"] +preview: Top 10 of what's new in Apache Camel version 4 +--- +After 10 months of development, with 3 milestones, and 2 RC releases, we are releasing Apache Camel v4 +today as LTS release. The Camel `4.0.x` is a LTS release, and we will support it for 1 year. + +This blog post highlights some noteworthy new features and improvements in Camel v4. + +The features are based on work since January 2023, which was the time when we switched `main` branch to +be Camel v4 based. Since then, we focused our effort primarily on Camel v4. + +### 1) Major Goals + +The need for Camel 4 is mainly driven by Java open source projects migrating from `javax` to `jakarta` APIs, +and to keep up with popular runtimes such as Spring Boot and Quarkus. + +1. Migrate from `javax` -> `jakarta` (JEE 10) +2. Java 17 as minimum +3. Spring Boot 3 +4. Quarkus 3 + +Camel 4 requires Java 17. We plan to support Java 21 on next LTS released by the end of this year. + +### 2) Dependency updates + +We have upgraded all 3rd party dependencies to their latest releases where possible. + +### 3) Performance optimizations + +We have improved the performance of the internal Camel routing engine and framework. + +You can find more details in this blog post [camel 4 performance improvements](/blog/2023/05/camel-4-performance-improvements). + +### 4) Camel Spring Boot + +We tested Camel 4 with Spring Boot 3.1.2, the latest release available. + +The `camel-platform-http-starter` is now using the embedded HTTP server directly from Spring Boot, instead of +using Servlet APIs as previously. + +This release also comes with our first basic (and very limited) support for Spring Boot native (AOT compilation). +See more in the [aot-basic](https://github.com/apache/camel-spring-boot-examples/tree/main/aot-basic) example. + +### 5) Camel Quarkus + +The Camel Quarkus project is working on a new release with Camel 4 support, expected later this month. +Stay tuned for their release announcements. + +### 6) Camel Main + +For users who just want to run Camel as a standalone application, we have `camel-main` which is constantly being improved. +The core in `camel-main` is reused by Camel Spring Boot, Camel Quarkus, and Camel JBang as well. + +The inclusion of an embedded HTTP server is now made easy with the new `camel-platform-http-main` module. +See more in the [camel-main](https://github.com/apache/camel-examples/tree/main/examples/main) example. + +### 7) Camel JBang + +We made a lot of improvements to Camel JBang. The `camel` CLI can now easily run with different Camel versions, for example: + + camel run foo.yaml --camel-version=3.21.0 + camel run foo.yaml --camel-version=3.20.6 + +This is very handy when, for example, you need to trouble-shoot why _something_ started failed. For instance, in occasions when +it works on version X but not on version Y, now you can quickly try to find out which version in between that started failing. + +You can also specify that `camel` CLI should use a specific Camel version by default. For example, if you have a newer version of +Camel JBang installed, but must develop and use an older release: + + camel version set 3.20.6 + +We added the following new commands: + +- `camel config`: you can use to set custom user configuration +- `camel log`: you can use to show logs of your running Camel integrations (can show logs for 1 or more Camel apps) +- `camel trace`: you can use to show message tracing of your running Camel integrations (can show logs for 1 or more Camel apps) +- `camel cmd send`: you can use to send messages to an existing running Camel integration +- `camel get route-dump`: you can use to dump routes in XML or YAML format + +We migrated the maven resolver that Camel JBang uses to the latest version, and Camel JBang will now report more accurately whether +a dependency was downloaded or resolved from a local maven repository. The `camel run` command also has a `--verbose` flag to output +more details in dependency resolution that can help during troubleshooting. + +The `camel-main` runtime now supports exporting with Kubernetes manifest and build support, to make it easier to build +container images that are ready to run on Kubernetes. + +We made many improvements to Camel JBang, making it a great way to experiment with Camel and a useful companion tool for traditional +Camel development. + +### 8) XML DSL with beans + +We have been working on to unify the YAML, XML and Java DSL, so that they have feature parity related to configuring beans. For example, +in XML DSL (`camel-xml-io`) you can now declare beans and Camel routes in the same XML file with `<camel>` as the root tag: + +```xml +<camel> + + <bean name="greeter" type="com.foo.Greeter"> + <properties> + <property key="message" value="Hello World" /> + </properties> + </bean> + + <route id="my-route"> + <from uri="direct:start"/> + <bean ref="greeter"/> + <to uri="mock:finish"/> + </route> + +</camel> +``` + +Then Camel handles the dependency injection, among the `<beans>`. + +You can also use Spring dependency injection (which is more advanced), by inlining Spring `<beans>` tag with the spring namespace. +See more in the documentation for `camel-xml-io-dsl` module. + +There is more work to be done, and we are planning to see if we can also use this to simplify migrating from legacy OSGi Blueprint +(and Spring XML files, eg `<beans>`) to the modern Camel DSL. + +### 9) New components + +- `camel-aws2-step-functions`: Manage and invoke AWS Step functions +- `camel-azure-files`: Send and receive files on Azure File Storage +- `camel-dhis2`: Integrate with DHIS2 (health-level) +- `camel-observation`: Observability using Micrometer Observation +- `camel-opensearch`: Send requests to OpenSearch +- `camel-parquet-avro`: Parquet Avro serialization and de-serialization +- `camel-platform-http-main`: Platform HTTP for Camel Main runtime +- `camel-yaml-io`: YAML DSL route dumper +- `camel-zeebe`: Integration with Camunda Zeebe + +### 10) Miscellaneous improvements + +The Camel maven plugins has been made compatible with Apache Maven 4. + +Camel 4 now requires JUnit 5 for unit tests, with the test components that have -junit5 as suffix. + +If you work with XML or JSON payloads, then you can log the body in pretty format with: + + .log("${prettyBody}") + +And in XML: + + <log message="${prettyBody}"/> + +And in YAML: + + - log: "${prettyBody}" + +We have added more _dev_console_s that provide insights into your running Camel application, which +can be used together with Camel JBang and also visible in the developer web console. + +### Migrating to Camel 4 + +Support for OSGi (via Apache Karaf) and `camel-cdi` has been removed. Review Comment: Is it worth mentioning how these technologies will be supported going forward (e.g., that Camel Karaf will continue to evolve as a separate sub-project)? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@camel.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
