Camel 4 Support

[turing85]

Camel 4.0.0 has been released on 2023-08-14. As of now, this is the current LTS. The next LTS (4.4.0) is expected to be released in Jan/Feb 2024.

The new release broght some changes. The most notably change is the switch from javax to jakarta. But internal APIs of camel changed as well. The most notable changes are listed in the official migration guide (camel.apache.org).

It is desirable to support Camel in version 4.0.0.

[turing85]

So I started migrating things. commons, and the spring look good (there was not really anything to migrate in common-test).

The other two modules, however (blueprint and cdi) give me trouble. For one, there is an unresolved property fest.assert.version. For another, camel-cdi has been removed. Alternatives are camel-spring and camel-quarkus. I tried migrating camel-cdi to camel-quarkus, with limited success. I think that if we want to go down this route, we'd need to rewrite the tests for camel-quarkus "in the quarkus way", i.e. with junit5 and @QuarkusTest.

I'd like to have some opinons and pointers, however, before I start this part of the migration. The progress can be seen in my fork (github.com).