Camel K supports multiple languages for writing integrations:
Integrations written in Java DSL are supported.
Integrations written in plain XML DSL are supported (Spring XML with <beans> or Blueprint XML with <blueprint> not supported).
Integrations written in YAML DSL are supported.
More information about each language is located in the language specific sections.
You can find various examples using different languages in the examples pack that is downloadable from the release page.