Camel 2.6 or older can run on JDK 1.5 or better.
Camel 2.7 onwards requires JDK 1.6 or JDK 1.7.
Camel 2.14 onwards requires JDK 1.7 or better.
Camel 2.18 onwards requires JDK 1.8.
Apache Camel is designed to require a minimum number of dependencies for us so it is ideal for embedding into smart clients, message brokers, SOA frameworks and ESBs.
Other modules require other dependencies; such as camel-jms requires a JMS provider. To see the exact dependencies of the other modules see the Maven reports