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  • org.apache.camel.impl.JavaUuidGenerator - This implementation uses java.util.UUID. The java.util.UUID is synchronized and can therefore affect performance on high concurrent systems. Therefore consider one of the generators.
  • org.apache.camel.impl.SimpleUuidGenerator - This implementation use internally a java.util.concurrent.atomic.AtomicLong and increase the ID for every call by one. Starting with 1 as the first id.
  • org.apache.camel.impl.ActiveMQUuidGenerator - This implementation use the ActiveMQ style of ID's. This implementation may use some APIs from the JDK which is forbidden to use if running in the cloud (such as Google App Engine) and therefore you may have to use one of the other generators.

ActiveMQUuidGenerator

From Camel 2.10.7/2.11.1 onwards the JVM system property with key: activemq.idgenerator.port can be used to assign a specific port which is used during initialization of the UUID generator. By default the port number 0 is used. Though in some cloud infrastructures this is not allowed, and thus a specific port can be assigned instead.

The default generator

From Camel 2.5 onwards the ActiveMQUuidGenerator is the default generator because its the fastest.
In Camel 2.4 or older the default is the JavaUuidGenerator generator.
In Camel 1.x the default generator is likewise the ActiveMQUuidGenerator.