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In this case, the list of recipients are contained in the header 'recipientListHeader'.

And the same example in Java DSL:

  from("direct:a").recipientList(header("recipientListHeader"));

And with a slighly different syntax where you use the builder to the fullest (i.e. avoid using parameters but using stacked operations, notice that header is not a parameter but a stacked method call)

  from("direct:a").recipientList().header("recipientListHeader");