Chapter 64. Constant Language
Available as of Camel version 1.5
The Constant Expression Language is really just a way to specify constant strings as a type of expression.
This is a fixed constant value that is only set once during starting up the route, do not use this if you want dynamic values during routing.
64.1. Constant Options
The Constant language supports 1 options which are listed below.
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Whether to trim the value to remove leading and trailing whitespaces and line breaks
64.2. Example usage
The setHeader element of the Spring DSL can utilize a constant expression like:
<route> <from uri="seda:a"/> <setHeader headerName="theHeader"> <constant>the value</constant> </setHeader> <to uri="mock:b"/> </route>
in this case, the Message coming from the seda:a Endpoint will have 'theHeader' header set to the constant value 'the value'.
And the same example using Java DSL:
from("seda:a") .setHeader("theHeader", constant("the value")) .to("mock:b");
The Constant language is part of camel-core.