Constant Expression Language
The Constant Expression Language is really just a way to specify constant strings as a type of expression.
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");
Dependencies
The Constant language is part of camel-core.