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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.

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