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Expressions and Predicates can then be used to create the various Enterprise Integration Patterns in the DSL or Xml Configuration like the Recipient List.
To support dynamic rules Camel supports pluggable Expression strategies using a variety of different Languages.


If you are outside of the DSL and want to create your own expressions you can either implement the Expression interface, reuse one of the other builders or try the ExpressionBuilder class.


The API for a Camel Expression is defined in the org.apache.camel.Expression interface as shown:


The API for a Camel Predicate is defined in the org.apache.camel.Predicate interface as shown:

Expression Languages

The following languages are supported out of the box

Most of these languages is also supported used as Annotation Based Expression Language.

Using Expressions in your IDE

To use different expression and predicates in your IDE you need to perform a static import of the builder class for the language(s) you wish to use.

See Also

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