Camel supports Groovy among other Scripting Languages to allow an Expression or Predicate to be used in the DSL or Xml Configuration.

To use a Groovy expression use the following Java code

For example you could use the groovy function to create an Predicate in a Message Filter or as an Expression for a Recipient List


You should add the camel-groovy dependeny when using Groovy language with Camel. The generic camel-script is not optimized for best Groovy experience, and hence you should add camel-groovy as dependency.

Customizing Groovy Shell

Sometimes you may need to use custom GroovyShell instance in your Groovy expressions. To provide custom GroovyShell, add implementation of the org.apache.camel.language.groovy.GroovyShellFactory SPI interface to your Camel registry. For example after adding the following bean to your Spring context...

...Camel will use your custom GroovyShell instance (containing your custom static imports), instead of the default one.


And the Spring DSL:

ScriptContext Options


The JSR-223 scripting language's ScriptContext is pre-configured with the following attributes all set at ENGINE_SCOPE.






The Camel Context.



The Camel Context (cannot be used in groovy).



The current Exchange.



Camel 2.9: Function with a resolve method to make it easier to use Camels Properties component from scripts. See further below for example.



The IN message.



Deprecated: The OUT message. The OUT message is null by default. Use the IN message instead.

See Scripting Languages for the list of languages with explicit DSL support.

Passing Additional Arguments to the ScriptingEngine

Available from Camel 2.8

You can provide additional arguments to the ScriptingEngine using a header on the Camel message with the key CamelScriptArguments.


Using Properties Function

Available from Camel 2.9

If you need to use the Properties component from a script to lookup property placeholders, then its a bit cumbersome to do so. For example, to set a header name myHeader with a value from a property placeholder, whose key is taken from a header named foo.

From Camel 2.9: you can now use the properties function and the same example is simpler:

Loading Script From External Resource

Available from Camel 2.11

You can externalize the script and have Camel load it from a resource such as classpath:, file:, or http:. This is done using the following syntax: resource:scheme:location e.g. to refer to a file on the classpath you can do:

How to Get the Result from Multiple Statements Script

Available from Camel 2.14

The script engine's eval method returns a null when it runs a multi-statement script. However, Camel can look up the value of a script's result by using the key result from the value set. When writing a multi-statement script set the value of the result variable as the script return value.



To use scripting languages in your camel routes you need to add the a dependency on camel-script which integrates the JSR-223 scripting engine.

If you use maven you could just add the following to your pom.xml, substituting the version number for the latest & greatest release (see the download page for the latest versions).

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