Chapter 316. SpEL Language Available as of Camel version 2.7 Camel allows Spring Expression Language (SpEL) to be used as an Expression or Predicate in the DSL or XML Configuration. Note It is recommended to use SpEL in Spring runtimes. However from Camel 2.21 onwards you can use SpEL in other runtimes (there may be functionality SpEL cannot do when not running in a Spring runtime) 316.1. Variables The following variables are available in expressions and predicates written in SpEL: Variable Type Description this Exchange the Exchange is the root object exchange Exchange the Exchange object exception Throwable the Exchange exception (if any) exchangeId String the exchange id fault Message the Fault message (if any) body Object The IN message body. request Message the exchange.in message response Message the exchange.out message (if any) properties Map the exchange properties property(name) Object the property by the given name property(name, type) Type the property by the given name as the given type 316.2. Options The SpEL language supports 1 options, which are listed below. Name Default Java Type Description trim true Boolean Whether to trim the value to remove leading and trailing whitespaces and line breaks 316.3. Samples 316.3.1. Expression templating SpEL expressions need to be surrounded by #{ } delimiters since expression templating is enabled. This allows you to combine SpEL expressions with regular text and use this as extremely lightweight template language. For example if you construct the following route: from("direct:example") .setBody(spel("Hello #{request.body}! What a beautiful #{request.headers['dayOrNight']}")) .to("mock:result"); In the route above, notice spel is a static method which we need to import from org.apache.camel.language.spel.SpelExpression.spel , as we use spel as an Expression passed in as a parameter to the setBody method. Though if we use the fluent API we can do this instead: from("direct:example") .setBody().spel("Hello #{request.body}! What a beautiful #{request.headers['dayOrNight']}") .to("mock:result"); Notice we now use the spel method from the setBody() method. And this does not require us to static import the spel method from org.apache.camel.language.spel.SpelExpression.spel . And sent a message with the string "World" in the body, and a header "dayOrNight" with value "day": template.sendBodyAndHeader("direct:example", "World", "dayOrNight", "day"); The output on mock:result will be "Hello World! What a beautiful day" 316.3.2. Bean integration You can reference beans defined in the Registry (most likely an ApplicationContext ) in your SpEL expressions. For example if you have a bean named "foo" in your ApplicationContext you can invoke the "bar" method on this bean like this: #{@foo.bar == 'xyz'} 316.3.3. SpEL in enterprise integration patterns You can use SpEL as an expression for Recipient List or as a predicate inside a Message Filter : <route> <from uri="direct:foo"/> <filter> <spel>#{request.headers['foo'] == 'bar'}</spel> <to uri="direct:bar"/> </filter> </route> And the equivalent in Java DSL: from("direct:foo") .filter().spel("#{request.headers['foo'] == 'bar'}") .to("direct:bar"); 316.4. Loading script from external resource Available as of 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" , eg to refer to a file on the classpath you can do: .setHeader("myHeader").spel("resource:classpath:myspel.txt")

Commands:
from("direct:example") .setBody(spel("Hello #{request.body}! What a beautiful #{request.headers['dayOrNight']}")) .to("mock:result");
from("direct:example") .setBody().spel("Hello #{request.body}! What a beautiful #{request.headers['dayOrNight']}") .to("mock:result");
template.sendBodyAndHeader("direct:example", "World", "dayOrNight", "day");
#{@foo.bar == 'xyz'}
<route> <from uri="direct:foo"/> <filter> <spel>#{request.headers['foo'] == 'bar'}</spel> <to uri="direct:bar"/> </filter> </route>
from("direct:foo") .filter().spel("#{request.headers['foo'] == 'bar'}") .to("direct:bar");
.setHeader("myHeader").spel("resource:classpath:myspel.txt")