Chapter 235. MVEL Language Available as of Camel version 2.0 Camel allows Mvel to be used as an Expression or Predicate the DSL or Xml Configuration. You could use Mvel to create an Predicate in a Message Filter or as an Expression for a Recipient List You can use Mvel dot notation to invoke operations. If you for instance have a body that contains a POJO that has a getFamiliyName method then you can construct the syntax as follows: "request.body.familyName" // or "getRequest().getBody().getFamilyName()" 235.1. Mvel Options The MVEL 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 235.2. Spring Boot Auto-Configuration The component supports 4 options, which are listed below. Name Description Default Type camel.component.mvel.enabled Enable mvel component true Boolean camel.component.mvel.resolve-property-placeholders Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders. true Boolean camel.language.mvel.enabled Enable mvel language true Boolean camel.language.mvel.trim Whether to trim the value to remove leading and trailing whitespaces and line breaks true Boolean 235.3. Variables 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) 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 235.4. Samples For example you could use Mvel inside a Message Filter in XML <route> <from uri="seda:foo"/> <filter> <mvel>request.headers.foo == 'bar'</mvel> <to uri="seda:bar"/> </filter> </route> And the sample using Java DSL: from("seda:foo").filter().mvel("request.headers.foo == 'bar'").to("seda:bar"); 235.5. 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").mvel("resource:classpath:script.mvel") 235.6. Dependencies To use Mvel in your camel routes you need to add the a dependency on camel-mvel which implements the Mvel language. 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). <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-mvel</artifactId> <version>x.x.x</version> </dependency>

Commands:
"request.body.familyName" // or "getRequest().getBody().getFamilyName()"
<route> <from uri="seda:foo"/> <filter> <mvel>request.headers.foo == 'bar'</mvel> <to uri="seda:bar"/> </filter> </route>
from("seda:foo").filter().mvel("request.headers.foo == 'bar'").to("seda:bar");
.setHeader("myHeader").mvel("resource:classpath:script.mvel")
<dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-mvel</artifactId> <version>x.x.x</version> </dependency>