OGNL

Since Camel 1.1

Camel allows OGNL to be used as an Expression or Predicate the DSL or Xml Configuration.

You could use OGNL to create an Predicate in a Message Filter or as an Expression for a Recipient List

You can use OGNL dot notation to invoke operations. If you for instance have a body that contains a POJO that has a getFamilyName method then you can construct the syntax as follows:

"request.body.familyName"
   // or
"getRequest().getBody().getFamilyName()"

OGNL Options

The OGNL 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

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

Samples

For example you could use OGNL inside a Message Filter in XML

<route>
  <from uri="seda:foo"/>
  <filter>
    <ognl>request.headers.foo == 'bar'</ognl>
    <to uri="seda:bar"/>
  </filter>
</route>

And the sample using Java DSL:

   from("seda:foo").filter().ognl("request.headers.foo == 'bar'").to("seda:bar");

Loading script from external resource

Since 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").ognl("resource:classpath:myognl.txt")

Dependencies

To use OGNL in your camel routes you need to add the a dependency on camel-ognl which implements the OGNL 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-ognl</artifactId>
  <version>x.x.x</version>
</dependency>

Otherwise, you’ll also need OGNL

Spring Boot Auto-Configuration

When using ognl with Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-ognl-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 2 options, which are listed below.

Name Description Default Type

camel.language.ognl.enabled

Whether to enable auto configuration of the ognl language. This is enabled by default.

Boolean

camel.language.ognl.trim

Whether to trim the value to remove leading and trailing whitespaces and line breaks

true

Boolean