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Chapter 14. EL

Overview
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The Unified Expression Language (EL) was originally specified as part of the JSP 2.1 standard (JSR-245), but it is now available as a standalone language. Apache Camel integrates with JUEL (http://juel.sourceforge.net/), which is an open source implementation of the EL language.

Adding JUEL package
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To use EL in your routes you need to add a dependency on camel-juel to your project as shown in Example 14.1, “Adding the camel-juel dependency”.

Example 14.1. Adding the camel-juel dependency

<!-- Maven POM File -->
<properties>
  <camel-version>2.15.1.redhat-620133</camel-version>
  ...
</properties>

<dependencies>
  ...
  <dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-juel</artifactId>
    <version>${camel-version}</version>
  </dependency>
  ...
</dependencies>
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Static import
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To use the el() static method in your application code, include the following import statement in your Java source files: 
import static org.apache.camel.language.juel.JuelExpression.el;
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Variables
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Table 14.1, “EL variables” lists the variables that are accessible when using EL.
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Table 14.1. EL variables
VariableTypeValue
exchange org.apache.camel.Exchange The current Exchange
in org.apache.camel.Message The IN message
out org.apache.camel.Message The OUT message

Example
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Example 14.2, “Routes using EL” shows two routes that use EL.

Example 14.2. Routes using EL

<camelContext>
  <route>
    <from uri="seda:foo"/>
    <filter>
      <language language="el">${in.headers.foo == 'bar'}</language>
      <to uri="seda:bar"/>
    </filter>
  </route>
  <route>
    <from uri="seda:foo2"/>
    <filter>
      <language language="el">${in.headers['My Header'] == 'bar'}</language>
      <to uri="seda:bar"/>
    </filter>
  </route>
</camelContext>
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