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Chapter 24. The Object-Graph Navigation Language(OGNL)
Overview Copia collegamentoCollegamento copiato negli appunti!
OGNL is an expression language for getting and setting properties of Java objects. You use the same expression for both getting and setting the value of a property. The OGNL support is in the camel-ognl
module.
Camel on EAP deployment Copia collegamentoCollegamento copiato negli appunti!
This component is supported by the Camel on EAP (Wildfly Camel) framework, which offers a simplified deployment model on the Red Hat JBoss Enterprise Application Platform (JBoss EAP) container.
Adding the OGNL module Copia collegamentoCollegamento copiato negli appunti!
To use OGNL in your routes you need to add a dependency on camel-ognl
to your project as shown in Example 24.1, “Adding the camel-ognl dependency”.
Example 24.1. Adding the camel-ognl dependency
Static import Copia collegamentoCollegamento copiato negli appunti!
To use the ognl()
static method in your application code, include the following import statement in your Java source files:
import static org.apache.camel.language.ognl.OgnlExpression.ognl;
import static org.apache.camel.language.ognl.OgnlExpression.ognl;
Built-in variables Copia collegamentoCollegamento copiato negli appunti!
Table 24.1, “OGNL variables” lists the built-in variables that are accessible when using OGNL.
Name | Type | Description |
---|---|---|
|
| The current Exchange |
|
| The current Exchange |
|
| the Exchange exception (if any) |
|
| the Exchange ID |
|
| The Fault message(if any) |
|
| The IN message |
|
| The OUT message |
|
| The Exchange properties |
|
| The value of the named Exchange property |
|
| The typed value of the named Exchange property |
Example Copia collegamentoCollegamento copiato negli appunti!
Example 24.2, “Route using OGNL” shows a route that uses OGNL.
Example 24.2. Route using OGNL