[CONF] Apache Camel: JAXB (page edited)

Mon, 24 Nov 2008 00:10:33 -0800

Page Edited : CAMEL : JAXB

JAXB has been edited by willem jiang (Nov 24, 2008).

Change summary:

CAMEL-1074 return the JAXBElement value by default

(View changes)

Content:

JAXB

JAXB is a Data Format which uses the JAXB2 XML marshalling standard which is included in Java 6 to unmarshal an XML payload into Java objects or to marshal Java objects into an XML payload.

Using the Java DSL

For example the following uses a named DataFormat of jaxb which is configured with a number of Java package names to initialize the JAXBContext. 

DataFormat jaxb = new JaxbDataFormat("com.acme.model");

from("activemq:My.Queue").
  unmarshal(jaxb).
  to("mqseries:Another.Queue");

You can if you prefer use a named reference to a data format which can then be defined in your Registry such as via your Spring XML file. e.g. 

from("activemq:My.Queue").
  unmarshal("myJaxbDataType").
  to("mqseries:Another.Queue");

Using Spring XML

The following example shows how to use JAXB to unmarshal using Spring configuring the jaxb data type

<camelContext id="camel" xmlns="http://activemq.apache.org/camel/schema/spring">
  <route>
    <from uri="direct:start"/>
    <unmarshal>
      <jaxb prettyPrint="true" contextPath="org.apache.camel.example"/>
    </unmarshal>
    <to uri="mock:result"/>
  </route>
</camelContext>

This example shows how to configure the data type just once and reuse it on multiple routes

<camelContext id="camel" xmlns="http://activemq.apache.org/camel/schema/spring">
  <dataFormats>
    <jaxb id="myJaxb" prettyPrint="true" contextPath="org.apache.camel.example"/>
  </dataFormats>

  <route>
    <from uri="direct:start"/>
    <marshal ref="myJaxb"/>
    <to uri="direct:marshalled"/>
  </route>
  <route>
    <from uri="direct:marshalled"/>
    <unmarshal ref="myJaxb"/>
    <to uri="mock:result"/>
  </route>

</camelContext>

Working with the ObjectFactory

If you use XJC to create the java class from the schema, you will get a ObjectFactory for you JAXB context. Since the ObjectFactory uses JAXBElement to hold the reference of the schema and element instance value, from Camel 1.5.1 jaxbDataformat will ignore the JAXBElement by default and you will get the element instance value instead of the JAXBElement object form the unmarshaled message body.
If you want to get the JAXBElement object form the unmarshaled message body, you need to set the JaxbDataFormat object's ignoreJAXBElement property to be false.

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