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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");

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New for Camel 2.12.1
JaxbDataFormat now allows you to customize the XMLStreamWriter used to marshal the stream to XML. Using this configuration, you can add your own stream writer to completely remove, escape, or replace non-xml characters.

   JaxbDataFormat customWriterFormat = new JaxbDataFormat("org.apache.camel.foo.bar");
  customWriterFormat.setXmlStreamWriterWrapper(new TestXmlStreamWriter());

The following example shows using the Spring DSL and also enabling Camel's NonXML filtering:

<bean id="testXmlStreamWriterWrapper" class="org.apache.camel.jaxb.TestXmlStreamWriter"/>
<jaxb filterNonXmlChars="true"  contextPath="org.apache.camel.foo.bar" xmlStreamWriterWrapper="#testXmlStreamWriterWrapper" />

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For example in Spring XML we can define a Map with the mapping. In the mapping file below, we map SOAP to use soap as prefix. While our custom namespace "http://www.mycompany.com/foo/2" is not using any prefix.

  <util:map id="myMap">
    <entry key="http://www.w3.org/2003/05/soap-envelope" value="soap"/>
    <!-- we dont want any prefix for our namespace -->
    <entry key="http://www.mycompany.com/foo/2" value=""/>
  </util:map>

To use this in JAXB or SOAP you refer to this map, using the namespacePrefixRef attribute as shown below. Then Camel will lookup in the Registry a java.util.Map with the id "myMap", which was what we defined above.

  <marshal>
    <soapjaxb version="1.2" contextPath="com.mycompany.foo" namespacePrefixRef="myMap"/>
  </marshal>

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Using the Java DSL, you can configure it in the following way:

JaxbDataFormat jaxbDataFormat = new JaxbDataFormat();
jaxbDataFormat.setContextPath(Person.class.getPackage().getName());
jaxbDataFormat.setSchema("classpath:person.xsd,classpath:address.xsd");

You can do the same using the XML DSL:

<marshal>
    <jaxb id="jaxb" schema="classpath:person.xsd,classpath:address.xsd"/>
</marshal>

Camel will create and pool the underling SchemaFactory instances on the fly, because the SchemaFactory shipped with the JDK is not thread safe.
However, if you have a SchemaFactory implementation which is thread safe, you can configure the JAXB data format to use this one:

JaxbDataFormat jaxbDataFormat = new JaxbDataFormat();
jaxbDataFormat.setSchemaFactory(thradSafeSchemaFactory);

Schema Location

Available as of Camel 2.14

The JAXB Data Format supports to specify the SchemaLocation when marshaling the XML. 

Using the Java DSL, you can configure it in the following way:

JaxbDataFormat jaxbDataFormat = new JaxbDataFormat();
jaxbDataFormat.setContextPath(Person.class.getPackage().getName());
jaxbDataFormat.setSchemaLocation("schema/person.xsd");

You can do the same using the XML DSL:

<marshal>
    <jaxb id="jaxb" schemaLocation="schema/person.xsd"/>
</marshal>

Dependencies

To use JAXB in your camel routes you need to add the a dependency on camel-jaxb which implements this data format.

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-jaxb</artifactId>
  <version>x.x.x</version>
</dependency>