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<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);

Dependencies

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

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