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Chapter 179. Validation

Validation Component
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The Validation component performs XML validation of the message body using the JAXP Validation API and based on any of the supported XML schema languages, which defaults to XML Schema
Note that the Jing component also supports the following useful schema languages:
The MSV component also supports RelaxNG XML Syntax.

URI format
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validator:someLocalOrRemoteResource
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Where someLocalOrRemoteResource is some URL to a local resource on the classpath or a full URL to a remote resource or resource on the file system which contains the XSD to validate against. For example:
Maven users will need to add the following dependency to their pom.xml for this component when using Camel 2.8 or older: 
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-spring</artifactId>
    <version>2.17.0.redhat-630xxx</version>
    <!-- use the same version as your Camel core version -->
</dependency>
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From Camel 2.9 onwards the Validation component is provided directly in the camel-core.

Options
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Expand
Option Default Description
resourceResolverFactory DefaultValidatorResourceResolverFactory Camel 2.17: Reference to a org.apache.camel.component.validator.ValidatorResourceResolverFactory which creates a resource resolver per endpoint. The default implementation creates an instance of org.apache.camel.component.validator.DefaultLSResourceResolver per endpoint which creates the default resource resolver org.apache.camel.component.validator.DefaultLSResourceResolver. The default resource resolver reads the schema files from the classpath and the file system. This option instead of the option resourceResolver shall be used when the resource resolver depends on the resource URI of the root schema document specified in the endpoint; for example, if you want to extend the default resource resolver. This option is also available on the Validator component, so that you can set the resource resolver factory only once for all endpoints.
resourceResolver null Camel 2.9: Reference to a org.w3c.dom.ls.LSResourceResolver in the Registry.
useDom false Apache Camel 2.0: Whether DOMSource/{{DOMResult}} or SaxSource/{{SaxResult}} should be used by the validator.
useSharedSchema true Camel 2.3: Whether the Schema instance should be shared or not. This option is introduced to work around a JDK 1.6.x bug. Xerces should not have this issue.
failOnNullBody true Camel 2.9.5/2.10.3: Whether to fail if no body exists.
headerName null Camel 2.11: To validate against a header instead of the message body.
failOnNullHeader true Camel 2.11: Whether to fail if no header exists when validating against a header.

Example
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The following example shows how to configure a route from endpoint direct:start which then goes to one of two endpoints, either mock:valid or mock:invalid based on whether or not the XML matches the given schema (which is supplied on the classpath). 
    <route>
        <from uri="direct:start"/>
        <doTry>
            <to uri="validator:org/apache/camel/component/validator/schema.xsd"/>
            <to uri="mock:valid"/>
            <doCatch>
                <exception>org.apache.camel.ValidationException</exception>
                <to uri="mock:invalid"/>
            </doCatch>
            <doFinally>
                <to uri="mock:finally"/>
            </doFinally>
        </doTry>
    </route>
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Advanced: JMX method clearCachedSchema
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Since Camel 2.17, you can force that the cached schema in the validator endpoint is cleared and reread with the next process call with the JMX operation clearCachedSchema. You can also use this method to programatically clear the cache. This method is available on the ValidatorEndpoint class.
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