protected MessageHandler buildSAMLProtocolMessageXMLSignatureSecurityHandler()
        throws ComponentInitializationException {
        MessageHandler messageXMLSignatureHandler =
            new SAMLProtocolMessageXMLSignatureSecurityHandler();
        messageXMLSignatureHandler.initialize();
        return messageXMLSignatureHandler;
    }
<p>buildSAMLProtocolMessageXMLSignatureSecurityHandler.</p>

@return a {@link MessageHandler} object
@throws ComponentInitializationException if any.
pac4j-saml/src/main/java/org/pac4j/saml/sso/artifact/DefaultSOAPPipelineFactory.java