For enabling external configuration, these two jvm arguments must be provided for the application:
-Dspring.profiles.active=ext.config
-Dext.config.dir=path/to/config/dir
Value of ext.config.dir must be a path on the server, containing the external configuration files. All files must end with "Config" postfix and should be a valid Spring framework XML Schema-based configuration.
For interoperability with registration system, external configuration must be enabled (see 1.)) and the xml file must be provided matching the following template:
"registrationConfig.xml"
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
 xsi:schemaLocation="
 http://www.springframework.org/schema/beans
 http://www.springframework.org/schema/beans/spring-beans.xsd">
 <bean id="cxnRegistrationSystem" class="com.chemaxon.plexus.registration.CxnRegistrationSystem">
 <constructor-arg>
 <bean class="com.chemaxon.plexus.registration.CxnRegistrationSystemConfiguration">
 <constructor-arg name="endpointUrl" value="http://localhost:8180/RegistryCxn" />
 <constructor-arg name="clientSecret" value="*****" />
 <constructor-arg name="registrationSource" value="REGISTRAR" />
 </bean>
 </constructor-arg>
 </bean>
 <bean parent="log.info" p:arguments="-- [ CxnRegistrationSystem configured successfully ] --" />
</beans>