class path resource [pointsconfig.properties] cannot be opened because it does not exist

Move the pointsconfig.properties file to the resources directory.

Your problem is that you try to access to a file in the package org.stack so you need to give the full path to Spring as next:

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="locations" value="classpath:/org/stack/pointsconfig.properties"/>
</bean>