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If I am developing an application using DDD, where do the infrastrucure and behavior components go? For example, user management, user specific configuration, permissions, application menuing, etc.
These components really have nothing to do with the business requirements being fullfilled by my domain, but they are still required elements of my application. Many of them also require persistance.
It’s pretty normal to have non-domain components along with the domain in your project – after all not everything is business domain oriented. Where they belong actually depends on how you structure your solution. In most cases I tend to follow Onion Architecture, so all of my logic is provided by Application Services, regardless if it’s domain or non-domain oriented.