How can I register services into the default lookup using the system filesystem?
In short, you probably do not want to. The typical way of registering services is via META-INF/services registration: DevFaqLookupDefault. That method is easier to use and offers compatibility with non-platform applications via the Java Extension Mechanism. But there are some special cases when registration via the system filesystem is needed. One example might be when you want to dynamically change or unregister services, since the system filesystem is writable at runtime. Again such needs are rare and you should probably avoid doing this unless there is no alternative. (Usually the service interface should be defined so that the service itself is a singleton, but it can create other objects on demand and signal certain events.) Another minor use case is to register several services with the same implementation class but different parameters; META-INF/services registrations require a zero-argument constructor, meaning you need a different implementation class for each distinct service
