Users should be able to @Inject ServiceHandles directly. This is useful if you are injecting PerLookup objects that don't need to survive the object's constructor.

@Inject
public FooService(ServiceHandle<Calculator> calculator) {
   try (calculator) {
     this.result = calculator.getService().doExpensiveCalculation();
   }
}

Here the Calculator service is a PerLookup service that is no longer needed at all once the FooService has used it to do an expensive calculation.

Even if the Calculator service later becomes a Singleton this code still makes sense as FooService can trigger the immediate destruction of a service that's no longer needed.

It would be nice if ServiceHandle implemented AutoCloseable and could be used in try-with-resources, eg:

try (ServiceHandle<Foo> foo = serviceLocator.getServiceHandle(Foo.class) {
 ...
}

On workaround would be to create a wrapper object, called ServiceInstance.

try (ServiceInstance<Foo> foo = ServiceInstance.of(serviceLocator.getServiceHandle(Foo.class)) {
 ...
}