Error when injecting Service within a @Component

Question

Set an example bean:

@Component
public class SimulationModelFactory {

and within the class I am injecting my service example:

@Autowired
private SimulationFlowService simulationFlowService;

Service always stays null

Answer 1

The annotation @Autowired will try to inject some class that implements the interface SimulationFlowService (or the classes themselves).

Note that your class SimulationModelFactory is neither. Try to write down @Component in a class that implements the interface.