State Machine with Null State and Event

[rishavganguly007]

Hello, I need to create a state machine similar to this image below,

so both the state and event are stored in DB and they can be null, so if you follow the image the black dot represent a null state (ie value is null in DB itself), similary if at the same time, event is also null (E1) it goes to a new state ( in img, E1 -> S2).

So, I needed help for this scenario, like how I can handle this using the spring-statemachine.
It will be helpful if anyone can guide me on this.

Thanks,
Rishav