@Lob
@Column(length = 100000)
private byte[] foto;

public byte[] getFoto() {
    return foto;
}

public void setFoto(byte[] foto) {
    this.foto = foto;
}

@GetMapping("/view")
    public ModelMap viewVehicle(@RequestParam(value = "id", required = false) Vehicle vehicle, Model model) {
        if (vehicle == null) {
            vehicle = new Vehicle();
        }

        return new ModelMap("vehicle", vehicle);
    }

<img th:src="*{'data:image/png;base64,'+ foto}" />