# For developers

{% hint style="info" %}
The for developers section within each feature gives more tech heavy information of configuring, extending or altering Valtimo via the codebase.
{% endhint %}

<details>

<summary>Zaak lifecycle events and usage</summary>

**Zaak lifecycle events (since 12.14.2)**

* The Zaken API communicates Zaak lifecycle events as Spring Application Events. It concerns the following Zaak lifecycle events:
  * DocumentLinkedToZaak
  * ZaakRolCreated
  * ZaakRolUpdated
  * ZaakCreated
  * ZaakPatched
  * ZaakStatusCreated
  * ZaakResultaatCreated
  * ZaakOpschortingUpdated
  * ZaakeigenschapCreated
  * ZaakeigenschapUpdated
  * ZaakeigenschapDeleted
  * ZaakObjectCreated

**Usage**

The events can be received using the EventListener annotation.

```kotlin
//component handling ZaakEvent
@Component
class ZaakEventHandler {

    @EventListener
    fun handleZaakCreated(event: ZaakCreated) {
        logger.info("Received ZaakCreated event: ${event.zaakId}")

        // Process the event
        processNewZaak(event)

    }
}
```

</details>