ApplicationListener (BlueJ Extensions API)

```
public interface ApplicationListener
```
This interface allows an extension to listen for application events.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`void`	`blueJReady(ApplicationEvent event)`	This method will be called when the BlueJ application is initialised.
`default void`	`dataSubmissionFailed(ApplicationEvent event)`	This method will be called when submission to the current data recording server (Blackbox, or your local purpose-run recording server) has failed.

- Method Detail
  - blueJReady
```
void blueJReady(ApplicationEvent event)
```
    This method will be called when the BlueJ application is initialised. Warning: If the extension is loaded with a Project, it will not get this event since BlueJ has already completed its initialisation when the project is loaded. Note that this method is called from the JavaFX (GUI) thread and therefore the extension must return as quickly as possible. If a long operation must be performed the extension should start a Thread.
    
    Parameters:
    
    event - the event of type ApplicationEvent.EventType.APP_READY_EVENT sent over.
  - dataSubmissionFailed
```
default void dataSubmissionFailed(ApplicationEvent event)
```
    This method will be called when submission to the current data recording server (Blackbox, or your local purpose-run recording server) has failed.
    
    Parameters:
    
    event - the event of type ApplicationEvent.EventType.DATA_SUBMISSION_FAILED_EVENT sent over.