Module javafx.web
Package javafx.scene.web

## Class WebErrorEvent

- java.lang.Object
- - java.util.EventObject
  - - javafx.event.Event
    - - javafx.scene.web.WebErrorEvent

- All Implemented Interfaces:
    `Serializable`, `Cloneable`

      public final class WebErrorEvent
      extends Event

  An event indicating a `WebEngine` error. Holds an optional text message and an optional exception associated with the error.
  Since:
    JavaFX 8.0
  See Also:
    `WebEngine.onError`, Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `static EventType<WebErrorEvent>` | `ANY` | Common supertype for all `WebErrorEvent` types.
    `static EventType<WebErrorEvent>` | `USER_DATA_DIRECTORY_ALREADY_IN_USE` | This event occurs when a `WebEngine` detects that its user data directory is already in use by a `WebEngine` running in a different VM.
    `static EventType<WebErrorEvent>` | `USER_DATA_DIRECTORY_IO_ERROR` | This event occurs when a `WebEngine` encounters an I/O error while trying to create or access the user data directory.
    `static EventType<WebErrorEvent>` | `USER_DATA_DIRECTORY_SECURITY_ERROR` | This event occurs when a `WebEngine` encounters a security error while trying to create or access the user data directory.

    - ### Fields inherited from class javafx.event.Event

      `consumed, eventType, NULL_SOURCE_TARGET, target`

    - ### Fields inherited from class java.util.EventObject

      `source`

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `WebErrorEvent​(Object source, EventType<WebErrorEvent> type, String message, Throwable exception)` | Creates a new `WebErrorEvent`.

  - ### Method Summary

    Modifier and Type | Method | Description
    --- | --- | ---
    `Throwable` | `getException()` | Returns the exception associated with this event.
    `String` | `getMessage()` | Returns the text message associated with this event.
    `String` | `toString()`

    - ### Methods inherited from class javafx.event.Event

      `clone, consume, copyFor, fireEvent, getEventType, getTarget, isConsumed`

    - ### Methods inherited from class java.util.EventObject

      `getSource`

    - ### Methods inherited from class java.lang.Object

      `equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### ANY

          public static final EventType<WebErrorEvent> ANY

      Common supertype for all `WebErrorEvent` types.

    - #### USER_DATA_DIRECTORY_ALREADY_IN_USE

          public static final EventType<WebErrorEvent> USER_DATA_DIRECTORY_ALREADY_IN_USE

      This event occurs when a `WebEngine` detects that its user data directory is already in use by a `WebEngine` running in a different VM.

      In general, multiple `WebEngine` instances may share a single user data directory as long as they run in the same VM. `WebEngine` instances running in different VMs are not allowed to share the same user data directory.

      When a `WebEngine` is about to start loading a web page or executing a script for the first time, it checks whether its `userDataDirectory` is already in use by a `WebEngine` running in a different VM. If the latter is the case, the `WebEngine` invokes the `WebEngine.onError` event handler, if any, with a `USER_DATA_DIRECTORY_ALREADY_IN_USE` event. If the invoked event handler modifies the `userDataDirectory` property, the `WebEngine` retries with the new user data directory as soon as the handler returns. If the handler does not modify the `userDataDirectory` property (which is the default), the `WebEngine` continues without the user data directory.

    - #### USER_DATA_DIRECTORY_IO_ERROR

          public static final EventType<WebErrorEvent> USER_DATA_DIRECTORY_IO_ERROR

      This event occurs when a `WebEngine` encounters an I/O error while trying to create or access the user data directory.

      When a `WebEngine` is about to start loading a web page or executing a script for the first time, it checks whether it can create or access its `userDataDirectory`. If the check fails with an I/O error (such as `java.io.IOException`), the `WebEngine` invokes the `WebEngine.onError` event handler, if any, with a `USER_DATA_DIRECTORY_IO_ERROR` event. If the invoked event handler modifies the `userDataDirectory` property, the `WebEngine` retries with the new user data directory as soon as the handler returns. If the handler does not modify the `userDataDirectory` property (which is the default), the `WebEngine` continues without the user data directory.

    - #### USER_DATA_DIRECTORY_SECURITY_ERROR

          public static final EventType<WebErrorEvent> USER_DATA_DIRECTORY_SECURITY_ERROR

      This event occurs when a `WebEngine` encounters a security error while trying to create or access the user data directory.

      When a `WebEngine` is about to start loading a web page or executing a script for the first time, it checks whether it can create or access its `userDataDirectory`. If the check fails with a security error (such as `java.lang.SecurityException`), the `WebEngine` invokes the `WebEngine.onError` event handler, if any, with a `USER_DATA_DIRECTORY_SECURITY_ERROR` event. If the invoked event handler modifies the `userDataDirectory` property, the `WebEngine` retries with the new user data directory as soon as the handler returns. If the handler does not modify the `userDataDirectory` property (which is the default), the `WebEngine` continues without the user data directory.

  - ### Constructor Detail

    - #### WebErrorEvent

          public WebErrorEvent​(Object source,
                               EventType<WebErrorEvent> type,
                               String message,
                               Throwable exception)

      Creates a new `WebErrorEvent`.
      Parameters:
        `source` - the event source which sent the event
        `type` - the event type
        `message` - the text message associated with the event; may be `null`
        `exception` - the exception associated with the event; may be `null`

  - ### Method Detail

    - #### getMessage

          public String getMessage()

      Returns the text message associated with this event.
      Returns:
        the text message associated with this event, or `null` if there is no such message

    - #### getException

          public Throwable getException()

      Returns the exception associated with this event.
      Returns:
        the exception associated with this event, or `null` if there is no such exception

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `EventObject`