```
@Target(TYPE)
@Retention(RUNTIME)
@Inherited
public @interface PreserveOnRefresh
```
Marks a UI that should be retained when the user refreshed the browser window. By default, a new UI instance is created when refreshing, causing any UI state not captured in the URL or the URI fragment to get discarded. By adding this annotation to a UI class, the framework will instead reuse the current UI instance when a reload is detected.
Whenever a request is received that reloads a preserved UI, the UI's refresh method is invoked by the framework.
By using UIProvider.isPreservedOnRefresh(com.vaadin.server.UICreateEvent), the decision can also be made dynamically based on other parameters than only whether this annotation is present on the UI class.

Since:

7.0.0

Author:

Vaadin Ltd

Annotation Type PreserveOnRefresh