Annotate the UI with @PreserveOnRefresh. The documentation states that unless this is used, a new UI instance is created on each page refresh.
execute a function once in vaadin
Vra
i have to develop a web application using Vaadin 7, and i have a function that store the data in the database and it should be executed just once when i run the project but not in every time i refresh the page. i try to write this function in the constructor like this:
public class Dmav_3UI extends UI {
public class Dmav_3UI extends UI {
@WebServlet(value = "/*", asyncSupported = true)
@VaadinServletConfiguration(productionMode = false, ui = Dmav_3UI.class)
public static class Servlet extends VaadinServlet {
}
}
public Dmav_3UI(){
myFunction();
}
but it still run every time i refresh the page. can you help me please?
Oplossing
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