vaadin

I have some Vaadin code blocking very often here, and I have no idea what the problem can be: Thread 7892: (state = IN_JAVA) - java.util.HashMap.getEntry(java.lang.Object) @bci=61, line=349 (Compiled frame; information may be imprecise) - java.util.HashMap.containsKey(java.lang.Object) @bci=2, line=335 (Compiled frame) - java.util.HashSet.contains(java.lang.Object) @bci=5, line=184 (Compiled frame) - com.vaadin.ui.Table.unregisterPropertiesAndComponents(java.util.HashSet, java.util.HashSet) @bci=85, line=1693 (Compiled frame) - com.vaadin.ui.Table.refreshRenderedCells() @bci=992, line=1641

From my Vaadin 8 web app, I want the user to be able to open a report in another window, by clicking a button. The contents are to be generated by the Vaadin app using plain HTML5 rather than using Vaadin widgets. The Vaadin 8 manual has a page Handling Browser Windows . Its shows the use of a BrowserWindowOpener object to open a new window. But that window contains a Vaadin UI subclass, whereas I want to generate my own HTML content. Bonus points for passing information such as a database identifier value. Here is an entire example app, built in Vaadin 8.5.1. We present a UUID as text in a

How do I access the current ServletContext from within my Vaadin 7 app? I want to use the ServletContext object’s setAttribute , getAttribute , removeAttribute , and getAttributeNames methods to manage some global state for my Vaadin app. Also, if using those methods for that purpose is inappropriate for Vaadin apps, please explain. Basil Bourque tl;dr For both Vaadin 7, 8 and 10: VaadinServlet.getCurrent().getServletContext() VaadinServlet The VaadinServlet class inherits a getServletContext method. To get the VaadinServlet object, call the static class method getCurrent . From most anywhere

As Vaadin is a Java web application framework, so is it possible to insert the jQuery javascript snippet in the Vaadin Java code? Yes it is. Create your own ApplicationServlet extending class like this: public class MyApplicationServlet extends ApplicationServlet { @Override protected void writeAjaxPageHtmlVaadinScripts(Window window, String themeName, Application application, BufferedWriter page, String appUrl, String themeUri, String appId, HttpServletRequest request) throws ServletException, IOException { page.write("<script type=\"text/javascript\">\n"); page.write("//<![CDATA[\n"); page

I want to share the same set of data to multiple clients. I need to use Push to automatically update their view on screen. I have read the Question and Answer, Minimal example of Push in Vaadin 7 app (“@Push”) . Now I need a more robust realistic example. For one thing, I know having a never-ending Thread is not a good idea in a Servlet environment. And I don't want each user having their own Thread, each hitting the database on their own. Seems more logical to have one thread alone checking for fresh data in the database. When found, that thread should publish the fresh data to all the users’

I want to see the most minimal example of using the new Push technology in Vaadin 7, such as the new @Push annotation. I am having problems getting server-push to work in my app. I would like to try a simple example app before trying to fix my own app. Basil Bourque Simplification Of Example In The Book Of Vaadin The Book Of Vaadin includes a chapter on Push, including an example using Vaadin Charts . Below is my code. While based on that Vaadin Charts example mentioned above, I simplified it by replacing the use of a Chart object with a simple Label object. The Label updates every second or