Use this tag for version-specific questions about Vaadin 23 - the open-source platform for web application development. When using this tag, also include the more generic [vaadin] and [vaadin-flow] tags where applicable. Vaadin 23 superseded Vaadin 14 in March 2022.
Questions tagged [vaadin23]
191 questions
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Load MP4 via StreamResource (Vaadin 23)
I use StreamResource to upload several media types with Vaadin 23 (Vaadin doc https://vaadin.com/docs/latest/advanced/dynamic-content)
Uploading images (jpeg) and documents (pdf) works well with StreamResource but uploading videos (mp4) doesn't seem…
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1 answer
Vaadin 23 WEBSOCKET_XHR + ui.setPollInterval as a backup channel
Because of a frequent losing of websoket connection between client and server, is this a good idea to use Vaadin 23 WEBSOCKET_XHR + ui.setPollInterval() as a backup channel?
For example:
var ui =…
alexanoid
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How to display a property of selection object while hovering cursor over combo box item in Vaadin
In my Vaadin (v.23.2.6) application I am creating a bean of class Book. This bean has set of tags.
Tags are retrieved from the database and contain two properties - tagName and tagDescription.
In my UI form I specified MultiSelectComboBox for…
Gary Greenberg
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1 answer
Vaadin nested async calls and UI object
Is it safe to do nested asynchronous calls (websocket calls) with Vaadin like:
var ui1 = UI.getCurrent();
listenableFuture1.addCallback(page1 -> {
ui1.access(() -> {
//update ui here, then:
var ui2 =…
alexanoid
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1 answer
Vaadin23 client side async XHR requests to load the placeholder content
I like responsive application behavior which I may achieve with @PUSH. The downside of this approach - the issue with web-sockets which stop working for the unknown reason on my iPhone after some unpredictable period of time. The only solution…
alexanoid
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Vaadin 23 @Push(transport = Transport.WEBSOCKET_XHR) ping socket
Please correct me if I'm wrong that Transport.WEBSOCKET_XHR means that browser asks server via XmlHttpRequest (AJAX) and server responds to the browser via websocket.
So, with Transport.WEBSOCKET_XHR, is there any out-of-the-box functionality…
alexanoid
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Vaadin 23 websockets - Fallback chunk is not available, skipping fallback dependencies load
During debug of Vaadin 23 application with @Push(transport = Transport.WEBSOCKET_XHR) enabled I see many messages like the following:
2022-11-15 21:53:10.826 DEBUG 23532 --- [ task-8] c.v.flow.component.internal.UIInternals : Fallback chunk…
alexanoid
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Vaadin 23 java.io.IOException: Can not read scheme 'war' for resource jar:war:file:../ui-0.0.1.jar*/BOOT-INF/lib
In the debug I frequently see the following exception:
2022-11-15 03:05:22.692 DEBUG 1791602 --- [http-nio-8080-exec-6] com.vaadin.flow.server.StaticFileServer : failed to read jar file contents
java.io.IOException: Can not read scheme 'war' for…
alexanoid
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2 answers
Vaadin binder throw an exception on empty field
In my Vaadin (v.23.2.6) application I have a form tied up to Filter class which has 5 attributes.
All of them are optional, i.e. user can leave the blank.
public FilterPanel(ApiBookUtils api) {
this.api = api;
this.authorField = new…
Gary Greenberg
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Vaadin 23 ComboBox with Lit renderer popup window
I implemented my custom renderer for ComboBox:
StringBuilder tpl = new StringBuilder();
tpl.append("
");
tpl.append("
");
…
alexanoid
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Vaadin 23 WebSockets recovery logic
I'm still fighting with a proper configuration of WebSockets in Vaadin 23 application and NGINX.
For NGINX I configured the following:
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection…
alexanoid
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1 answer
Vaadin 23 proper usage of nested layouts
Typically, when I need to present some information, I use VerticalLayout (VL) as a main container and many of nested HorizonalLayouts (HL). I may be wrong, but I feel that this is not a very effective way to organize the information. I suppose I may…
alexanoid
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1 answer
Binding combo boxes in Vaadin Dialog and some extra fields
In my Vaadin application I have a dialog that creates a filter to search for books.
As a result I am creating a Filter bean that looks like this:
public class Filter implements Serializable {
private Author author;
private String country;
private…
Gary Greenberg
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Vaadin 23 StatelessAuthentication JWT and JSESSIONID
I have configured my Vaadin23 application with stateless authentication model and Keycloak SSO. I use JWT token with Cookie in order to restore the user session on application redeploy. At first glance everything is working fine. But, from time to…
alexanoid
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Vaadin 23 Ui.navigate from another thread
When I try to navigate a user asynchronously from the server-side via @Push like:
ListenableFuture listenableFuture = // some Async method invocation
var ui = UI.getCurrent();
listenableFuture.addCallback(jobApplicationMatrix…
alexanoid
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