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feat: delegate no-routes handling to Copilot #23389

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feat: delegate no-routes handling to Copilot #23389

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acbdfbe
feat: delegate no-routes handling to Copilot
Artur- Jan 31, 2026
5d36bf2
format
Artur- Feb 2, 2026
974e21e
Update flow-server/src/main/java/com/vaadin/flow/router/AbstractRoute…
Artur- Feb 2, 2026
d1aba4d
Merge branch 'main' into delegate-new-view
Artur- Feb 2, 2026
76e68de
format
Artur- Feb 2, 2026
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15 changes: 14 additions & 1 deletion flow-server/src/main/java/com/vaadin/flow/router/AbstractRouteNotFoundError.java
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Original file line number Diff line number Diff line change
Expand Up @@ -78,9 +78,10 @@ public int setRouteNotFoundErrorParameter(BeforeEnterEvent event,
String template;
String routes = getRoutes(event);

boolean noRoutes = routes.isEmpty();
if (productionMode) {
template = AbstractRouteNotFoundError.LazyInit.PRODUCTION_MODE_TEMPLATE;
} else if (routes.isEmpty()) {
} else if (noRoutes) {
// Offer a way for people to get started
template = readHtmlFile("NoRoutesError_dev.html");
} else {
Expand All @@ -97,6 +98,18 @@ public int setRouteNotFoundErrorParameter(BeforeEnterEvent event,
template = template.replace("{{path}}", path);

getElement().setChild(0, new Html(template).getElement());
if (noRoutes && !productionMode) {
String copilotNoRoutes = """
(function poll() {
if (window.Vaadin?.copilot?.noRoutesInProject) {
window.Vaadin.copilot.noRoutesInProject();
} else {
setTimeout(poll, 100);
}
})();
""";
getElement().executeJs(copilotNoRoutes);
}
return HttpStatusCode.NOT_FOUND.getCode();
}

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10 changes: 3 additions & 7 deletions flow-server/src/main/resources/com/vaadin/flow/router/NoRoutesError_dev.html
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Original file line number Diff line number Diff line change
@@ -1,13 +1,9 @@
<div style="margin: 2rem;">
<h3>No views found</h3>
<p>To get started, you can either</p>
<p>To get started, you can</p>
<ul>
<li><a href onclick="window.Vaadin.copilot.initEmptyApp('flow')">Create a view for coding the UI in Java with Flow</a></li>
<li><a href onclick="window.Vaadin.copilot.initEmptyApp('hilla')">Create a view for coding the UI in TypeScript with Hilla and React</a></li>
<li>Use Vaadin Copilot to create a view</li>
<li>Create a view manually in your IDE, see <a target="_blank" href="https://vaadin.com/docs/latest/tutorial">the tutorial</a></li>
</ul>
<p>
You can also create a view manually in your IDE, see <a target="_blank" href="https://vaadin.com/docs/latest/tutorial">the tutorial</a>
</p>

<p>Learn more at <a target="_blank" href="https://vaadin.com/docs">https://vaadin.com/docs</a>.</p>
</div>
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