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Route not found after recompiling and reloading a page

See original GitHub issue

Sometimes, recompiling and reloading a page causes NotFoundException and leads to the available routes page. It doesn’t happen all the time. It’s likely to happen when the CPU is busy. I can reproduce it with a plain servlet app with the Maven Jetty plugin.

Vaadin version: 14.1.18 OS: macOS Catalina 10.15.3 Browser: Chrome 80 IDE: IntelliJ IDEA Ultimate 2019.2

Issue Analytics

State:
Created 4 years ago
Comments:5 (4 by maintainers)

Top GitHub Comments

1reaction

jojulecommented, Jul 16, 2020

This is a timing issue: When you do not have fast enough computer, this keeps occurring regularly.

For example, on my 4-core 3.3GhZ i5 iMac with 16GB memory and 4TB SSD, route is lost every time one makes a code change to a view. Thus Spring DevTools and reload is completely broken on anything but the latest computers. If you take 2020 MacBook Pro with 8 core i9, reload works reliably; except if you happen to be streaming video at the same time.

My environment where bug can be reproduced reliably:

MacOS 10.15.5 (19F101)
iMac (Retina 5K, 27-inch, Mid 2015), 3.3 GHz Quad-Core Intel Core i5, 16 GB 1600 MHz DDR3
OpenJDK Runtime Environment (build 14.0.1+14)
Node v14.5.0
Apache Maven 3.6.3
Chrome 83.0.4103.116 (Official Build) (64-bit)
Vaadin 14.3.0
IntelliJ 2020.1.3 CE

To reproduce

Download default app starter from https://vaadin.com/start/v14 (Spring Boot)
Unzip
idea pom.xml
Run by double-clicking Maven > My Starter Project > Plugins > spring-boot > spring-boot:run
Open localhost:8080 in Chrome and see that app runs correctly and shows that live reload is available with Spring Boot Devtools and is enabled
In MainView.java, add add(new Button("Foo")); to end of MainView method.
Click Build Project
Browser incorrectly updates to shows “You are offline” page for “Vaadin Application”
Reload page
White page with error: Could not navigate to ‘’, Eeason: Couldn’t find route for ‘’, Available routes:

This is a known bug in Spring Devtools: https://github.com/spring-projects/spring-boot/issues/19543

Proposed fix: In the “Could not navigate to” view, explain the issue and link to documentation that explains how to work around this by using other available options for reload until underlaying Spring Devtools issue is fixed

0reactions

joherikscommented, Aug 26, 2020

Tailored Spring add-on’s “route-not-found” page to show an explanatory message as suggested in https://github.com/vaadin/flow/issues/7822#issuecomment-659712226.

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