file-routes.json cannot be found

[mshabarov]

Describe the bug

Each Vaadin 24.4 application, that contains Hilla, shows this exception on startup, complaining about file-routes.json file not found:

java.io.FileNotFoundException: .../skeleton-starter-flow-spring/./src/main/frontend/generated/file-routes.json (No such file or directory)
	at java.base/java.io.FileInputStream.open0(Native Method) ~[na:na]
	at java.base/java.io.FileInputStream.open(FileInputStream.java:216) ~[na:na]
	at java.base/java.io.FileInputStream.<init>(FileInputStream.java:157) ~[na:na]
	at java.base/java.io.FileInputStream.<init>(FileInputStream.java:111) ~[na:na]
	at java.base/sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:86) ~[na:na]
	at java.base/sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:189) ~[na:na]
	at java.base/java.net.URL.openStream(URL.java:1161) ~[na:na]
	at com.vaadin.hilla.route.ClientRouteRegistry.registerClientRoutes(ClientRouteRegistry.java:158) ~[hilla-endpoint-24.4-20240506.022159-195.jar:na]
	at com.vaadin.hilla.startup.RouteUnifyingServiceInitListener.serviceInit(RouteUnifyingServiceInitListener.java:101) ~[hilla-endpoint-24.4-20240506.022159-195.jar:na]

This, however, doesn't affect the application behaviour and most likely an intermediate state during the build, when this file isn't created yet.

Related-to #2358 (comment), as a possible way to fix it, this exception can be ignored in the ClientRouteRegistry.

Expected-behavior

No exception

Reproduction

Any Hilla or Flow+Spring-Boot starter for Vaadin 24.4.

System Info

Vaadin 24.4.0.beta2

[ZheSun88]

this actually affects my application with the following steps.

download the app using this preset https://start.vaadin.com/dl?&preset=test-hybrid-react&projectName=test-hybrid-react&preset=partial-prerelease
unzip
./mvnw
navigate to localhost:8080 [1]
click Hello Hilla
click Hello Flow [2]

in the build log, i have the same exception as mentioned in the original post

• [1]
  

• [2]
  the url goes to about:blank#blocked and leave a blank screen
  

[taefi]

@ZheSun88 I haven't looked into this yet, but that error log is only happening when a clean app (mostly when a newly created one) is started as the result of an eager attempt for initializing the ClientRouteRegistry and that error log should be just silently ignored as it is expected not to have the file-routes.json in that phase for a new/clean app.
I'd say it has nothing to do with what you've described above, and it's a separate issue (highly probably a blocker) that should be resolved.

[ZheSun88]

I can create a separate issue if necessary..

[Artur-]

Create a new issue, we need to fix this first to avoid that everybody associates all new issues with this stack trace when no other stack trace is shown

[mcollovati]

I think it is related to the fact that the Flow view has a route template parameters

@Route(value = "/:samplePersonID?/:action?(edit)")
@RouteAlias(value = "")
@Uses(Icon.class)
public class HelloFlowView extends Div implements BeforeEnterObserver {

If you replace the @Route(value = "/:samplePersonID?/:action?(edit)") part with @Route("") (also removing the alias) the menu link seems to work,

[ZheSun88]

@mcollovati then it seems the problem comes from the app itself than flow/hilla?

if so, we need to fix that in start project on how to generate this project.

[mcollovati]

I'm not sure. The /:samplePersonID?/:action?(edit) is a valid route in a Flow application, but I don't know if it is supported in the autogenerated menu.

[ZheSun88]

aww.. okay.. anyway.. i will make this to another ticket.. :-)

[vaadin-bot]

This ticket/PR has been released with Hilla 24.4.0.beta3 and is also targeting the upcoming stable 24.4.0 version.

[vaadin-bot]

This ticket/PR has been released with Hilla 24.5.0.alpha1 and is also targeting the upcoming stable 24.5.0 version.