[Bug] Visit sensitivity preview not working

[TheRed-MM]

Describe the bug
Since v4.0.3 the preview in Settings > Visit sensitivity is not working anymore.

To Reproduce
Steps to reproduce the behavior:

1. Go to Settings > Visit sensitivity
2. Click "Edit" on an existing configuration
3. Click "Preview"
4. Nothing happens

Expected behavior
Up until v4.0.2 the preview worked just fine showcasing the results of changing the sensitivity settings. Same behavior is expected ion v4.0.3

Additional context
It throws a whole bunch of errors:

2026-04-20T19:43:55.756Z  INFO 1 --- [pool-3-thread-2] c.d.r.service.MessageDispatcherService   : Dispatching TriggerProcessingEvent TriggerProcessingEvent{username='XXXXX', previewId='beadf8e9-57bd-4210-b912-6f4b8f23d43f', receivedAt=2026-04-20T19:43:55.753565134Z, traceId='94bab993-2fe1-40ba-85ef-b014e1167f1c'}

2026-04-20T19:43:55.763Z ERROR 1 --- [nio-8080-exec-8] org.thymeleaf.TemplateEngine             : [THYMELEAF][http-nio-8080-exec-8] Exception processing template "fragments/configuration-preview::[configuration-preview]": Exception evaluating SpringEL expression: "previewConfig.visitMerging.minDistanceBetweenVisits" (template: "fragments/configuration-preview" - line 72, col 26)

org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "previewConfig.visitMerging.minDistanceBetweenVisits" (template: "fragments/configuration-preview" - line 72, col 26)

2026-04-20T19:43:55.766Z ERROR 1 --- [nio-8080-exec-8] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "previewConfig.visitMerging.minDistanceBetweenVisits" (template: "fragments/configuration-preview" - line 72, col 26)] with root cause

org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'minDistanceBetweenVisits' cannot be found on object of type 'com.dedicatedcode.reitti.model.processing.DetectionParameter$VisitMerging' - maybe not public or not valid?

2026-04-20T19:43:55.772Z ERROR 1 --- [nio-8080-exec-8] c.d.r.controller.CustomErrorController   : Error 500 occurred for request URI: /settings/visit-sensitivity/preview, message:

jakarta.servlet.ServletException: Request processing failed: org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "previewConfig.visitMerging.minDistanceBetweenVisits" (template: "fragments/configuration-preview" - line 72, col 26)

2026-04-20T19:43:56.605Z  INFO 1 --- [pool-4-thread-1] d.r.s.p.UnifiedLocationProcessingService : Processing location data for user [XXXXX], mode: PREVIEW
04/20/2026, 09:43:56 PM
STDOUT
2026-04-20T19:43:56.873Z  INFO 1 --- [pool-4-thread-1] d.r.s.p.UnifiedLocationProcessingService : Processing location data for user [XXXXX], mode: PREVIEW

[dgraf-gh]

Ok, i understand the error and it should be easy to fix. The question is, there were no changes on that part in the last release. Looks like it is taking a old version of the template.

I will fix it tomorrow morning.

[dgraf-gh]

The code on that part did not change since the 4.0 release and is broken since then. I think what is causing the first issue is that when the config matches a standard one, it does not fill in the form and therefore do not break.

But there are other issues, creating the preview timeline did not work either because it could not update the previewProcessedVisits.

As soon as the merge is done, I will issue a new release for this.

[TheRed-MM]

Ok, great 👍🏼
Come to think of it, it might be I was still on version 3.x when I used this feature the last time. Been playing around with Reitti quite a bit in the last few days and might have mixed up the timings when I upgraded.
That would then be in line with what you wrote about v4.0.

[dgraf-gh]

Ok, that make sense. Then lets pretend it was on the v3x. :)

[TheRed-MM]

Hi,
just pulled the latest image and confirm it's working again. Great work, thanks so much ;)
Cheers!