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https://issues.apache.org/jira/browse/TAP5-2776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17849676#comment-17849676
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Roman Trapickin commented on TAP5-2776:
---------------------------------------
We created a minimal reproducible example to help fix the issue:
[^tap5-2776.zip]
Launch the main-method in
{{src/main/java/org/example/app/SpringBootTapestryApp.java}}
* In dev mode everything works fine
* In prod mode there is an NPE
> Make page preloading optional in production mode
> ------------------------------------------------
>
> Key: TAP5-2776
> URL: https://issues.apache.org/jira/browse/TAP5-2776
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.8.5, 5.8.6
> Reporter: Roman Trapickin
> Priority: Major
> Attachments: tap5-2776.zip
>
>
> We use Tapestry 5.8.4 and Spring Boot 2.7 in production. To make things work,
> Tapestry context is initialized by the Spring context, not vice versa as done
> by {{tapestry-spring}}. This a tricky situation since Tapestry needs Spring
> beans and Spring beans sometimes need Tapestry beans.
> To solve this problem we exploit Spring's BeanFactoryPostProcessor in order
> to initialize Tapestry context before Spring beans are evaluated:
> # Start initializing Spring context
> # "Pause" within BeanFactoryPostProcessor and initialize Tapestry context.
> Tapestry beans do not need fully initialized Spring beans yet.
> # Finish Spring context initialization.
> # Tapestry beans and pages can now inject fully initialized Spring beans.
> I'll provide some code snippets in the comments below.
> TAP5-2772 has changed the preloading behavior in production mode so that
> Tapestry now eagerly resolves the Spring beans, thus relying on a fully
> initialized Spring context. Since Spring context init is not finished yet, a
> good amount of unresolved bean/property exceptions is thrown. Now we cannot
> break this vicious cycle of both contexts having a need for each other. This
> problem is not present in development mode.
> I file this issue as a bug since we need the old behavior to be restored in
> production mode. Alternatively we could introduce a setting for production
> mode to disable the new preloading feature.
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