spring-projects / spring-projects/spring-boot

Declaring a user-defined WebServerFactory should make sure the auto-configuration backs off

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#24,706 4 comments 0 reactions 0 assignees View on GitHub

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status: on-hold type: enhancement
Dominant language
Java
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Description

See #24705

We initially designed things this way because we wanted an easy way for users to opt-in for the embedded server of their choices if they happen to have two on the classpath and the one the auto-configuration picked was not the one they wanted to use.

This corner case makes the auto-configuration at odds with others. If you register a WebServerFactory the customizers are applied anyway. This means also that whatever you configure in the factory itself is likely to be lost since default opinions are going to be applied after that.

Changing this behaviour is a breaking change that could surprise more than one user. We may want to keep the current behaviour , perhaps using a configuration property. This would help users to migrate.

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Research direction

No files or tests are named. Start by tracing WebServerFactory auto-configuration and where customizers are applied; compare that behavior with the requested back-off rule and the compatibility concern. Done should be a decided behavior, including whether a configuration property is needed to preserve the current behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
java, spring-boot
Domain
backend
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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