Request Guidance on Build Issues in my feature branch

[YoungHoney]

Hello ~

I'm currently working on #6313 to implementing Jackson polymorphism support for DocService as requested in the community.

The good news is that the core feature implementation is complete and works as expected. I have verified with a local example service that the feature correctly generates a JSON specification with oneOf and discriminator fields.

The Problem: Build Instability

However, this feature has uncovered significant and complex build stability issues when running a full parallel build (./gradlew clean build --parallel). While a build on the main branch succeeds, my feature branch consistently fails, with the failure points being non-deterministic.

Summary of Investigation

To demonstrate the instability, I ran the full clean build --parallel process three times on my feature branch. Here are the results:

Run #	Full Build Result	Failing Task(s) & Error Type	Individual Re-run Result
1	Failed	:kubernetes:shadedTest :grpc:shadedTest (AssertionError)	Succeeded
2	Failed	:xds:shadedTest (TimeoutException)	Succeeded
3	Failed	:spring:boot2-webflux-autoconfigure:shadedTest :spring:boot3-webflux-autoconfigure:shadedTest (JVM did not terminate cleanly)	Failed

As the data shows, the build fails at different points with different errors. Most failures appear to be flaky tests that pass when run in isolation (Run 1 & 2). However, some failures are more persistent and suggest a severe resource leak, failing even on an individual re-run (Run 3).

My Environment:

• OS: Linux 6.8.0-78-generic amd64
• JDK: OpenJDK 21.0.8 (Ubuntu 21.0.8+9-Ubuntu-0ubuntu124.04.1)
• Gradle: 8.10.2

Request for Guidance

I have a working feature, but I cannot proceed because of these complex build failures that are triggered by my changes. I am looking for guidance on how to resolve this.

What would be the recommended next step to get this feature merged without compromising the project's build stability?

I'm happy to provide more detailed logs and thread dumps upon request. Thank you.

[minwoox]

:spring:boot2-webflux-autoconfigure:shadedTest
:spring:boot3-webflux-autoconfigure:shadedTest
(JVM did not terminate cleanly)

This will be fixed by this PR:
#6379

[YoungHoney]

Thank you !

[YoungHoney]

I've done some local testing by merging your PR #6379 into my feature branch to verify the fix, and I have some interesting findings to share.

For context, my local environment is running on an Intel Core Ultra 7 155H CPU (16 cores, 22 logical threads).

Here is a summary of my build attempts after merging your fix:

Build Command	Result	Observations
./gradlew clean build --parallel	🔴 FAILED	worked perfectly for the JVM did not terminate cleanly error, as it no longer occurs. However, the build still fails with the other errors like :kubernetes, :grpc, and :xds.
./gradlew clean build --parallel --max-workers=6	🟢 SUCCESSFUL	By explicitly limiting the number of parallel workers to 6, the build now completes successfully and consistently.

Sharing this in case it helps with the investigation. Thank you again!

[minwoox]

Thanks for checking it. 👍
Will take a look at the other failures later since they are not critical.
Feel free to investigate them if you’d like. 😉