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The new netty LeakPresenceDetector allows for leak detection that is more lightweight, faster, and more reliable. Add a micronaut-test module that enables leak detection through a jupiter and a spock extension.
yawkat
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Oct 17, 2025
Netty 4.2.7 introduced a new leak detection mechanism for tests that is more reliable and has lower overhead. micronaut-projects/micronaut-test#1291 introduces a micronaut-test module that uses this new mechanism. However, the new detector is more strict about resource lifetimes, so tests need various small adjustments: - Contexts must be closed at the end of the test - Event loops must be shut down - Tests must use only threads created in those tests (no Finalizers, no reactive boundedElastic) - SSL contexts must be released immediately There is also one minor leak fix in this PR, related to h2c support, in Http2ServerHandler. Draft because this requires the new micronaut-test module.
graemerocher
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Oct 17, 2025
sdelamo
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Oct 17, 2025
melix
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Oct 17, 2025
melix
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Oct 17, 2025
sdelamo
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The remaining CI failures look unrelated, I think this can be safely merged @sdelamo |
Btw, I am seeing this error all over when test-resources are used in 4.x branches. Seem to work fine in branches for Micronaut 5.x |
yawkat
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Dec 15, 2025
* New leak detection for tests Netty 4.2.7 introduced a new leak detection mechanism for tests that is more reliable and has lower overhead. micronaut-projects/micronaut-test#1291 introduces a micronaut-test module that uses this new mechanism. However, the new detector is more strict about resource lifetimes, so tests need various small adjustments: - Contexts must be closed at the end of the test - Event loops must be shut down - Tests must use only threads created in those tests (no Finalizers, no reactive boundedElastic) - SSL contexts must be released immediately There is also one minor leak fix in this PR, related to h2c support, in Http2ServerHandler. Draft because this requires the new micronaut-test module. * move to micronaut-test module * fix test * Update gradle/libs.versions.toml Co-authored-by: Sergio del Amo <sergio.delamo@softamo.com> * enable trackCreationStack * disable trackCreationStack --------- Co-authored-by: Sergio del Amo <sergio.delamo@softamo.com>
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The new netty LeakPresenceDetector allows for leak detection that is more lightweight, faster, and more reliable. Add a micronaut-test module that enables leak detection through a jupiter and a spock extension.