fbjni 16 KB page-size fix: upgrade to 0.7.0

Artifact com.facebook.fbjni:fbjni · measured 2026-10-01 · all libraries

fixed

fbjni versions up to and including 0.6.0 that we measured ship 4 KB-aligned native libraries (offending for Google Play's 16 KB page-size requirement). The first measured aligned stable version is 0.7.0; the newest measured, 0.8.1, is aligned.

Caveats

Sampled, not exhaustive: 13 of 13 published versions were measured with native code; unmeasured versions in between are unknown.

Measured evidence

	Version	Library file	p_align	File date	Source
Last offending	`0.6.0`	`jni/arm64-v8a/libc++_shared.so`	4 KB (2^12)	Mon, 29 Jan 2024 09:41:26 GMT	artifact
First aligned	`0.7.0`	`jni/arm64-v8a/libc++_shared.so`	16 KB (2^14)	Tue, 24 Sep 2024 10:29:19 GMT	artifact

p_align is the smallest PT_LOAD segment alignment of the ELF. 16 KB-compatible needs at least 16384 (2^14). Method: min PT_LOAD p_align of arm64-v8a/x86_64 .so inside the published AAR/JAR; aligned = >=16384 for every lib. Dates are repository file times, not official release dates.

Offending versions measured (10)

0.0.2, 0.0.4, 0.1.0, 0.2.0, 0.2.2, 0.3.0, 0.4.0, 0.5.0, 0.5.1, 0.6.0

Native libraries seen: libc++_shared.so, libfbjni.so.

The Gradle change

implementation("com.facebook.fbjni:fbjni:0.7.0")

an aligned version, lowest measured above the last offending one; newer measured versions are aligned too (latest 0.8.1). Check: ./gradlew :app:dependencyInsight --dependency fbjni --configuration releaseRuntimeClasspath

Confirm what Gradle actually resolves, since another dependency may pull an older version:

./gradlew :app:dependencyInsight --dependency fbjni --configuration releaseRuntimeClasspath

Re-verify it yourself

Download the artifact and run the free checker (check16k.py, Python 3, no dependencies):

curl -LO https://repo1.maven.org/maven2/com/facebook/fbjni/fbjni/0.7.0/fbjni-0.7.0.aar
python3 check16k.py fbjni-0.7.0.aar

Exit 0 = aligned, 1 = an unaligned library found. Better still, run it on your final .aab/.apk.

Need the full map for every library, not just fbjni?

The paid kit ($12, v2) contains the complete measured fix map for all 80+ libraries as JSON and a table, every raw per-version measurement, the spot-check evidence, and the step-by-step guide for Play's 16 KB requirement. This page and the checker script stay free.

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