build: Add Java 8 API compatibility checks

[adinauer]

📜 Description

Add Java 8 runtime API compatibility coverage to JVM SDK modules using Animal Sniffer and the Codehaus Java 8 signature.

This applies ru.vyarus.animalsniffer to Java 8 java-library SDK modules that were missing it and adds:

org.codehaus.mojo.signature:java18:1.0@signature

to those modules, with the signature version defined in gradle/libs.versions.toml as java18Signature. Modules that already used Animal Sniffer keep their existing gummy-bears signature and also get the Codehaus Java 8 signature. The plugin checks signatures independently, so the Java 8 check still catches plain JVM incompatibilities while the existing Android/desugaring coverage remains intact.

💡 Motivation and Context

We recently hit a Java 8 runtime incompatibility from a method reference that compiled on a newer JDK but is unavailable on Java 8. Targeting Java 8 bytecode is not sufficient to catch this class of issue, so published JVM SDK modules should also be checked against the Java 8 runtime API surface.

This now runs through the existing check lifecycle and therefore through the existing Build workflow on PRs and main.

Refs GH-5741

💚 How did you test it?

./gradlew spotlessApply apiDump
BUILD SUCCESSFUL

./gradlew check --no-configuration-cache -Dorg.gradle.configureondemand=false
BUILD SUCCESSFUL

The check run includes Android modules and passed, confirming the duplicated JVM Animal Sniffer configuration does not break Android builds.

A stacked validation PR intentionally introduces newer JDK API references in multiple JVM modules to confirm the new checks fail where expected.

📝 Checklist

• I added GH Issue ID & Linear ID
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.
• Public API changes reviewed by another Mobile SDK team member or implemented according to the develop docs spec.

#skip-changelog

[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.48.0 (1)	release

⚙️ sentry-android Build Distribution Settings

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	315.04 ms	360.96 ms	45.92 ms
Size	0 B	0 B	0 B

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
4c04bb8	350.71 ms	413.63 ms	62.92 ms
bb0ff41	315.84 ms	350.76 ms	34.92 ms
7c1a728	289.46 ms	368.15 ms	78.69 ms
ff8eea4	313.42 ms	337.08 ms	23.66 ms
bbc35bb	298.53 ms	372.17 ms	73.64 ms
91bb874	311.00 ms	363.47 ms	52.47 ms
abfcc92	337.38 ms	427.39 ms	90.00 ms
ae7fed0	293.84 ms	380.22 ms	86.38 ms
3998a95	415.94 ms	478.54 ms	62.60 ms
d15471f	307.28 ms	381.85 ms	74.57 ms

App size

Revision	Plain	With Sentry	Diff
4c04bb8	0 B	0 B	0 B
bb0ff41	0 B	0 B	0 B
7c1a728	0 B	0 B	0 B
ff8eea4	1.58 MiB	2.28 MiB	718.64 KiB
bbc35bb	1.58 MiB	2.12 MiB	553.01 KiB
91bb874	1.58 MiB	2.13 MiB	559.07 KiB
abfcc92	1.58 MiB	2.13 MiB	557.31 KiB
ae7fed0	1.58 MiB	2.12 MiB	551.77 KiB
3998a95	1.58 MiB	2.10 MiB	532.96 KiB
d15471f	1.58 MiB	2.13 MiB	559.54 KiB

Previous results on branch: ci/java8-api-compatibility

Startup times

Revision	Plain	With Sentry	Diff
29117d4	315.09 ms	353.43 ms	38.34 ms
e122d12	360.71 ms	433.96 ms	73.25 ms

App size

Revision	Plain	With Sentry	Diff
29117d4	0 B	0 B	0 B
e122d12	0 B	0 B	0 B

[adinauer]

Tested this using #5746 and it failed for both Math.floorDiv and Objects.requireNonNullElse in different modules.

[runningcode]

why not use the version catalog for the dependency as well (instead of just the version) ?

[runningcode]

Check the build scan to make sure this doesn't eagerly resolve the task.

This would definitely not eagerly resolve the task:

Suggested change

	tasks { check { dependsOn(animalsnifferMain) } }
	tasks.check.configureEach { dependsOn(animalsnifferMain) }