[runningcode]

📜 Description

• Add gradle/gradle-daemon-jvm.properties with toolchainVersion=21. Gradle then starts the daemon on an installed JDK 21, whatever JAVA_HOME points to.
• Remove the JDK version check from build.gradle.kts, and update CONTRIBUTING.md to match.
• Replace -XX:+CrashOnOutOfMemoryError with -XX:+HeapDumpOnOutOfMemoryError in the daemon JVM args. A daemon that runs out of memory now writes a heap dump to analyze instead of crashing.
• Set org.gradle.welcome=never to skip Gradle's welcome message.
• Set android.disableAgpUpgradePrompt=true to stop Android Studio prompting to upgrade AGP.

💡 Motivation and Context

Since #6242 the build requires JDK 21. If JAVA_HOME points to an older JDK, it fails with "This build requires JDK 21 or newer". With the daemon JVM pinned, ./gradlew works without switching JAVA_HOME first.

toolchainVersion=21 only accepts JDK 21, not newer ones, so the check in build.gradle.kts can no longer fail. CONTRIBUTING.md said a newer JDK runs the build, which is no longer true.

Without a JDK 21 installed, Gradle now fails before configuring the build with "Unable to download toolchain matching the requirements ({languageVersion=21, ...})". This isn't a new requirement: compilation already uses a JDK 21 toolchain, and the build doesn't configure any toolchain downloads.

💚 How did you test it?

Ran ./gradlew spotlessApply apiDump with JAVA_HOME set to JDK 17. The daemon started on JDK 21 and the build passed.

In throwaway projects:

• A file asking for JDK 17 failed even though JDK 21 and 25 were installed, so the version has to match exactly.
• With an empty Gradle home and only JDK 17 visible, a file asking for JDK 21 failed with the error above.

📝 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.

🔮 Next steps

None.

#skip-changelog

🤖 Generated with Claude Code

[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.61.1 (1)	release

⚙️ sentry-android Build Distribution Settings

[romtsn]

Set org.gradle.welcome=never to skip Gradle's welcome message.

but I want to be welcomed by Gradle, Nelson 😿