fix(sam-serverless-app): upgrade Gradle wrapper to 8.5 for JDK 21 com… - #607
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…patibility The MDE Universal Image 4.0 ships JDK 21 as default, which produces class file version 65. Gradle 7.3.3's Groovy/ASM only supports up to version 61 (JDK 17), causing 'Unsupported class file major version 65' errors during postStart in Dev Environments. Gradle 8.5 is the minimum version supporting JDK 21.
dnemec-aws
approved these changes
Aug 21, 2026
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The MDE Universal Image 4.0 ships JDK 21 as default, which produces class file version 65. Gradle 7.3.3's Groovy/ASM only supports up to version 61 (JDK 17), causing 'Unsupported class file major version 65' errors during postStart in Dev Environments.
Gradle 8.5 is the minimum version supporting JDK 21.
Issue
Description
Updates the SAM blueprint's Gradle wrapper from 7.3.3 to 8.5 so that the generated Java Lambda project can build under JDK 21 (shipped in MDE Universal Image 4.0). Also updates the corresponding snapshot test.
Testing
yarn blueprint:synth— confirmed generated projects use Gradle 8.5yarn test— all 26 tests pass, 84 snapshots passyarn buildpasses (pre-push hook)Unsupported class file major version 65error fromdevfileCommand.logAdditional context
The sam-serverless-application blueprint is used by internal canary testing only. No customer impact from this change. The canary alarm has been firing continuously since Aug 14 (7