This issue was fixed in a recent version of AMPS:
https://developer.atlassian.com/server/framework/atlassian-sdk/amps-8-6-0/
Enhancement / Features:
- AMPS-1608 - Automatically download H2 JAR for Confluence
See previous threads here:
- Atlas-run-standalone --product confluence --version 8.1.1 won't start
- Preparing for Confluence 8.0 - EAP coming soon - #30 by jens
Also note that these recent versions of AMPS require a more recent version of Maven than is installed with the SDK by default. See: AMPS 8.3.1 build failure - #2 by ccurti