I'm not on the Crowd team but I will try to help.
According to the support platforms page OpenJDK 1.8 is the currently supported version in 3.3.x https://confluence.atlassian.com/crowd/supported-platforms-191851.html
If having support in Crowd for another JDK version is important to you, I'd recommend creating an issue in our public issue tracker for Crowd: https://jira.atlassian.com/projects/CWD/issues
I hope that helps!
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