1.17 Pre-release 1 - server.jar JNI error

Hi Ricardo, this means that your version of Java is not up to date. I use CubedHost for my multiplayer world and once I set my Java version to 16 everything worked fine.

For reference, see the patch notes for 21w19a (https://www.minecraft.net/en-us/article/minecraft-snapshot-21w19a), which increased the minimum Java version to 16.

Thank you for your report!
We're tracking this issue in MC-225505, so this ticket is being resolved and linked as a duplicate.

If you would like to add a vote and any extra information to the main ticket it would be appreciated.

If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
_{-- I am a bot. This action was performed automatically! If you think it was incorrect, please notify us on Discord or Reddit}