Java Version Compatibility Tool
Check the Java version needed for common Minecraft server version ranges and avoid UnsupportedClassVersionError plugin and server startup failures.
Check Java Compatibility
Use this tool when updating Minecraft, Java, or plugins. It gives a baseline runtime check and reminds you to verify the exact server jar and plugin requirements.
If startup already fails, paste the error into the console error explainer. For startup commands, use the JVM flag generator.
Practical Rule
Keep Java updates deliberate. Update Java, restart, check logs, then update server and plugins in a controlled order.
FAQ
What error means Java is too old?
UnsupportedClassVersionError or class file version messages usually mean the jar was compiled for a newer Java version.
Can plugins require newer Java than the server?
Yes. A plugin can be compiled for a newer Java runtime than your server currently uses.
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