Minecraft
Server will not start: reading the console
The four errors behind almost every failed boot, and what each one means.
4 min read
The console always says what went wrong. Scroll to the first red line, not the last — the later ones are usually consequences of the first.
- "You need to agree to the EULA" — open eula.txt and set eula=true, then start again.
- "Unsupported class file major version" — the jar wants a newer Java than the one selected. Change the Java version in the Startup tab.
- "java.lang.OutOfMemoryError" — the pack or plugin set needs more memory than the plan has. Upgrade, or cut mods.
- "Failed to bind to port" — the previous process is still shutting down. Wait ten seconds and start again.
- "Missing dependency" or a plugin listed as failed — the named plugin needs another one installed first.
If the first red line is not on this list, copy it into a ticket. A single line of console tells us more than a paragraph of description.