How to Fix a Create and Guns Server That Keeps Crashing
Create and Guns pairs Create's kinetic automation with a firearms system where weapons are built through Create machine chains instead of a crafting table. That combination means a crash can come from two very different directions at once — a contraption straining the tick loop, or a firefight straining entity tracking — and the fix looks different depending on which one it is. Here's how to tell them apart.
See the Create and Guns pack page for the full RAM and setup breakdown before you chase anything else.
1. Wrong Java version on boot
NeoForge on Minecraft 1.21.1 requires Java 21. If this is a fresh box, that's usually fine — but if it previously hosted an older pack on 1.12.2, 1.16.5, or even 1.18.x, there's a good chance Java 8 or Java 17 is still the default on PATH. A boot failure that happens immediately, before any world or mod loading output appears, with no mod name attached to the error, points here first.
- Confirm the server is launching with Java 21, not an older install left over from a previous pack
- A clean, early boot failure with no mod-specific stack trace is the signature to look for
2. Create contraption tick lag at scale
Create-centered packs share a well-known pattern: large contraptions — long belt lines, big mixer/press setups, train networks — add real per-tick processing cost that grows with the size of the machine, independent of how many players are online. This isn't a bug in the usual sense, it's the cost of simulating that much moving machinery every tick.
If TPS drops line up with someone finishing a big build rather than with player count going up, that's a strong signal this is the cause, not a coincidence.
3. Firearm combat entity and projectile tracking
The firearms layer in this pack tracks its own entities and projectiles, and that adds real tick cost during active combat — raids, PvP, or fighting off mobs with guns rather than melee. This mirrors what shows up in other combat-mod-heavy packs: the lag or freeze clusters around firefights specifically, not around building or exploring.
If your crash timing lines up with combat rather than Create activity, treat it as a separate problem from contraption lag, even though both can be happening on the same server.
4. Contraptions caught mid-motion on an unclean stop
A pattern that's come up across Create-based packs is a contraption — something assembling, moving, or disassembling — getting interrupted by a server stop or crash at exactly the wrong moment. On reload, that half-finished state can cause errors tied to that specific chunk rather than the whole server. If crashes repeat at the same location every time rather than being random, a contraption stuck mid-motion near that spot is worth checking before anything else.
5. RAM under the pack's realistic floor
6 GB is the real floor for Create and Guns. Running it on less doesn't usually produce a clean, instant crash — it shows up first as creeping lag and garbage-collection pauses that get worse as Create machinery and firearm entities pile up, and only turns into an actual crash once a tick takes long enough to trip a watchdog timeout. If your lag has been building gradually rather than appearing suddenly, under-provisioned RAM is worth ruling out before blaming any specific mod.
FAQ
My Create and Guns server fails to boot right after I set it up — what's the first thing to check?+
Check the Java version the server process is actually running on. NeoForge 1.21.1 requires Java 21, and if this box previously ran an older 1.12.2 or 1.16.5 pack, it's common for Java 8 or 17 to still be the default on PATH. A boot failure that happens before the world even loads, with no mod-specific error, is almost always this.
The server runs fine solo but lags or crashes once a few people start building with Create — why?+
Large Create contraptions (mixers, presses, long belt lines, train tracks) add real per-tick cost that scales with the size of the machine, not the player count. This is a well-documented pattern across every Create-centered pack, not unique to this one. Watch TPS as builds grow, and treat a sudden drop after someone finishes a big contraption as a strong signal, not a coincidence.
Does PvP or mob combat make crashes worse in Create and Guns specifically?+
Yes — this pack layers a firearms system with its own projectile and entity tracking on top of Create's machinery, and combat-heavy moments (raids, PvP, horde fights) add real tick cost similar to other combat-mod-heavy packs. If crashes or freezes cluster around firefights rather than building activity, that's the mod category to look at first, separate from any Create-related lag.
How much RAM does a Create and Guns server actually need?+
6 GB is the real floor for this pack. The combination of Create's machine processing and the firearms mod's entity tracking means it sits heavier than a plain vanilla-plus pack at the same player count, and under-provisioning tends to show up as creeping lag and GC pauses well before a hard crash.
Host Create and Guns on hardware sized for its real floor
Create and Guns needs a genuine 6 GB floor to keep Create's machinery and the firearms system running smoothly — pair that with a backup before any big contraption rebuild or mod update so a bad change never costs you the world.
View Minecraft Hosting →