How to Fix a The NotJen Pack Server That Keeps Crashing
The NotJen Pack sticks close to vanilla Minecraft by design on Forge 1.19.2, layering in extra bosses and harder mobs for a tougher but familiar survival experience. That smaller mod footprint is actually good news for troubleshooting — with far fewer mods to conflict with each other, server crashes here tend to trace back to more basic causes like the wrong Java version or an undersized RAM allocation rather than a tangled mod interaction.
See the The NotJen Pack pack page for the full RAM and setup breakdown before you chase anything else.
1. Running the wrong Java version
Forge for Minecraft 1.19.2 requires Java 17. If your host or launcher is still pointed at an older Java runtime (left over from an older pack, or a default that was never updated), the server can fail to boot cleanly or crash almost immediately after startup. This is worth ruling out first precisely because it's so easy to overlook on a pack that otherwise feels simple to run.
- Confirm the server is launching with Java 17, not Java 8 or Java 11
- Check your host's runtime/version setting if you manage multiple packs on different Minecraft versions
2. RAM allocation below the real floor
Because The NotJen Pack is lighter on mods than a typical modpack, it's tempting to under-allocate RAM assuming it needs vanilla-like resources. In practice the added bosses, tougher mobs, and the general Forge 1.19.2 overhead push the realistic floor higher than a bare vanilla server would need. Running below that floor is one of the more common root causes of instability here, even though the pack looks lightweight on paper.
3. Mob AI load during multi-mob or boss fights
The harder, buffed versions of vanilla mobs and the pack's extra bosses carry a modest AI-cost increase over their vanilla counterparts. That cost is usually negligible in normal play, but it can compound when several buffed mobs or a boss fight pile up at once, adding to tick time. This is rarely a crash cause by itself, but it's a meaningful contributor when it lands on top of a server that's already short on headroom.
4. Fewer mods means fewer places for a conflict to hide — check the basics first
With a smaller mod list than a typical kitchen-sink pack, complex cross-mod conflicts are less likely to be your issue here. Before assuming a deep mod interaction, it's worth double-checking the simpler, more common culprits: the Java version, the server.properties and Forge startup flags, and whether any world corruption crept in from a prior crash. On a close-to-vanilla pack like this, the mundane explanation is usually the right one.
5. RAM under the pack's realistic floor
The real floor for The NotJen Pack is 6 GB. Running under that doesn't usually produce a single clean crash message — it tends to show up first as cascading lag and longer garbage-collection pauses as the heap fills up, especially during the multi-mob or boss fights mentioned above, and only escalates into an actual tick timeout or crash once the server can't recover between GC cycles. If you're seeing gradual slowdown before a crash rather than an instant one, undersized RAM is a strong candidate.
FAQ
Why does The NotJen Pack crash more often than I'd expect for a close-to-vanilla pack?+
Because it's close to vanilla, it has far fewer mods than a typical kitchen-sink pack, which means the usual mod-interaction crashes are much less likely. In practice that shifts the odds toward more mundane causes — the wrong Java version or an undersized RAM allocation are disproportionately likely to be the actual culprit here, simply because there's less else that can go wrong.
Do I need a specific Java version for The NotJen Pack?+
Yes. The NotJen Pack runs on Forge for Minecraft 1.19.2, and Forge 1.19.2 requires Java 17. Running it on Java 8 or Java 11 will typically fail to start or crash shortly after, so it's one of the first things worth checking before digging into logs.
Can the harder mobs or extra bosses actually crash the server on their own?+
On their own, unlikely. The buffed vanilla mobs and added bosses carry a modest AI-cost increase over their vanilla equivalents, and that cost can compound during multi-mob fights or boss encounters, contributing to lag spikes. But it's rarely the sole cause of a full crash — it's more often a contributing factor on top of an already-tight RAM allocation or a struggling CPU.
Host The NotJen Pack on hardware sized for its real floor
Give The NotJen Pack the 6 GB RAM floor it actually needs, and take a backup before any Java, flag, or mod change so a bad tweak never costs you the world.
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