How to Fix a Star Technology Server That Keeps Crashing
Star Technology is one of the first GregTech CEu Modern skyblock packs built on Forge 1.20.1, bringing GregTech's demanding multiblock ore-processing progression into a skyblock format on the current Forge ecosystem. That combination — skyblock's constrained starting world plus GregTech's heavy machine simulation — means most crashes trace back to a small set of well-known causes rather than a mystery bug.
See the Star Technology pack page for the full RAM and setup breakdown before you chase anything else.
1. Java version mismatch on boot
Forge 1.20.1 requires Java 17. If your server (or a host that auto-selects an older runtime) is launching with Java 8 or 11, the server will fail to start or crash within the first few seconds — this is the first thing to rule out whenever the server won't boot at all, not just when it's crashing mid-session.
- Confirm the server is actually launching under Java 17, not an older default
- A boot failure in the first few seconds points here before anything mod-related
2. GregTech CEu multiblock tick overhead
GregTech CEu Modern's multiblock machines — processing lines, large pipe networks, and power systems — are among the most demanding tick-overhead sources in the modding ecosystem once a base's processing chains scale up. This is a pattern consistent across every GregTech-based pack, not just this one. As more multiblocks come online, average tick time climbs, and the server can go from stable to laggy to timed-out over the course of a session rather than crashing cleanly at a single moment.
If crashes or freezes correlate with a specific player's base growing, or with several multiblocks running simultaneously, this is the most likely cause.
3. Skyblock void-world chunk edge cases
Void-based skyblock world generation can occasionally produce chunk-loading edge cases at platform boundaries — a pattern typical of any void-based skyblock pack, including this one. If a crash consistently happens near the edge of a player's island or platform, or when a player travels far from spawn into unloaded void chunks, this is worth checking before assuming it's a mod conflict.
4. Mod conflicts and corrupted config after an update
As with any actively updated modpack, a crash that appears right after a modpack version bump or a manual mod addition is usually a config or compatibility issue rather than a hardware problem. Roll back to the previous working modpack version to confirm whether the crash is new-version-specific before digging into logs further.
5. RAM under the pack's realistic floor
The real, verified floor for Star Technology is 8 GB — use that number rather than a generic guess based on the pack's own description. Under-provisioning doesn't usually show up as an instant clean crash; it shows up as cascading lag and longer garbage-collection pauses as GregTech's multiblock simulation and the skyblock world's loaded chunks compete for headroom, eventually tripping a tick timeout. If you're seeing gradual TPS decay before a crash rather than an abrupt one, check RAM allocation against the 8 GB floor first.
FAQ
Why does my Star Technology server freeze instead of crashing outright?+
This is the more common pattern than a hard crash. GregTech CEu multiblock machines (large ore-processing lines, pipe networks, and power systems) add real per-tick overhead, and once a base scales up, tick time creeps up gradually. You'll usually see TPS drop and rubberbanding for several seconds or minutes before the server either recovers or the watchdog kills it for a tick timeout — not an instant clean crash with an error you can point to.
Is 8GB really enough for a GregTech CEu skyblock pack like this?+
8GB is the real, verified floor for Star Technology specifically — not a generic guess. That's lower than what you'd assume from a typical tech-heavy modpack's own listing, but it holds for early-to-mid progression. As your GregTech processing lines and multiblock count grow substantially later in a playthrough, budget headroom above the floor rather than running exactly at it.
What's the first thing to check if the server won't boot at all?+
Java version. Star Technology runs on Forge 1.20.1, which requires Java 17 — a server running an older Java runtime (8 or 11) will fail to boot or crash immediately on launch. This is the single most common boot-failure cause across every Forge pack on 1.20.1, not unique to this pack, but worth ruling out first since it's a one-line fix.
Host Star Technology on hardware sized for its real floor
Star Technology's GregTech CEu multiblock load needs the verified 8 GB floor to stay stable, and taking a backup before any risky config or version change keeps a bad update from turning into a lost base.
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