The Tool Desk
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Start with evidence, not more restarts
Repeated startup attempts can overwrite the useful context in the logs. Stop the process and copy the newest files before deleting, replacing, or “fixing” anything.
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latest.log— the primary runtime log. NeoForge describes it as the most important log because it contains Forge/NeoForge and mod output.debug.log— the more detailed companion log, when the pack or loader creates it.crash-reports/crash-*.txt— a report generated for a crash that reaches the crash-report stage.logs/serverstart.log— startup and crash diagnostics written by the AllTheMods server scripts.
On a standard server installation these are inside the server directory. If the script was launched from another working directory, use the directory shown by the script or console rather than assuming the location. Preserve the files with the date and time in their names so you can compare attempts.
In each file, begin at the bottom and search upward for ERROR, Exception, Caused by, Missing, Unsupported, mod, Java, and OutOfMemoryError. The final line saying that the server stopped is normally a consequence, not the cause. A stack trace naming a mod, library, Java class, or missing dependency is more actionable.
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Identify which kind of failure you have
Use the wording around the first exception to choose the shortest path. A server can show several follow-on errors after one underlying mismatch, so fix the earliest specific cause and test once.
| What you see | Most likely area | First check |
|---|---|---|
| The script closes before Minecraft loads | Java, script location, permissions, EULA, or missing libraries | Read logs/serverstart.log; verify Java and the server directory |
UnsupportedClassVersionError or a Java-version message |
Java major version or architecture | Run the same Java executable used by the script and compare it with the pack instructions |
MissingModsException, missing dependency, or a version-range error |
Incomplete or mismatched mod set | Compare the named component with the exact server-pack manifest |
| A mixin, renderer, screen, or client class is mentioned | Client-only mod on a dedicated server, or an incompatible build | Check the mod’s server-side classification and restore the pack’s original files |
OutOfMemoryError or the process is killed while loading |
Heap limit or host memory pressure | Inspect -Xms, -Xmx, and the machine’s available memory |
| The server starts but clients cannot join | Client/server pack, Minecraft, or loader mismatch | Confirm every player uses the same pack release and loader versions |
Verify Java and that it is 64-bit
AllTheMods startup scripts check Java and warn that an installation that is missing, too old, or not 64-bit may prevent the server from running correctly. A 32-bit installation can also impose a much lower practical heap ceiling even when the command itself appears to work.
Check the executable the script will actually use
- Open a terminal in the server directory.
- Run
java -versionand record the major version and vendor shown. - On Windows, run
where java; on Linux or macOS, runwhich java. If several paths appear, the first one may not be the one you intended. - Inspect the startup script or its configuration for an explicit Java path. If it points to a bundled or custom executable, run that executable directly with
-versioninstead of relying on the systemPATH.
To verify architecture, run java -XshowSettings:properties -version and look for sun.arch.data.model=64 in the output. If the script uses another executable, substitute that path in the command. Do not install a random “latest Java” build: use the major version specified by the particular All the Mods release, because packs can target different Minecraft and loader generations.
Remove conflicts
When multiple Java installations are present, remove obsolete entries from PATH or set the server script/configuration to the intended executable. Reopen the terminal after changing environment variables. If the AllTheMods script offers a validation step, do not bypass it until the reported version and architecture are correct; skipping validation can leave the server unable to start.
Rebuild from the exact server pack
The safest repair for a damaged or uncertain installation is a clean directory populated by the server files for the exact All the Mods release your clients use. A client installation and a dedicated-server installation are not interchangeable.
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- Record the pack name, revision, Minecraft version, and Forge or NeoForge build from the client launcher or pack metadata.
- Obtain the matching server pack supplied for that release, if one is provided.
- Create a new, empty server directory. Do not mix it with an older world,
modsfolder, libraries, or configuration files during the first test. - Extract the server pack without nesting it in an extra directory level. The launcher script and its libraries should be where the script expects them.
- Run the supplied installer or start script from that directory. Let it generate libraries and configuration files rather than copying them from a client instance.
- After the clean instance reaches a normal prompt, stop it and copy your world and carefully reviewed configuration files one at a time. Keep the original directory as a rollback.
Do not copy a client’s entire mods directory into a dedicated server. NeoForge notes that whether a mod is client-only is not always obvious from its name, and classification can require trial and error. The server pack is the higher-certainty baseline because its files are selected for server use.
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A Forge or NeoForge build that is merely newer, or “close” to the required build, can fail during loading. Confirm all four identifiers and compare them with the server log:
| Identifier | What must match | Where to verify |
|---|---|---|
| All the Mods release | Exact pack revision used by the clients and the server pack | Pack metadata, launcher profile, and server-pack download name |
| Minecraft version | The exact game version, including minor release where shown | Pack metadata and early lines in latest.log |
| Loader family and build | Forge versus NeoForge, plus the exact required build | Pack instructions and the server log; the AllTheMods FAQ advises using the specified Forge version rather than simply the latest one |
| Java major version | The version required by that pack and loader combination | Pack instructions, script validation output, and java -version |
If any one of these differs, replace the mismatched component with the version from the server pack instead of trying to compensate with memory settings or individual mod updates. Updating one mod or loader independently can create a second mismatch.
Complete first-run setup: EULA, folder, and script
Accept the EULA deliberately
On first launch, the server may create eula.txt and stop. Open that file, read the linked Minecraft EULA, and change the acceptance setting only if you agree to it. Start the server again from the same directory. If the script reports that the EULA is missing or unreadable, check that the file is beside the launcher script and that the account running the server can read and write it.
Run from the intended directory
Folder errors occur when a shortcut, service, or shell starts the script with a different working directory. Use an interactive terminal in the server folder for the first successful launch. Confirm that the directory contains the supplied script, the generated libraries, eula.txt, and the expected config and mods directories. The AllTheMods scripts perform folder checks and record failures in logs/serverstart.log.
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Check permissions and file completeness
The account running the process needs permission to create logs, libraries, configuration files, and world data. On Linux or macOS, make the supplied script executable if the pack instructions require it, then run it from the server directory. On Windows, avoid extracting the pack into a protected system directory and check that security software has not quarantined a library. Re-extracting the official server pack into a clean directory is safer than guessing which file is missing.
Set memory arguments without hiding the real error
The launch configuration normally exposes -Xms (initial heap) and -Xmx (maximum heap). Adjust them only after Java, versions, and files are correct. The available setting depends on the pack revision, world size, mods, player count, and host; there is no single RAM figure that applies to every All the Mods server.
- Leave headroom for the operating system and other services. Assigning nearly all physical memory to
-Xmxcan cause the operating system or a container to kill the process. - Keep
-Xmsat a level the machine can provide immediately. An initial heap larger than available memory can fail before world loading. - Change one value at a time and keep the previous arguments in a backup copy.
- Read the log after each test. A genuine
OutOfMemoryErroror host-level kill supports a memory change; a missing-mod or Java-version exception does not.
Use the documented JVM-arguments file or the arguments section of the supplied script. Do not add an unrelated optimization bundle while diagnosing a crash: it makes the next stack trace harder to interpret and can introduce another incompatibility.
Fix the first mod, dependency, or mixin named in the trace
When the report identifies a mod, library, mixin, or dependency, treat that name as the next investigation target. Compare its filename and version with the exact server-pack manifest. A generic “mod loading failed” line often follows the specific error, so work upward to the first Caused by block or missing-artifact message.
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Missing dependency or wrong version
Restore the dependency from a clean copy of the matching server pack. Do not download an arbitrary newer jar to satisfy a version range unless the pack author explicitly specifies it. Check for duplicate jars with different versions; leaving both can produce class or registry conflicts.
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Client-only content
Dedicated servers cannot load code that expects a client renderer, screen, key binding, or other client environment. If the trace names such a class, compare the file with the server pack and remove only the client-only jar from the server copy. Keep the client copy only when the pack’s documented arrangement supports it. Because client/server classification is not always obvious, make a backup and test one change at a time.
Mixin and transformation failures
A mixin error can result from an incompatible loader build, a changed dependency, or a mod applied in the wrong environment. First restore the exact loader and pack files. If the same mixin still fails, use the named mod and target class to identify the conflicting component rather than disabling unrelated mods.
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Safe isolation procedure
- Stop the server and copy the complete directory, including the world and logs.
- Remove or move only the jar named by the first meaningful exception.
- Start once and record the new log.
- If the server now starts, compare that jar against the clean server-pack copy and the clients’ manifest.
- If another error appears, restore the original file and resolve the new dependency chain instead of permanently deleting files at random.
Choose between in-place repair and a clean rebuild
| Recovery path | World preservation | Time to first test | Certainty files match the pack | Control |
|---|---|---|---|---|
| In-place repair | Highest immediate preservation; keep a full backup first | Usually faster when one named file is clearly wrong | Lower, because old jars, configs, and libraries can remain hidden | Full control over Java, memory, networking, and custom settings |
| Clean server-pack rebuild | Preserve the world by copying it after the clean test | Requires reinstallation and a first-run setup | Highest; starts from the pack’s intended manifest | Full control after rebuilding |
| Managed modded hosting | Depends on the provider’s backup and migration tools | Often simpler because installation, updates, restarts, and backups are managed | Depends on the provider’s pack implementation | Less control over Java paths, JVM flags, and system access |
For an unknown or heavily modified directory, a clean rebuild offers the clearest answer: if it starts, the old installation contained a mismatch. Copy the world only after the clean server has generated its files, and then reintroduce custom configuration deliberately.
Symptom-by-symptom recovery branches
The console closes instantly
Launch the script from an open terminal so the message remains visible. Read logs/serverstart.log, verify the Java path and 64-bit architecture, confirm the working directory, and check for an EULA or permission failure. If the script cannot find its libraries, rebuild from the server pack rather than copying a client launcher folder.
Loading reaches a percentage and then crashes
Open the crash report and latest.log. Find the first named mod, dependency, mixin, or Java exception. Confirm the loader build and Minecraft version before changing that mod; a loader mismatch can make an otherwise valid mod appear to be the culprit.
The server reports a missing mod after an update
Compare the client and server pack revisions, then compare the exact jar names and versions. Do not update only the server or only one client. Reinstall the matching server pack if files were added or removed manually.
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Check for OutOfMemoryError in the logs and for a host or container memory-limit message outside Minecraft. Review -Xms and -Xmx, lower the allocation if the host is under pressure, and leave operating-system headroom. A silent kill is not evidence that a mod is missing.
Clients receive a registry, channel, or version mismatch
Make a version matrix for the server and one affected client: pack revision, Minecraft version, loader family/build, and Java major version. Install the same release on both sides. A server can finish startup while still rejecting clients whose pack contents differ.
Keep the next failure diagnosable
- Keep the clean server directory and the original directory separate; never overwrite the only copy of a working world.
- Record the Java executable path, major version, loader build, pack revision, and JVM arguments beside the server backup.
- Update the pack as a complete release, not by replacing individual mods unless its documentation calls for that procedure.
- Back up the world before every loader, pack, or configuration change.
- When asking for help, include the relevant portions of
latest.log,debug.log, the crash report, andlogs/serverstart.log, with personal paths and credentials removed.
The practical order is consistent: capture logs, validate the Java executable and architecture, rebuild from the exact server pack, match Minecraft and Forge/NeoForge versions, complete EULA and folder setup, tune heap only when the evidence points to memory, and then isolate the first named mod or dependency. This prevents a speculative memory change or random jar replacement from obscuring the real startup error.
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