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ModsJava
JevMC - Library [26.3]
Java mod listed for Minecraft 26.x. Downloads from the MC Java Mods app on Android.
⬇ Download on Spigot
JevMC
A simple Java library for using
Jev by
TypeSafe.ai in
PaperMC/Spigot plugins.
JevMC is an unofficial Java SDK for the TypeSafe.ai API: a thin, dependency-free HTTP wrapper around POST /v1/systemone that exposes it as clean, typed Java classes. It contains no AI logic of its own.
Jev is a System One Model: you send it a state and typed questions, and it returns structured decisions with probabilities and confidence — no generated text to parse.
Features
- The 3 primitives: Noul (yes/no), Choice (pick an option) and Score (rate against a rubric)
- Asynchronous API via CompletableFuture, with automatic retries (exponential backoff) on 429/529 and network errors
- Zero shaded dependencies: uses java.net.http (Java 17+) and Gson, both already bundled with Paper
- Immutable types (records) and fully typed answers, including confidence
Installation
Add the library to your pom.xml (or install jevmc-1.0.0.jar into your local repository with mvn install):
Code (XML):
<dependency>
<groupId>dev.blancocl </groupId>
<artifactId>jevmc </artifactId>
<version>1.0.0 </version>
</dependency>
<groupId>dev.blancocl </groupId>
<artifactId>jevmc </artifactId>
<version>1.0.0 </version>
</dependency>
Basic usage
Code (Java):
// Create the client (ideally a single instance in your plugin)
JevClient jev = new JevClient ( System. getenv ( "TYPESAFE_API_KEY" ) ) ;
JevClient jev = new JevClient ( System. getenv ( "TYPESAFE_API_KEY" ) ) ;
Code (Java):
// Noul: yes/no question -> NoulAnswer (0.0 = no, 1.0 = yes)
Noul toxic = new Noul ( "The message is toxic or insulting" ) ;
// Choice: pick an option -> ChoiceAnswer(choice, probabilities, confidence)
Choice action = new Choice ( "Suggested action for staff",
Map. of ( "none", "The message is harmless",
"warn", "Warn the player",
"punish", "Mute or ban" ) ) ;
// Score: rate against a rubric -> ScoreAnswer(score, legend, probabilities, confidence)
Score severity = new Score ( "Severity of the message",
List. of ( "Harmless", "Annoying", "Offensive", "Severe" ) ) ;
// A single call evaluates every question in parallel
jev. evaluateAsync (
Map. of ( "player", "Steve", "message", "this server is garbage" ),
Map. of ( "toxic", toxic, "action", action, "severity", severity )
). thenAccept (response -> {
if (response. get ( "toxic", NoulAnswer. class ). isLikelyTrue ( 0.8 ) ) {
String suggestion = response. get ( "action", ChoiceAnswer. class ). choice ( ) ;
// ...
}
} ) ;
Noul toxic = new Noul ( "The message is toxic or insulting" ) ;
// Choice: pick an option -> ChoiceAnswer(choice, probabilities, confidence)
Choice action = new Choice ( "Suggested action for staff",
Map. of ( "none", "The message is harmless",
"warn", "Warn the player",
"punish", "Mute or ban" ) ) ;
// Score: rate against a rubric -> ScoreAnswer(score, legend, probabilities, confidence)
Score severity = new Score ( "Severity of the message",
List. of ( "Harmless", "Annoying", "Offensive", "Severe" ) ) ;
// A single call evaluates every question in parallel
jev. evaluateAsync (
Map. of ( "player", "Steve", "message", "this server is garbage" ),
Map. of ( "toxic", toxic, "action", action, "severity", severity )
). thenAccept (response -> {
if (response. get ( "toxic", NoulAnswer. class ). isLikelyTrue ( 0.8 ) ) {
String suggestion = response. get ( "action", ChoiceAnswer. class ). choice ( ) ;
// ...
}
} ) ;
Golden rule: never call the API on the main server thread. Use evaluateAsync (events like AsyncChatEvent already run off the main thread) and hop back with Bukkit.getScheduler().runTask(plugin, ...) before touching the Bukkit API.
Code (Java):
public
class MyPlugin
extends JavaPlugin
{
@Override
public void onEnable ( ) {
JevClient jev = new JevClient ( System. getenv ( "TYPESAFE_API_KEY" ) ) ;
Bukkit. getPluginManager ( ). registerEvents (
new ChatModerationListener ( this, jev ), this ) ;
}
}
@Override
public void onEnable ( ) {
JevClient jev = new JevClient ( System. getenv ( "TYPESAFE_API_KEY" ) ) ;
Bukkit. getPluginManager ( ). registerEvents (
new ChatModerationListener ( this, jev ), this ) ;
}
}
TypeSafe.ai API details
- Endpoint: POST https://api.typesafe.ai/v1/systemone
- Authentication: Authorization: Bearer <API_KEY> (get your key at console.typesafe.ai/keys)
- Model: jev-latest
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 26.3
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Spigot — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
JevMC - Library [26.3] is a free Minecraft Java mod. Compatible with Minecraft 26.3. Downloaded 3 times (via Spigot). Download it and open it directly in the game.