Hello, I have this lines in my build.gradle, but when I build the mod and start Minecraft with the mod in Modrinth it says 

Quote

java.lang.NoClassDefFoundError: org/java_websocket/server/WebSocketServer

Can anyone help me with this problem?

jarJar.enable()

dependencies {
    minecraft "net.minecraftforge:forge:${minecraft_version}-${forge_version}"
    annotationProcessor("org.spongepowered:mixin:0.8.5-SNAPSHOT:processor")

    // Forge"s hack fix
    implementation("net.sf.jopt-simple:jopt-simple:5.0.4") { version { strictly "5.0.4" } }

    // WebSocket
    minecraftLibrary "org.java-websocket:Java-WebSocket:1.5.3"
    jarJar(implementation("org.java-websocket:Java-WebSocket:1.5.3"))
}

 

Change

 

// WebSocket minecraftLibrary "org.java-websocket:Java-WebSocket:1.5.3"

jarJar(implementation("org.java-websocket:Java-WebSocket:1.5.3"))

 

to

 

// WebSocket
jarJar("org.java-websocket:Java-WebSocket:1.5.3")

 

 

 

 

 

Thanks for your answer, but sadly it still doesn't work. Without minecraftLibrary I can't even build the mod and with it I still get the same error.

Hm I have no idea

 

Try replacing implementation with minecraftLibrary. Dependencies in the minecraftLibrary configuration are added to your compile and runtime classpaths in ForgeGradle 6.