Hi everyone, I'm trying to run a forge server using docker, but it doesn't work.

- I've used the forge installer on the path of the directory I'm working in.

- "java -jar forge.jar" is working in the console.

- I get this error message when I'm trying to run it with docker :

Quote

We appear to be missing one or more essential library files.
You will need to add them to your server before FML and Forge will run successfully.java.lang.ClassNotFoundException: net.minecraft.launchwrapper.Launch
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:44)
    at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:31)

 

- I think I've added all useful files in my Docker image, but it seems I'm wrong. This is my Dockerfile :

FROM openjdk:8u131-jre-alpine
MAINTAINER Baptiste Chocot

USER root

RUN mkdir /minecraft
ADD forge-1.10.2-12.18.3.2185-universal.jar /minecraft
RUN mkdir /minecraft/libraries
ADD libraries/* /minecraft/libraries/
RUN mkdir /minecraft/mods
ADD mods/* /minecraft/mods/
RUN mkdir /minecraft/resourcepacks
ADD VERSION /minecraft
RUN mkdir /minecraft/versions
ADD versions/* /minecraft/versions/
RUN mkdir /minecraft/logs
ADD logs/* /minecraft/logs/
ADD minecraft_server.1.10.2.jar /minecraft
ADD installer.log /minecraft
ADD init.sh /minecraft
RUN ls -la minecraft/libraries
RUN chmod +x /minecraft/init.sh

EXPOSE 25565
CMD java -jar forge-1.10.2-12.18.3.2185-universal.jar

- The ls -la libraries shows this, so I guess libraries are not the problem :

Step 19/22 : RUN ls -la minecraft/libraries
 ---> Running in c51cf9f66828
total 100
drwxr-xr-x   25 root     root          4096 Feb 25 15:49 .
drwxr-xr-x   11 root     root          4096 Feb 25 15:50 ..
drwxr--r--    3 root     root          4096 Feb 18 19:40 OptiFine
drwxr--r--    5 root     root          4096 Feb 18 19:38 apache
drwxr--r--    4 root     root          4096 Feb 18 19:40 commons-codec
drwxr--r--    4 root     root          4096 Feb 18 19:40 commons-io
drwxr--r--    3 root     root          4096 Feb 18 19:40 commons-logging
drwxr--r--    4 root     root          4096 Feb 18 19:38 google
drwxr--r--    3 root     root          4096 Feb 18 19:38 ibm
drwxr--r--    5 root     root          4096 Feb 18 19:38 java
drwxr--r--    3 root     root          4096 Feb 18 19:40 jline
drwxr--r--    3 root     root          4096 Feb 18 19:38 lwjgl
drwxr--r--    3 root     root          4096 Feb 18 19:40 lzma
drwxr--r--    3 root     root          4096 Feb 18 19:39 minecraft
drwxr--r--    5 root     root          4096 Feb 18 19:39 minecraftforge
drwxr--r--    7 root     root          4096 Feb 18 19:39 mojang
drwxr--r--    3 root     root          4096 Feb 18 19:39 netty
drwxr--r--    3 root     root          4096 Feb 18 19:40 oshi-core
drwxr--r--    3 root     root          4096 Feb 18 19:38 ow2
drwxr--r--    7 root     root          4096 Feb 18 19:39 paulscode
drwxr--r--   10 root     root          4096 Feb 18 19:38 scala-lang
drwxr--r--    4 root     root          4096 Feb 18 19:38 sf
drwxr--r--    4 root     root          4096 Feb 18 19:38 typesafe
drwxr--r--    3 root     root          4096 Feb 18 19:38 unimi
drwxr--r--    3 root     root          4096 Feb 18 19:40 vecmath

If anyone know what I missed or did wrong, please help me.

Edited February 25, 20187 yr by Sunser
Dockerfile has been edited

Rather than add the files from your .minecraft folder it would be best to do it from a separate contained server instance created using the forge installer.

 

Also, I'm not that familiar with Docker so I'm not sure if I'm missing anything but I don't see you changing to the minecraft dir before running the forge jar.

 

Is there a chance that the forge jar is in the root of the image and not in the sub folder, hence not being able to find the library folder?