Forge server with Docker

[Sunser]

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, 2018 by Sunser
Dockerfile has been edited

[Cloudy]

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?