Docker file is outdated

[dragonxtek]

I tried to run dockerfile but it is no longer possible to install java. I downloaded java 8 from the oracle site. ADD target ./mudgee is not recognized so I downloaded the repo from git but I have errors when trying to install with maven.

mvn clean install
[ERROR] Error executing Maven.
[ERROR] java.lang.ExceptionInInInitializerError
[ERROR] Caused by: null
[ERROR] Caused by: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @3224f60b