hi, many people faced a "mainclass not specified" error when run command  "java -jar target/elastic-core*.jar", cause there two jar file, and the mainClass setting maybe incorrect in dependency-reduced-pom.xml file. so I change that command to "java -jar `ls target/elastic-core*.jar | grep -v "source"`, this can fix this issue temporarily, but the best solution maybe fix the java mainClass setting error.

 I have created a pull request, you may check it and merge, so people can run the wallet correct.

btw, I also faced the dock issue, I just can't run from Docker,I can see it built successfully, but when I run the docker,nothing happened, and 'docker ps' command also output nothing.