This repository packages apache-directory-studio with Docker, so you don't have to install an old JRE on your machine.
Run make to launch the container, and connect to localhost:5901 with your VNC client. Password is root.
To use the docker image instead, run the following commands:
$> docker volume create --name apache-directory-studio
$> docker run --rm -ti -v apache-directory-studio:/root/.ApacheDirectoryStudio -p '127.0.0.1:5901:5901' brmzkw/apache-directory-studio