Publis one port with Random host port

[Khazrak]

The client can host specific ports and publish all exposed ports with random ports.

But if you want to publish just on port with random host port, this doesn't seem to work.
the docker command would be "docker run -d -p 8080 " then 8080 would be random.

If I interpret the Remote API then a empty String should do it, but it didn't work with the PortBinding as it is now. Maybe empty string isn't sent and it sees it as null?

[m0schaefer]

Worked for me:

Map<String, ArrayList> portBinding = new HashMap<>();

ArrayList hostPort = new ArrayList<>();
PortBinding portBindingHttp = new PortBinding();
portBindingHttp.setHostPort("");
hostPort.add(portBindingHttp);
portBinding.put("8080/tcp", hostPort);

HostConfig hostConfig = new HostConfig();
hostConfig.setPortBindings(portBinding);

client.container().createNew()
.withImage(imageName)
.withName(containerName)
.withHostConfig(hostConfig)
...

Map<String, ArrayList> portMapping = client.container().withName(container.getId()).inspect().getNetworkSettings().getPorts();
String port = portMapping.get("8080/tcp").stream().findFirst().get().getHostPort();