The parameters "--publish-events" and "--subscribe-events" are not supported for 'hub' in selenium-4 alpha 6.

[leiwang008]

🐛 Bug Report

In previous alpha version, 'hub' command support parameter "--publish-events" and "--subscribe-events", but in version alpha 6, they are not supported anymore. How can we change the publish-port and subscribe-port if the default ports 4442, 4443 are already in use?

To Reproduce

java -jar selenium-server-4.0.0-alpha-6.jar hub --help

Detailed steps to reproduce the behavior:

Expected behavior

Expect it can support these parameters as before
--publish-events
  Connection string for publishing events to the event bus
--subscribe-events
  Connection string for subscribing to events from the event bus

Test script or set of commands reproducing this issue

1. I started a hub on port 6666 so that the default publish-port and subscribe-port will be occupied
   java -jar selenium-server-4.0.0-alpha-6.jar hub --port 6666
2. Then I started another hub on port 4444
   java -jar selenium-server-4.0.0-alpha-6.jar hub

the output is as below:
16:25:27.979 INFO [LoggingOptions.getTracer] - Using OpenTelemetry for tracing
16:25:27.980 INFO [LoggingOptions.createTracer] - Using OpenTelemetry for tracing
16:25:27.995 INFO [EventBusOptions.createBus] - Creating event bus: org.openqa.selenium.events.zeromq.ZeroMqEventBus
16:25:28.191 INFO [BoundZmqEventBus.] - XPUB binding to [binding to tcp://:4442, advertising as tcp://172.27.20.204:4442], XSUB binding to [binding to tcp://:4443, advertising as tcp://172.27.20.204:4443]
Exception in thread "main" java.lang.IllegalArgumentException: Unable to find event bus class: org.openqa.selenium.events.zeromq.ZeroMqEventBus
at org.openqa.selenium.grid.server.EventBusOptions.createBus(EventBusOptions.java:74)
at org.openqa.selenium.grid.server.EventBusOptions.getEventBus(EventBusOptions.java:44)
at org.openqa.selenium.grid.commands.Hub.execute(Hub.java:98)
at org.openqa.selenium.grid.TemplateGridCommand.lambda$configure$2(TemplateGridCommand.java:97)
at org.openqa.selenium.grid.Main.launch(Main.java:154)
at org.openqa.selenium.grid.Main.go(Main.java:88)
at org.openqa.selenium.grid.Main.main(Main.java:54)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.openqa.selenium.grid.server.EventBusOptions.createBus(EventBusOptions.java:69)
... 6 more
Caused by: org.zeromq.ZMQException: Errno 48 : Address already in use
at org.zeromq.ZMQ$Socket.mayRaise(ZMQ.java:3546)
at org.zeromq.ZMQ$Socket.bind(ZMQ.java:3000)
at org.openqa.selenium.events.zeromq.BoundZmqEventBus.(BoundZmqEventBus.java:55)
at org.openqa.selenium.events.zeromq.ZeroMqEventBus.create(ZeroMqEventBus.java:37)
at org.openqa.selenium.events.zeromq.ZeroMqEventBus.create(ZeroMqEventBus.java:53)
... 11 more

[hnestorova]

Hi @leiwang008 , @barancev , @titusfortner could you provide an example of how to specify these parameters because i cannot make them work . Here is the begining of the command:

start C:/"Program Files"/Java/jdk1.8.0_45/bin/java -jar selenium-server-alpha6.jar hub --port 4451

and what should be added to specify the "--publish-events" and "--subscribe-events" ? Thank you in advance!

[hnestorova]

@barancev , @titusfortner or maybe the fix is not in the alpha6 jar as I can see it is from May?