[3.8.1 - Grid] - javax.management.InstanceAlreadyExistsException when re-registering a node

[EugeneS30]

Meta -

OS:
Windows 7
Selenium Version:
3.8.1
Browser:
NA
Browser Version:
NA

Expected Behavior -

When a node goes down and then up again, it should print relevant information in log. For example:

When node registers for the first time:
10:22:21.591 INFO - Registered a node http://xx.xx.xx.xx:5555

Then if the node goes down:
13:27:19.249 INFO - Marking the node http://xx.xx.xx.xx:5555 as down: cannot reach the node for 2 tries

And when the node starts up again:

13:27:29.213 INFO - Registered a node http://xx.xx.xx.xx:5555
13:27:29.213 WARN - Cleaning up stale test sessions on the unregistered node http://xx.xx.xx.xx:5555

Actual Behavior -

At the moment when a node goes down and comes up again, there is the following exception printed out in hub log:

javax.management.InstanceAlreadyExistsException: org.seleniumhq.grid:type=RemoteProxy,node="http://10.25.67.96:5556"
        at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:437)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(DefaultMBeanServerInterceptor.java:1898)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:966)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:900)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:324)
        at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522)
        at org.openqa.selenium.remote.server.jmx.JMXHelper.register(JMXHelper.java:31)
        at org.openqa.grid.selenium.proxy.DefaultRemoteProxy.<init>(DefaultRemoteProxy.java:74)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
        at org.openqa.grid.internal.BaseRemoteProxy.getNewInstance(BaseRemoteProxy.java:366)
        at org.openqa.grid.web.servlet.RegistrationServlet.process(RegistrationServlet.java:104)
        at org.openqa.grid.web.servlet.RegistrationServlet.doPost(RegistrationServlet.java:71)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
        at org.seleniumhq.jetty9.servlet.ServletHolder.handle(ServletHolder.java:841)
        at org.seleniumhq.jetty9.servlet.ServletHandler.doHandle(ServletHandler.java:535)
        at org.seleniumhq.jetty9.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)
        at org.seleniumhq.jetty9.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
        at org.seleniumhq.jetty9.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)
        at org.seleniumhq.jetty9.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)
        at org.seleniumhq.jetty9.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)
        at org.seleniumhq.jetty9.servlet.ServletHandler.doScope(ServletHandler.java:473)
        at org.seleniumhq.jetty9.server.session.SessionHandler.doScope(SessionHandler.java:1564)
        at org.seleniumhq.jetty9.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)
        at org.seleniumhq.jetty9.server.handler.ContextHandler.doScope(ContextHandler.java:1155)
        at org.seleniumhq.jetty9.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
        at org.seleniumhq.jetty9.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.seleniumhq.jetty9.server.Server.handle(Server.java:561)
        at org.seleniumhq.jetty9.server.HttpChannel.handle(HttpChannel.java:334)
        at org.seleniumhq.jetty9.server.HttpConnection.onFillable(HttpConnection.java:251)
        at org.seleniumhq.jetty9.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
        at org.seleniumhq.jetty9.io.FillInterest.fillable(FillInterest.java:104)
        at org.seleniumhq.jetty9.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
        at org.seleniumhq.jetty9.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:247)
        at org.seleniumhq.jetty9.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:140)
        at org.seleniumhq.jetty9.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)
        at org.seleniumhq.jetty9.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:243)
        at org.seleniumhq.jetty9.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:679)
        at org.seleniumhq.jetty9.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:597)
        at java.lang.Thread.run(Thread.java:745)

Steps to reproduce -

1. Start Selenium Hub 3.8.1
2. Start Selenium Node 3.8.1
3. Make sure the node is successfully bound to the hub (see the hub.error.log)
4. Stop Selenium node
5. Wait until node marked is down by Selenium server (see the hub.error.log)
6. Start the node again
7. Find the above mentioned exception printed out in hub log.

[fbarletta]

@barancev - Is there a reason this was closed? I am also having this issue.

[barancev]

This issue was fixed by commit c067d6b, the fix was released in version 3.9.0

[fbarletta]

Awesome. I'll check it out and report any findings.

…

On Sun, Apr 8, 2018 at 3:54 PM, Alexei Barantsev ***@***.***> wrote: This issue was fixed by commit c067d6b <c067d6b>, the fix was released in version 3.9.0 — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#5186 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AEHAc6srnBAFe0QRVYMyk-dyGqrswLuFks5tmmsAgaJpZM4Q5BmU> .

-- Francis Barletta CEO UPTOP www.liveuptop.com