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    Take a look at this blog post on how to set up Grid2 https://goo.gl/rxzbE6. A user related (in the email group on the source) that using older selenium libs solves this exception.

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via Atlassian JIRA by David Currie [Atlassian], 1 year ago
via Atlassian JIRA by David Currie [Atlassian], 1 year ago
via JIRA by Sangho Shin, 1 year ago
via Atlassian JIRA by Clarissa Gauterio, 1 year ago
This exception has no message.
via Atlassian JIRA by Clarissa Gauterio [Atlassian], 1 year ago
This exception has no message.
via GitHub by SlimeDog
, 2 months ago
This exception has no message.
java.lang.NullPointerException: 	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:180)	at com.atlassian.jira.notification.NotificationRecipient.(NotificationRecipient.java:36)	at com.atlassian.jira.notification.type.UserToRecipient.apply(UserToRecipient.java:21)	at com.atlassian.jira.notification.type.UserToRecipient.apply(UserToRecipient.java:14)	at com.google.common.collect.Lists$TransformingRandomAccessList.get(Lists.java:431)	at java.util.AbstractList$Itr.next(AbstractList.java:345)	at java.util.AbstractCollection.addAll(AbstractCollection.java:305)	at com.atlassian.jira.notification.DefaultNotificationSchemeManager.getRecipients(DefaultNotificationSchemeManager.java:279)	at com.atlassian.jira.event.listeners.mail.MailListener.createMailItems(MailListener.java:122)	at com.atlassian.jira.event.listeners.mail.MailListener.sendNotification(MailListener.java:87)	at com.atlassian.jira.event.listeners.mail.MailListener.issueCommented(MailListener.java:188)	at com.atlassian.jira.event.issue.AbstractIssueEventListener.workflowEvent(AbstractIssueEventListener.java:106)	at com.atlassian.jira.event.issue.IssueEventListenerHandler$IssueEventInvoker.invoke(IssueEventListenerHandler.java:49)	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$2.run(AsynchronousAbleEventDispatcher.java:60)	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$1.execute(AsynchronousAbleEventDispatcher.java:28)	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher.dispatch(AsynchronousAbleEventDispatcher.java:56)	at com.atlassian.event.internal.EventPublisherImpl.invokeListeners(EventPublisherImpl.java:151)	at com.atlassian.event.internal.EventPublisherImpl.publish(EventPublisherImpl.java:70)	at sun.reflect.GeneratedMethodAccessor43.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.atlassian.multitenant.impl.MultiTenantComponentFactoryImpl$AbstractMultiTenantAwareInvocationHandler.invokeInternal(MultiTenantComponentFactoryImpl.java:181)	at com.atlassian.multitenant.impl.MultiTenantComponentFactoryImpl$MultiTenantAwareInvocationHandler.invoke(MultiTenantComponentFactoryImpl.java:211)	at $Proxy5.publish(Unknown Source)	at com.atlassian.multitenant.event.DefaultPeeringEventPublisherManager.publish(DefaultPeeringEventPublisherManager.java:17)	at com.atlassian.multitenant.event.PeeringEventPublisher.publish(PeeringEventPublisher.java:23)	at com.atlassian.jira.event.issue.IssueEventDispatcher.dispatchEvent(IssueEventDispatcher.java:254)	at com.atlassian.jira.event.issue.IssueEventDispatcher.dispatchEvent(IssueEventDispatcher.java:176)	at com.atlassian.jira.web.action.issue.AddComment.alertSystemOfComment(AddComment.java:144)	at com.atlassian.jira.web.action.issue.AddComment.doExecute(AddComment.java:109)	at webwork.action.ActionSupport.execute(ActionSupport.java:165)	at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:76)	at webwork.interceptor.DefaultInterceptorChain.proceed(DefaultInterceptorChain.java:39)	at webwork.interceptor.NestedInterceptorChain.proceed(NestedInterceptorChain.java:31)	at webwork.interceptor.ChainedInterceptor.intercept(ChainedInterceptor.java:16)	at webwork.interceptor.DefaultInterceptorChain.proceed(DefaultInterceptorChain.java:35)	at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:205)	at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:143)	at com.atlassian.jira.web.dispatcher.JiraWebworkActionDispatcher.service(JiraWebworkActionDispatcher.java:152)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)