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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.

Solutions on the web

via Atlassian JIRA by Knipper Jacques, 1 year ago
via Atlassian JIRA by Knipper Jacques, 2 years ago
via Stack Overflow by workwise
, 10 months ago
com.google.common.util.concurrent.UncheckedExecutionException: java.lang.NullPointerException The stack trace is also null. I am using eclipse. And cannot go through the steps (the debug panel gives a very top level function trace of where
via Atlassian JIRA by Mark Chaimungkalanont, 1 year ago
java.lang.NullPointerException
via Atlassian JIRA by Mark Chaimungkalanont, 2 years ago
via Atlassian JIRA by Mark Chaimungkalanont, 2 years ago
java.lang.NullPointerException
java.lang.NullPointerException: 	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:187)	at com.atlassian.jira.mail.BotoCssInliner.createStyles(BotoCssInliner.java:91)	at com.atlassian.jira.mail.BotoCssInliner.access$200(BotoCssInliner.java:24)	at com.atlassian.jira.mail.BotoCssInliner$BotocssCreator.load(BotoCssInliner.java:112)	at com.atlassian.jira.mail.BotoCssInliner$BotocssCreator.load(BotoCssInliner.java:107)	at com.google.common.cache.CustomConcurrentHashMap$ComputingValueReference.compute(CustomConcurrentHashMap.java:3426)	at com.google.common.cache.CustomConcurrentHashMap$Segment.compute(CustomConcurrentHashMap.java:2322)	at com.google.common.cache.CustomConcurrentHashMap$Segment.getOrCompute(CustomConcurrentHashMap.java:2291)	at com.google.common.cache.CustomConcurrentHashMap.getOrCompute(CustomConcurrentHashMap.java:3802)	at com.google.common.cache.ComputingCache.get(ComputingCache.java:46)	at com.google.common.cache.AbstractCache.getUnchecked(AbstractCache.java:49)	at com.atlassian.jira.mail.BotoCssInliner.applyStyles(BotoCssInliner.java:73)	at com.atlassian.jira.mail.builder.EmailRenderer.renderEmailBody(EmailRenderer.java:113)	at com.atlassian.jira.mail.builder.EmailRenderer.render(EmailRenderer.java:165)	at com.atlassian.jira.mail.builder.EmailBuilder.renderNow(EmailBuilder.java:162)	at com.atlassian.jira.mail.builder.EmailBuilder.renderNowAsQueueItem(EmailBuilder.java:152)	at com.atlassian.jira.mail.MailingListCompiler$1.processRecipient(MailingListCompiler.java:306)	at com.atlassian.jira.mail.NotificationRecipientProcessor.process(NotificationRecipientProcessor.java:39)	at com.atlassian.jira.mail.MailingListCompiler.addMailsToQueue(MailingListCompiler.java:331)	at com.atlassian.jira.mail.MailingListCompiler.access$200(MailingListCompiler.java:46)	at com.atlassian.jira.mail.MailingListCompiler$NotificationCompiler.addEmailsToQueue(MailingListCompiler.java:454)	at com.atlassian.jira.mail.MailingListCompiler$NotificationCompiler.sendLists(MailingListCompiler.java:424)	at com.atlassian.jira.mail.MailingListCompiler$NotificationCompiler.sendNoLevelsIgnoreGroup(MailingListCompiler.java:404)	at com.atlassian.jira.mail.MailingListCompiler$NotificationCompiler.sendToAll(MailingListCompiler.java:399)	at com.atlassian.jira.mail.MailingListCompiler.sendLists(MailingListCompiler.java:144)	at com.atlassian.jira.mail.IssueMailQueueItem.send(IssueMailQueueItem.java:149)	at com.atlassian.mail.queue.MailQueueImpl.sendBuffer(MailQueueImpl.java:66)	at com.atlassian.jira.service.services.mail.MailQueueService.run(MailQueueService.java:28)	at com.atlassian.jira.service.JiraServiceContainerImpl.run(JiraServiceContainerImpl.java:61)	at com.atlassian.jira.service.ServiceRunner.execute(ServiceRunner.java:48)	at org.quartz.core.JobRunShell.run(JobRunShell.java:195)	at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:520)