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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 Kathryn Grier [Atlassian], 1 year ago
via Atlassian JIRA by Kathryn Grier [Atlassian], 1 year ago
via GitHub by apakulov
, 2 years ago
This exception has no message.
via GitHub by apakulov
, 2 years ago
This exception has no message.
via GitHub by Justin-Johnson
, 2 years ago
via Stack Overflow by Jonas Vandevelde
, 2 years ago
This exception has no message.
java.lang.NullPointerException: 	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:187)	at com.atlassian.webhooks.api.util.TypeRichString.(TypeRichString.java:32)	at com.atlassian.webhooks.api.util.Filter.(Filter.java:21)	at com.atlassian.webhooks.api.register.listener.PersistentWebHookListener$Builder.addFilter(PersistentWebHookListener.java:190)	at com.atlassian.jira.plugins.webhooks.listener.JqlFilterStoreUtils$JqlAwarePersistentListenerBuilder.setJqlFilter(JqlFilterStoreUtils.java:88)	at com.atlassian.jira.plugins.webhooks.store.JiraWebHookListenerStore.createWebHookListener(JiraWebHookListenerStore.java:150)	at com.atlassian.jira.plugins.webhooks.store.JiraWebHookListenerStore.access$300(JiraWebHookListenerStore.java:25)	at com.atlassian.jira.plugins.webhooks.store.JiraWebHookListenerStore$6.apply(JiraWebHookListenerStore.java:142)	at com.atlassian.jira.plugins.webhooks.store.JiraWebHookListenerStore$6.apply(JiraWebHookListenerStore.java:138)	at com.google.common.collect.Iterators$8.next(Iterators.java:812)	at com.google.common.collect.Lists.newArrayList(Lists.java:139)	at com.google.common.collect.Lists.newArrayList(Lists.java:119)	at com.atlassian.jira.plugins.webhooks.store.JiraWebHookListenerStore.getAllWebHooks(JiraWebHookListenerStore.java:130)	at com.atlassian.webhooks.plugin.store.OsgiWebHookListenerStore$5.apply(OsgiWebHookListenerStore.java:90)	at com.atlassian.webhooks.plugin.store.OsgiWebHookListenerStore$5.apply(OsgiWebHookListenerStore.java:86)	at com.atlassian.webhooks.plugin.store.OsgiWebHookListenerStore.executeStoreFunction(OsgiWebHookListenerStore.java:103)	at com.atlassian.webhooks.plugin.store.OsgiWebHookListenerStore.getAllWebHooks(OsgiWebHookListenerStore.java:85)	at com.atlassian.webhooks.plugin.store.WebHookListenerCachingStore$1.get(WebHookListenerCachingStore.java:187)	at com.atlassian.webhooks.plugin.store.WebHookListenerCachingStore$1.get(WebHookListenerCachingStore.java:171)	at com.atlassian.webhooks.plugin.store.WebHookListenerCachingStore.getAllWebHookListeners(WebHookListenerCachingStore.java:79)	at com.atlassian.webhooks.plugin.api.SecuredWebHookListenerServiceImpl.getAllWebHookListeners(SecuredWebHookListenerServiceImpl.java:56)