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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 Christian Sarazin, 1 year ago
via Atlassian JIRA by Christian Sarazin, 1 year ago
via Atlassian JIRA by Paul Pasler, 1 year ago
via Atlassian JIRA by Joel Courtney, 1 year ago
via Atlassian JIRA by Steffen Buhr, 1 year ago
java.lang.NullPointerException: userkey	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:204)	at com.atlassian.sal.api.user.UserKey.(UserKey.java:27)	at com.atlassian.confluence.plugins.rest.entities.builders.PersonalInformationContentEntityBuilder.build(PersonalInformationContentEntityBuilder.java:123)	at com.atlassian.confluence.plugins.rest.service.DefaultRestSearchService.toSearchResultEntity(DefaultRestSearchService.java:274)	at com.atlassian.confluence.plugins.rest.service.DefaultRestSearchService.toSearchResultEntityList(DefaultRestSearchService.java:263)	at com.atlassian.confluence.plugins.rest.service.DefaultRestSearchService.makeSearchResultsEntityList(DefaultRestSearchService.java:223)	at com.atlassian.confluence.plugins.rest.service.DefaultRestSearchService.userSearch(DefaultRestSearchService.java:76)	at com.atlassian.confluence.plugins.rest.resources.SearchService.doUserSearch(SearchService.java:194)	at sun.reflect.GeneratedMethodAccessor3966.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)