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    Expert tip

    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 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 saberchicken
, 4 months ago
This exception has no message.
via GitHub by Ironic8b498
, 10 months ago
This exception has no message.
via GitHub by panrufio
, 3 months ago
This exception has no message.
java.lang.NullPointerException: 	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:187)	at com.atlassian.jira.issue.attachment.CreateAttachmentParamsBean$Builder.build(CreateAttachmentParamsBean.java:242)	at com.atlassian.jira.issue.managers.DefaultAttachmentManager.transformTemporaryAttachment(DefaultAttachmentManager.java:428)	at com.atlassian.jira.issue.managers.DefaultAttachmentManager.access$200(DefaultAttachmentManager.java:92)	at com.atlassian.jira.issue.managers.DefaultAttachmentManager$3.apply(DefaultAttachmentManager.java:409)	at com.atlassian.jira.issue.managers.DefaultAttachmentManager$3.apply(DefaultAttachmentManager.java:405)	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.ImmutableList.copyOf(ImmutableList.java:256)	at com.google.common.collect.ImmutableList.copyOf(ImmutableList.java:217)