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

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uri was not specified
java.lang.NullPointerException: uri was not specified	at	at com.github.dockerjava.core.DockerClientConfig$DockerClientConfigBuilder.withUri(	at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder$DescriptorImpl.createDockerClient(	at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder$DescriptorImpl.getDockerClient(	at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder$DescriptorImpl.doTestConnection(	at sun.reflect.GeneratedMethodAccessor235.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(	at java.lang.reflect.Method.invoke(