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via Stack Overflow by Jordi
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uri was not specified
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java.lang.NullPointerException: uri was not specified at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:204) at com.github.dockerjava.core.DockerClientConfig$DockerClientConfigBuilder.withUri(DockerClientConfig.java:406) at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder$DescriptorImpl.createDockerClient(DockerBuilder.java:120) at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder$DescriptorImpl.getDockerClient(DockerBuilder.java:204) at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder$DescriptorImpl.doTestConnection(DockerBuilder.java:138) at sun.reflect.GeneratedMethodAccessor235.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498)