Github user JoshRosen commented on the issue:

    https://github.com/apache/spark/pull/15114
  
    I tried running this in SBT and ran into a bunch of spurious exceptions 
from logging code:
    
    ```
    SLF4J: Failed toString() invocation on an object of type 
[com.spotify.docker.client.messages.ProgressMessage]
    Reported exception:
    java.lang.NoClassDefFoundError: com/google/common/base/MoreObjects
                at 
com.spotify.docker.client.messages.ProgressMessage.toString(ProgressMessage.java:136)
                at 
org.slf4j.helpers.MessageFormatter.safeObjectAppend(MessageFormatter.java:300)
                at 
org.slf4j.helpers.MessageFormatter.deeplyAppendParameter(MessageFormatter.java:272)
                at 
org.slf4j.helpers.MessageFormatter.arrayFormat(MessageFormatter.java:234)
                at 
org.slf4j.helpers.MessageFormatter.arrayFormat(MessageFormatter.java:173)
                at 
org.slf4j.helpers.MessageFormatter.format(MessageFormatter.java:151)
                at 
org.slf4j.impl.Log4jLoggerAdapter.info(Log4jLoggerAdapter.java:346)
                at 
com.spotify.docker.client.LoggingPullHandler.progress(LoggingPullHandler.java:45)
                at 
com.spotify.docker.client.ProgressStream.tail(ProgressStream.java:74)
                at 
com.spotify.docker.client.DefaultDockerClient.pull(DefaultDockerClient.java:905)
                at 
com.spotify.docker.client.DefaultDockerClient.pull(DefaultDockerClient.java:879)
                at 
com.spotify.docker.client.DefaultDockerClient.pull(DefaultDockerClient.java:873)
                at 
org.apache.spark.sql.jdbc.DockerJDBCIntegrationSuite.beforeAll(DockerJDBCIntegrationSuite.scala:98)
                at 
org.scalatest.BeforeAndAfterAll$class.beforeAll(BeforeAndAfterAll.scala:187)
                at 
org.apache.spark.SparkFunSuite.beforeAll(SparkFunSuite.scala:29)
                at 
org.scalatest.BeforeAndAfterAll$class.run(BeforeAndAfterAll.scala:253)
                at org.apache.spark.SparkFunSuite.run(SparkFunSuite.scala:29)
                at 
org.scalatest.tools.Framework.org$scalatest$tools$Framework$$runSuite(Framework.scala:357)
                at 
org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:502)
                at sbt.ForkMain$Run$2.call(ForkMain.java:296)
                at sbt.ForkMain$Run$2.call(ForkMain.java:286)
                at java.util.concurrent.FutureTask.run(FutureTask.java:266)
                at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
                at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
                at java.lang.Thread.run(Thread.java:745)
    ```
    
    This didn't lead to test failures but made the test output a bit noisy 
while it was downloading images for the first time. This seems like it might be 
tricky to fix, though, so I'm going to merge this now to unblock developers who 
might rely on these tests. Thanks!


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