Dependency conflict with slf4j

[npetunin-clgx]

When we are using this library, in Spark job, we see the following conflict:

Caused by: java.lang.LinkageError: loader constraint violation in interface itable initialization: when resolving method "com.google.cloud.spark.bigquery.BigQueryUtilScala$.org$apache$spark$internal$Logging$$log_()Lorg/slf4j/Logger;" the class loader (instance of org/apache/spark/util/ChildFirstURLClassLoader) of the current class, com/google/cloud/spark/bigquery/BigQueryUtilScala$, and the class loader (instance of sun/misc/Launcher$AppClassLoader) for interface org/apache/spark/internal/Logging have different Class objects for the type org/slf4j/Logger used in the signature 

We found that we have extra slf4j dependency in the bigquery connector dependency tree in Bigquery Connector version: 0.18.0. We tried to exclude slf4j dependency from arrow-vector, build it and try customized jar. And we didn't see error specified above.

We would like to exclude slf4j-api dependency from arrow-vector as follows:

"org.apache.arrow" % "arrow-vector" % "0.16.0" exclude("org.slf4j", "slf4j-api"), 

in Line 82 in build.sbt file.

[stsai-clgx]

hi @davidrabinowitz,
thank you for resolving this issue. When will next release become available?