Github user dsbos commented on the pull request:
https://github.com/apache/drill/pull/116#issuecomment-131970908
It seems that you have shaded references to every Java package other than
org.apache.drill.** (not just for every package from every depended-on
artifact, but for _every_ package--including JDK packages).
Note how the following command says it can't find "oadd/java/sql/Driver":
$ java -cp ./exec/jdbc-all/target/drill-jdbc-all-1.2.0-SNAPSHOT.jar
org.apache.drill.jdbc.Driver
Exception in thread "main" java.lang.NoClassDefFoundError:
oadd/java/sql/Driver
...
It seems that in trying to load org.apache.drill.jdbc.Driver it tried to
load its base class, normally java.sql.Driver from the JDK, but the reference
to that base class was shaded to oadd.org.java.sql.Driver, so of course it
couldn't be found.
(The expected behavior of that command is an error that
org.apache.drill.jdbc.Driver doesn't have a main method.)
What setup did you use to test the shading?
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