What I see is the following ...

- Working configuration

Spark Version : "2.0.0-SNAPSHOT"

The Vert.x library brings ...
jackson-annotations:2.6.0
jackson-core:2.6.1
jackson-databind:2.6.1

Spark brings
jackson-annotations:2.6.5
jackson-core:2.6.5
jackson-databind:2.6.5
jackson-module-scala_2.11: 2.6.5

The runtime will use the latest version 2.6.5 and all works fine.

- NOT Working configuration

Spark Version : "2.0.0-preview"

The Vert.x library brings ... (same dependencies as before)
jackson-annotations:2.6.0
jackson-core:2.6.1
jackson-databind:2.6.1

Spark brings
jackson-module-scala_2.11: 2.5.3

The module scale related to jackson is 2.5.3 ... seems not work with above 
2.6.0/2.6.1 version ... so the exception.


> From: so...@cloudera.com
> Date: Sat, 2 Jul 2016 08:34:45 +0100
> Subject: Re: Spark 2.0.0-preview ... problem with jackson core version
> To: charles.al...@metamarkets.com
> CC: ppatie...@live.com; user@spark.apache.org
> 
> mvn dependency:tree?
> 
> On Sat, Jul 2, 2016 at 12:46 AM, Charles Allen
> <charles.al...@metamarkets.com> wrote:
> > I'm having the same difficulty porting
> > https://github.com/metamx/druid-spark-batch/tree/spark2 over to spark2.x,
> > where I have to go track down who is pulling in bad jackson versions.
> >
> 
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