How to use com.fasterxml.jackson 2.8.1 and 2.6.5 in the same module of maven project? - maven

Question

I have a module which has Spark 2.1.0 and Presto 0.166.
Spark 2.1.0 requires com.faster.xml version 2.6.5 while Presto 0.166 requires 2.8.1 strictly. How Can I resolve the issue in the same pom.xml so that I can run them in the same module?

Answer 1

Simply specify the version of com-fasterxml-jackson in your pom file. The version specified here will override the versions in Spark 2.1.0 and Presto 0.166
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.8.1</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>2.1.0</version>
</dependency>
<dependency>
<groupId>com.facebook.presto</groupId>
<artifactId>presto...</artifactId>
<version>0.166</version>
</dependency>
Since, Spark 2.1.0 can use com.fasterxml.jackson 2.8.1, you won't need 2 different versions of it in your module.
Resources -
Introduction to the Dependency Mechanism

Answer 2

You cannot use multiple version(s) of same dependency in a single pom.xml, exclude-dependency com.faster.xml version either from Spark 2.1.0 or from Presto 0.166, for example:
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>2.1.0</version>
<exclusions>
<exclusion>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
</exclusion>
</exclusions>
</dependency>

Answer 3

Are you trying to write a plugin for Presto? If so, the Presto SPI explicitly depends on only jackson-annotations and not the implementation. There should be no problem with using the newer version of the annotations with an older version of Jackson within your plugin. The version of Jackson used by the Presto engine can and will be different from the one used by your plugin as plugins are loaded in a separate class loader.
The Presto plugin system is designed to have very minimal dependencies and allow you to use whatever versions of libraries you want (as that is often necessary when writing a connector to a random system that uses older versions of libraries).