Added dependency management for Gson.
<dependencyManagement>
<dependencies>
+ <dependency>
+ <groupId>com.google.code.gson</groupId>
+ <artifactId>gson</artifactId>
+ <version>2.8.2</version>
+ </dependency>
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
