Get selected slice of dvt:pieChart using custom selection listener in ADF

First of all wishing a very Happy New Year to all of you, New Year is like a blank page , fill it with happiness and good memories

This post is about a simple requirement - How to get selected slice value of dvt:pieChart ?
So for this we have to create a custom selection Listener in managed bean that will be called whenever user selects any slice of pieChart
If you see documentation of pieChart it tells about two properties -

Create REST Web Service with Application Module declaratively in ADF 12.2.1

REST stands for Representational State Transfer, REST is an architectural style not a protocol as SOAP that's why it can use any other protocol like SOAP, HTTP etc.
REST requires less bandwidth and resources (lighter) than SOAP

New ADF 12.2.1 supports creating RESTful web services directly from Application Module, In previous versions we have to do everything manually
See- Create RESTful services on top of ADF Business Components

Create SOAP Web Service with Application Module quickly in ADF 12.2.1

SOAP stands for Simple Object Access Protocol, a protocol to exchange information in XML format between two applications over HTTP. This protocol is used to create ,access and consume web services.

SOA (Service Oriented Architecture) focuses on re-usability and exposing application module as web service makes it's methods and objects accessible from any device , any platform and these methods and objects can be further used by any other application