NumberService.java

• Most of the configuration is done via annotations itself. The code just does the business logic (i.e to add 2 numbers)
• Path("/number/") annotation specifies the relative URI path that this class will serve is /number/
• Component annotation specifies that this class needs to be auto-detected when spring does the annotation based scan
• Scope("singleton") annotation specifies that this class needs to be a singleton instance in spring
• POST annotation specifies that the method will handle HTTP POST requests
• Consumes( { "application/x-www-form-urlencoded" }) annotation specifies that the method will handle requests with media type application/x-www-form-urlencoded
• Produces( { "text/plain" }) annotation specifies that the method will respond with the media type text/plain
• Path("add") annotation specifies the relative URI path that this method will serve is add
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