Update FDK Java Example to v2 and latest Java

[michael-w-williams]

This is a sub issue to detail the Java examples that still need updating.

• Update Java FDK Reverse Example
• Update Java Regex Example: Update Java fdk Regex example to latest code. #82
• Update QR Code Example URL
• Async Thumbnails Example URL
• gradle Build example Update Java FDK gradle-build example to latest code #99