* 🐛 Fixing some issues with threading and NPE
After running Sonar on the master branch, some major analysis
opportunities were displayed.
This fixes the use of SimpleDateFormat stored as static fields.
SimpleDateFormat is not thread-safe, and may retain data across threads.
While there's no indicator that this has caused any issues (these are
mostly used for example code), we should follow these best practices.
This also fixes a handful of NPE and other minor issues such as
comparing Boolean.TRUE to strings and no wrapping some closeables in
try-with-resources.
* [cli] Unit test GenerateBatch custom deserialization helper
* Quiet batch mode in sonar.yml
* Suppress unnecessary warnings (ThreadLocals in static fields)
