This was the first official non-beta release of Jackson. Given that the first public pre-1.0 version was released in August 2007, development took over year and a half.

Overview of release is:

• Release date: May 9th, 2009.
• Codename: "Hazelnut" (curious historical fact: lots of people choke on nuts -- this has something to do with choosing the codename)
• Functionality:
  • High-performance [Streaming (incremental) parser/generator]
  • [Tree Model]
  • Fully functional [Data Binding] between Java objects and JSON.
    • Including basic set of annotations for configuring details like JSON property names.