jrjackson

a jruby library wrapping the JAVA jackson jars

provides:

JrJackson::Json.generate(obj) -> json string
JrJackson::Json.parse(str) -> hash like object

JrJackson::Smile.generate obj -> smile string
JrJackson::Smile.parse smile_str -> hash like object


Credit to Chuck Remes for the benchmark and initial
investigation when the jruby, json gem and the jackson
libraries were young.

I compared json-jruby 1.5.1 and jackson/smile 1.9.5 on jruby 1.6.7 and Java 7

                                        user     system      total        real
jackson generate:                   0.756000   0.000000   0.756000 (  0.756000)
smile generate:                     0.530000   0.000000   0.530000 (  0.530000)
ruby generate:                      2.754000   0.000000   2.754000 (  2.754000)
jackson parse:                      0.630000   0.000000   0.630000 (  0.630000)
smile parse:                        0.368000   0.000000   0.368000 (  0.368000)
ruby parse:                         2.102000   0.000000   2.102000 (  2.102000)

Variants:

jrjackson.rb
  this variant is the fastest but the parse function will
  return Java ArrayList instead of Ruby Array and
  Java LinkedHashMap instead of Ruby Hash.
  In Jruby 1.6.0+, these java classes have most if not all
  of the behaviour of the corresponding Ruby classes

jrjackson_r.rb
  If you absolutely need Ruby Objects then use this variant
  It parses a little bit slower than the above but
  returns Ruby Array and Hash objects

jrjackson_r_sym.rb
  Will give you symbols for hash keys instead of strings