JavaLens
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Small example on using Lens from Java.

Without Lens, modifying a deep nested immutable structure is inconvenient,
but with Lens it becomes quite easy.

See
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javalens.logic.UpdateTest for using basic lens
javalens.logic.MapLensTest for using lens for maps
javalens.logic.ComposedMapLensTest for combining various lens to access deep structures

Notes
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Now using lombok to generate DTO accessors, etc. When using maven, lombok is automatically used.
Lombok setup for your IDE:
* Eclipse   -> Go to http://projectlombok.org/ then download and execute the jar file
* Idea      -> Install lombok plugin

Todo
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* MapLens creates a new HashMap on return. It would be nicer to use pcollections' persistent maps
  for efficient differential updates.