Although there are a ton of groovy intentions that can be used to convert java syntax into idiomatic groovy, there doesn't appear to be a feature to convert a java source file into an idiomatic groovy source file.
Can anyone confirm if that facility exists in intellij idea 11?
i ran across an old issue which seems to suggest that this feature doesnt exist: http://youtrack.jetbrains.com/issue/IDEA-50321
A random interview on dzone (http://groovy.dzone.com/news/dzone-interviews-peter-gromov) mentions that "In IDEA 11, IDEA will be able to convert Groovy code into Java automatically". I haven't seen that either.