Closures (Lambda Expressions) for the Java Programming Language
Closures for Java "BGGA" project (by Gilad Bracha, Neal Gafter, James Gosling, and Peter von der Ahé)
Oracle-sponsored JSR 335 (to add lambda expressions to the Java programming language)
Oracle-sponsored Openjdk Project Lambda (to implement jsr 335)
Closures for Java draft specification (by Neal Gafter and Peter von der Ahé)
Java Closures Tutorial from Zdenĕk Troníček
Some explanations (issues related to the BGGA specification):
Closures for Java by Neal Gafter is licensed under a Creative Commons Attribution-Share Alike 3.0 United States License.