NetBeans 7.4+ supports Lambdas expressions and provides inspections for refactoring of "legacy" Java 7 code :-) (Menu (Source) -> Inspect (JRE 8 Profiles Conformance)):
Thanks Geertjan Wielenga for the screencast!
NEW workshop: Building HTML 5 Applications With Angular 2
Full week in December 2016: from Java EE 7 Bootstrap, Effective, Architectures over Testing to Microservices
On demand workshops: Java EE 7: Bootstrap, Effective, Testing and Microservices available for streaming.