On my dev machine I compile SPARK using JDK 7.
The build.xml is ready to compile SPARK with JDK 7 and also, the resulted .jar packets are compatible with JDK 6, so there are no issues here. (we use -target=1.6 and -source=1.6)
I am mostly using development builds and I am not familiar with what install.4j does to create installers in BAMBOO, but I do think that we should switch to JDK 7 also in BAMBOO, to make sure SPARK is compiled and packaged with JDK 7. I am recommending this because there is at least one memory leak fix in JDK 7 that affects spark (http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6542440)
