I'll switch the trunk build to JDK7 unless objection next week. It'll break tests. Jimmy Xiang figured this a while ago and he filed https://issues.apache.org/jira/browse/HBASE-6182. He also started fixing some of the breakage. Lets help him out.
Some reasons to favor JDK7 are JDK6 is being EOL'd soon and JDK7 reportedly improves performance by noticeably percentages. St.Ack
