I think we should drop support for running Oak 1.3.x on Java 6. At least the Oracle JDK 6 version is not supported anymore and does not receive any security updates. We could still restrict Oak to the Java 6 language level and runtime library features to make sure we can backport fixes. E.g. Apache Sling is using the animal sniffer tool to check compatibility with earlier Java versions.
+1 Michael
