The official JDK, rather than OpenJDK, has been released as jdkPortable: https://portableapps.com/apps/utilities/jdkportable
Description: OpenJDK (Open Java Development Kit) is a free and open source implementation of the Java programming language.
Note: This took almost 2 hours to compile successfully, 15 or so compile tries, and two weeks to figure out what went wrong each time. Woo!
Download OpenJDK Portable 7 Update 9 b02 Development Test 2 [62.6MB download / 159.0MB installed]
Development Test 1 (2012-11-23):
- Initial Release