Using JDK6 versions through Update 3, we've had issues running the JDeveloper 11g IDE under JDK6 due to incompatibilities with JAXB libraries. I've been testing internal JDeveloper 11g builds using the just-released JDK6 Update 4 (http://java.sun.com/javase/downloads/index.jsp) and this issue appears to be solved. If you want to help test the JDeveloper 11g Technology Preview 3 release using JDK6 Update 4, let us know any problems you encounter over in the 11g Tech Preview Discussion Forum
This mention of course does not constitute any kind of formal or official certification of JDeveloper 11g Tech Preview 3 or OC4J 11g Tech Preview 3 using this JDK6 Update 4 just yet, and your mileage may vary, however it does seem to be working well enough in my testing to encourage you to try it and let us know what (if any) issues you find in your testing.
To change the JDK Home used by JDeveloper 11g Tech Preview 3, you can edit the <JDEVHOME>/jdev/bin/jdev.conf file to add/change the line:
SetJavaHome PathToJDK
For example, on my Linux box I have added a line to that file like:
SetJavaHome /home/smuench/jdk6_04
2:27:05 PM 
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