We've published on our company's blog an interesting post titled :
Around the web there are some java to actionscript converter (such as J2AS) but they don't work with Java 6 data types and with Eclipse 3.2.
For a project we're working on we developed a simple Java class that converts from Java Beans to Actionscript 3 classes for working with LiveCycle Data Services.
We think to create an Ant script or an Eclipse Plugin and put it into the osflash repository.
Great job Constantine ! :)