Currently, we are using IBM VisualAge for Java to program Swing classes for our legacy system. We plan on migrating to Eclipse, but I cannot find a simple way how to. Is there any tool to migrate the VisualAge Java classes repository (.dat file) and visual composition of Swing classes to Eclipse?
Yipes! Wasn't VA obsoleted about 10-15 years ago? Like back when Eclipse was still an IBM product?
I think that there are some plugins for Swing UI editing foe Eclipse, but I don't know details.
As far as support for the VA swing proprietary classes go, I'd check with IBM. That's one of the problems with proprietary classes. There may not be source code available, and whatever support you can get is limited to the vendor.
I used to use Symantec's Visual Café, and it also yanked in proprietary UI support classes. Because I was working on stuff for open-source release, I couldn't tolerate that, so I wrote a script that rewrote the VC-generated code to use pure Java. Ironically, the script was in Perl, not Java, though!
An IDE is no substitute for an Intelligent Developer.