You can compile and run against 1.4, but the Designer has a number of issues with 1.4, because JBuilder itself runs on a 1.3 VM. One of them is that if your classes use the new logging API's (or any other new java.* packages, I suspect), the 1.3 VM will throw a security exception, because you aren't allowed to load new classes under the java.* hierarchy.

You might be able to fix it using the proxy class technique described in the release notes under "Red Beans," but I suspect that you'll need to temporarily remove any references to the logging package if you want the Designer to run.

You could also try temporarily changing JBuilder's own VM to 1.4, but that causes other problems (especially with the debugger) that are probably worse.
2002-Apr-03 9:30am gyles19@visi.com