Back in 2007, the following thread was answered as:
we don’t support this. MyEclipse deployment runs on the paradigm that EARs can only contain JARs of classes that need to be exposed on the classpath to the modules contained in the EAR, I don’t blieve (in EE 5) there is a directory in an EAR structure that can accept exploded classes.
(http://www.myeclipseide.com/index.php?name=PNphpBB2&file=posting&mode=newtopic&f=25)
I wonder if this has changed since?
The thing is that during development, starting and stopping the server (weblogic) on each change of classes within the shared JAR is very problematic.
BR,
Avner Cohen