I'm currently working on an upgrade of the Grails BlazeDS 4 Integration Plugin from Sebastien Arbogast and Burt Beckwith. I'm going to upgrade it to Spring BlazeDS Integration 1.5.0.RELEASE and Grails 1.3.7.
When using the latest flex-rds-server.jar from the BlazeDS release, the Java Introspector doesn't work because it is unaware of groovy.lang.MetaClass used for the Grails Domain Objects.
I would like to "patch" the classes in the flex-rds-server.jar but I can't find the sources. Aren't they available? Could you provide me with the sources?
I had this very same question one week ago. After a long google search session without answers I posted a note in the stack overflow forum (http://stackoverflow.com/questions/8290982/flex-rds-server-license).
As far as I could figure out this jar is part of Flash Builder IDE. It's binary cames compiled with BlazeDS but it's not part of BlazeDS. I think it's not open source at all.
You do only need it in developing time - I saw some hints on internet saying to remove it when going to production to avoid security issues.
I hope it helps.