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[build 050621] Steps: 1) start App server from NB 2) expand Sun App server -> Applications -> Enterprise Applications nodes 3) here is visible node with name _JWSappclients, this app isn't visible from web admin console. I guess that it's some admin application that couldn't be visible in Runtime tab.
which app server were you connected to? I have to assume that you connected to an AS 9.0/glassfish instance. The work-around is to not connect to one of these instances. Is 4.2 supposed to support AS 9.0/glassfish?
I used NB build milestone 3 for JavaOne and App server 9.0. I think that this build should support Glassfish definitely.
Nitya checked in a fix for this. it appears to have made it into preview 4. http://serverplugins.netbeans.org/servlets/ReadMsg?list=cvs&msgNo=329
[Milestone 4]