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In second step of add server gf v3 wizard you can download glassfish. Specify destination directory and press download v3. During installation there is error message "/home/radim/gf3 is not valid V3 install." After installation is finished it disappear but I'm quite sure this message should not be there.
did this get fixed by recent changes?
Yes, I think it did.
I suppose so. But i cannot verified it because URL of build that plugin is trying to download is not valid. There is no glassfish-v3-preview2-final.zip file on http://download.java.net/javaee5/v3/releases/preview/.