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I try to install NetBeans (Web && Java EE) without bundled Tomcat and Glassfish, but it is impossible. You have to at least select on server to install. Right now I can not reproduce it, but few hours early, I have just installed NB without those servers.
Created attachment 59146 [details] Installer print screen
Actually this occurs if you have already NetBeans 6.1 Beta installed (at least, including Base IDE, Java SE, Web & Java EE packs) and run it again. I realize that the error message shoud be clear in such a case to explain the situation.
Yes, you have right, I have checked it and it is exactly as you mentioned. The error message made me embarrass ;-)
*** Issue 136669 has been marked as a duplicate of this issue. ***
Fixed: http://hg.netbeans.org/main/rev/b77e09ddce63
Integrated into 'main-golden', will be available in build *200905070201* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/b77e09ddce63 User: Yulia Novozhilova <ynov@netbeans.org> Log: Fix #131201: Unclear error is shown on Welcome panel (JavaEE) if NetBeans is already installed