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When attempting to connect to an existing, registered Derby connection and the connection fails then an error dialog opens. "Unable to connect. Cannot establish a connection to jdbc:derby://localhost:1527/sample using org.apache.derby.jdbc.ClientDriver (The connection was refused because the database sample was not found.)" Instead of saying (... because the database sample was not found.) it would be more useful to suggest the user to check the Java DB settings in Tools->Java DB Database->Settings... or to make sure another instance of Derby is not running. In my case, the Derby settings were correct but I had another installation of Derby running.
This is a UI change and probably won't fix for 6.0
Created attachment 52336 [details] diff of fix
attached wrong file
NB6.7 was released already - http://www.netbeans.org/community/releases/67/ Postpone fixing this issue on the next release.
Reassigned to new owner.
It's obsolete bug since UI in NB6.5 was changed.