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Currently if a server plug-in cannot obtain list of datasources for some reason, user is not notified about it and he is offered an empty list of datasources. This can happen for instance when the datasource definition file is not parseable. Please consider providing API that would allow to handle such case. Throwing an exception from the getDatasources method seems like a possible option.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss