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1. Rightclick "Java DB" node and choose "Create Database...". 2. In appeared "Create Java DB Database" type DB name. Result: Warning message about recommendation to specify user name and password appears, but it is too imperceptible.
Created attachment 72396 [details] Screenshot of a dialog with imperceptible warning message.
The reason why the message is not a warning is because it's not required to create a Java DB database with a username and password. This is not a bug