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The Matisse menu Add from Palette / Beans / Choose Bean allows to manually enter a class name that will be used to instantiate a bean inside a form. The full qualified name of the class is asked by means of a free text dialog. The entered name is not trimmed, so if the user mistakenly adds a leading or a trailing space (it might happens e.g. if the name is cut and pasted) an error message about the class not being present or not being suitable to the operation appears. This bug is very subtle as it might happens that a long time is needed to realize that there's just a trailing space. PS Of course, having a class browser with autocompletion, such as the one in "Navigate / Go to Type", would be even better.
Reassigning to "form" for evaluation.
Fixed - I agree that it is a minor issue, but it can be very confusing when it happens (e.g. when someone types some white space accidentaly into Choose Bean dialog). Modified file: http://hg.netbeans.org/main?cmd=changeset;node=d0f2aa487b2b