It looks to me like the EntityConverter isn't being used.
Can you get the example multiple-select to work? Can you try and strip down your facelet
to a minimum, check it still won't work, and post it? Are you using myfaces? If so
what version, as I can't spot where that error mesage comes from (I'm assuming
that the error comes from h:messages, do you have showDetail turned on?)?
My converter throws a javax.faces.convert.ConverterException if something goes wrong, JSF
then catches that and adds a FacesMessage. In eclipse you can add a breakpoint if a
ConverterException is thrown and find out where this problem is originating.
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