I have a picklist and a converter that works Just Fine.  In other words in debug mode I step through and I'm hitting the converter and it's working the way it's converting the string into the DeviceTag object.  But when I submit I get a Validation Error.  No idea why the value being submitted would be invalid.

I have a list of  DeviceTag.java objects I want to move from left to right.  Here is the code:

<rich:pickList value="#{deviceTags.selected}"

  sourceCaption="Select Tags associated with Device"

  addText="Attach to Device" removeText="Remove from Device">

  <f:selectItems value="#{deviceTags.available}" var="_tag"

    itemLabel="#{_tag.tag}" itemValue="#{_tag}" />

  <f:converter binding="#{deviceTagsConverter}" />

</rich:pickList>

Converter:

@Named
public class DeviceTagsConverter implements Converter {

    @PersistenceContext
    EntityManager em;

    @Override
    public DeviceTag getAsObject(FacesContext arg0, UIComponent arg1, String label) {
        DeviceTag t = em.find(DeviceTag.class, label);
        return t;
    }

    @Override
    public String getAsString(FacesContext arg0, UIComponent arg1, Object deviceTag) {
        DeviceTag dt = (DeviceTag) deviceTag;
        String tn = dt.getTag();
        return tn;
    }

}

In response to some things I've found on the net I've done the following:

Made sure everything in the target list is also found in teh source list.

Overrode equals() method and tested it to be sure it's working.

What else can I check?