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1. Target Unreachable when Access a composite key from JSF    stackoverflow.com

Inside my JSF I did 

<h:outputLabel value="Group:" for="group" />
<h:inputText id="group" value="#{newUserController.group.groupKey.groupId}" title="Group Id" />
Group.java 
@Entity
public class Group {

    @EmbeddedId
    private GroupKey groupKey;

    @ManyToOne
 ...