ClassCastException: HashMap can not be cast to String thrown by Hibernate Envers when persisting self-referencing many-to-many entity in JBoss EAP 5 and 6

Issue

Given an entity like the following:

@Audited
@Entity()
@Table(name = "rh_info_complaint")
public class RHInfoComplaint {

    private Integer id;
    private String originalId;
    private List<RHInfoComplaint> relatedComplaints = new ArrayList<RHInfoComplaint>(1);

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    @Audited(targetAuditMode = RelationTargetAuditMode.NOT_AUDITED)
    @AuditJoinTable(name = "aud_info_complaint_related")
    @Fetch(FetchMode.SELECT)
    @ForeignKey(name = "fk_ic_ic_relcompid")
    @JoinColumn(name = "related_complaint_id")
    @ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    public List<RHInfoComplaint> getRelatedComplaints() {
        return relatedComplaints;
    }

    public void setRelatedComplaints(List<RHInfoComplaint> relatedComplaints) {
        this.relatedComplaints = relatedComplaints;
    }

    @Column(name = "original_id", insertable=true, nullable=false, updatable=true)
    public String getOriginalId() {
        return originalId;
    }

    public void setOriginalId(String originalId) {
        this.originalId = originalId;
    }
}

the following ClassCastException is thrown by Hibernate Envers when attempting to persist a new instance which references another new instance:

java.lang.ClassCastException: java.util.HashMap cannot be cast to java.lang.String

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