[JBoss] Unique constraint not created in JPA

I have created the following entity bean, and specified two columns as being unique. Now my problem is that the table is created without the unique constraint, and no errors in the log. Does anyone have an idea?

@Entity
@Table(name = "cm_blockList", uniqueConstraints = @UniqueConstraint(columnNames = {"terminal", "blockType"}))
public class BlockList {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
@ManyToOne(cascade = CascadeType.PERSIST)
@JoinColumn(name="terminal")
private Terminal terminal;
@Enumerated(EnumType.STRING)
private BlockType blockType;
private String regEx;
}

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