XStream with Dom4J driver fail to handle self object reference

marshal object with follow member create wrong reference attribute in xml file
wrong xml output only occurs if dom4j driver is used.

class BadSelfReference implements Serializable {
private static final long serialVersionUID = 38772160335615698L;
private BadSelfReference owner = this;
private String aString = "1234";
private Long aLong = new Long(500);
// getter setter omitted
}

output
<testcase.BadSelfReference>
<owner reference=".."/>
<aString reference="..">1234</aString>
<aLong>500</aLong>
</testcase.BadSelfReference>

how ever, the following class can marshal correctly

class GoodSelfReference implements Serializable {
private static final long serialVersionUID = 38772160335615698L;
private String aString = "1234";
private Long aLong = new Long(500);
private GoodSelfReference owner = this;
// getter setter omitted
}

output

<testcase.GoodSelfReference>
<aString>1234</aString>
<aLong>500</aLong>
<owner reference=".."/>
</testcase.GoodSelfReference>