fastjson 对象转json string 解决循环引用报错（溢出）

Question

对象是通过hibernate 查询的一对一双向关系的对象：

解析代码：

Employee e = employeeService.findOne(2);
        System.out.println(e);

        String str = JSON.toJSONString(e, SerializerFeature.DisableCircularReferenceDetect);
        System.out.println(str);

报错：

java.lang.StackOverflowError
	at com.alibaba.fastjson.serializer.SerializerFeature.isEnabled(SerializerFeature.java:148)
	at com.alibaba.fastjson.serializer.SerializeWriter.isEnabled(SerializeWriter.java:130)
	at com.alibaba.fastjson.serializer.JSONSerializer.isEnabled(JSONSerializer.java:335)
	at com.alibaba.fastjson.serializer.JavaBeanSerializer.isWriteAsArray(JavaBeanSerializer.java:293)
	at Serializer_2.write1(Unknown Source)
	at Serializer_2.write(Unknown Source)
	at com.alibaba.fastjson.serializer.JSONSerializer.writeWithFieldName(JSONSerializer.java:403)
	at Serializer_1.write1(Unknown Source)
	at Serializer_1.write(Unknown Source)
	at com.alibaba.fastjson.serializer.JSONSerializer.writeWithFieldName(JSONSerializer.java:403)
	at Serializer_2.write1(Unknown Source)
	at Serializer_2.write(Unknown Source)
	at com.alibaba.fastjson.serializer.JSONSerializer.writeWithFieldName(JSONSerializer.java:403)
	at Serializer_1.write1(Unknown Source)
	at Serializer_1.write(Unknown Source)
	at com.alibaba.fastjson.serializer.JSONSerializer.writeWithFieldName(JSONSerializer.java:403)
	at Serializer_2.write1(Unknown Source)
	at Serializer_2.write(Unknown Source)
	at com.alibaba.fastjson.serializer.JSONSerializer.writeWithFieldName(JSONSerializer.java:403)
	at Serializer_1.write1(Unknown Source)

请问如何解决这类问题？