Jackson 会抛出循环异常吗？
Jackson 是否处理/抛出循环异常，例如当检测到要转换的 java 对象中的循环时，在 json-lib 中抛出 net.sf.json.JSONException: There is a Cycle in the Hierarchy! 异常在 json 中。如果是的话我们该如何处理。
json-lib 中抛出的错误如下
1169 SEVERE: Servlet.service() for servlet JSONControllerServletGZIP threw exception
1170 net.sf.json.JSONException: There is a cycle in the hierarchy!
1171 at net.sf.json.util.CycleDetectionStrategy$StrictCycleDetectionStrategy.handleRepeatedReferenceAsArray(CycleDetectionStra
1172 at net.sf.json.JSONArray._fromCollection(JSONArray.java:749)
1173 at net.sf.json.JSONArray.fromObject(JSONArray.java:165)
1174 at net.sf.json.JSONObject._processValue(JSONObject.java:2132)
1175 at net.sf.json.JSONObject._setInternal(JSONObject.java:2177)
1176 at net.sf.json.JSONObject.setValue(JSONObject.java:1005)
1177 at net.sf.json.JSONObject._fromMap(JSONObject.java:886)
1178 at net.sf.json.JSONObject.fromObject(JSONObject.java:248)
提前致谢。
Does jackson Handles/throws the Cyclic exception like net.sf.json.JSONException: There is a cycle in the hierarchy! thrown in json-lib when it detects the cycle in java object that is to be converted in json. If so how can we handle it.
Error thrown in json-lib is as follow
1169 SEVERE: Servlet.service() for servlet JSONControllerServletGZIP threw exception
1170 net.sf.json.JSONException: There is a cycle in the hierarchy!
1171 at net.sf.json.util.CycleDetectionStrategy$StrictCycleDetectionStrategy.handleRepeatedReferenceAsArray(CycleDetectionStra
1172 at net.sf.json.JSONArray._fromCollection(JSONArray.java:749)
1173 at net.sf.json.JSONArray.fromObject(JSONArray.java:165)
1174 at net.sf.json.JSONObject._processValue(JSONObject.java:2132)
1175 at net.sf.json.JSONObject._setInternal(JSONObject.java:2177)
1176 at net.sf.json.JSONObject.setValue(JSONObject.java:1005)
1177 at net.sf.json.JSONObject._fromMap(JSONObject.java:886)
1178 at net.sf.json.JSONObject.fromObject(JSONObject.java:248)
Thanks in advance.
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您需要 @JsonBackReference 和 @JsonManagedReference。
You want @JsonBackReference and @JsonManagedReference.
不，杰克逊不会跟踪循环实例，除了捕获的自引用的特殊情况。正如所建议的，目前处理此问题的最佳方法是使用注释，至少在您有父/子样式引用的情况下。
No, Jackson does not keep track of cyclic instances, except for special case of self-reference which is caught. As suggested, currently best way to deal with this is by use of annotations, at least in cases where you have parent/child style reference.