用ie8時，請求json,eclipse直接宕機！！！！
除錯時，可以用chrome,看到無限迴圈的報錯。。。類似
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user 與 role 是hibernate的多對多的關係！！！！
jackson中的@jsonbackreference和@jsonmanagedreference，以及@jsonignore均是為了解決物件中存在雙向引用導致的無限遞迴（infinite recursion）問題。這些標註均可用在屬性或對應的get、set方法中。
@jsonbackreference和@jsonmanagedreference：這兩個標註通常配對使用，通常用在父子關係中。@jsonbackreference標註的屬性在序列化（serialization，即將物件轉換為json資料）時，會被忽略（即結果中的json資料不包含該屬性的內容）。@jsonmanagedreference標註的屬性則會被序列化。在序列化時，@jsonbackreference的作用相當於@jsonignore，此時可以沒有@jsonmanagedreference。但在反序列化（deserialization，即json資料轉換為物件）時，如果沒有@jsonmanagedreference，則不會自動注入@jsonbackreference標註的屬性（被忽略的父或子）；如果有@jsonmanagedreference，則會自動注入自動注入@jsonbackreference標註的屬性。
@jsonignore：直接忽略某個屬性，以斷開無限遞迴，序列化或反序列化均忽略。當然如果標註在get、set方法中，則可以分開控制，序列化對應的是get方法，反序列化對應的是set方法。在父子關係中，當反序列化時，@jsonignore不會自動注入被忽略的屬性值（父或子），這是它跟@jsonbackreference和@jsonmanagedreference最大的區別。
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