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因为项目中使用了Extjs技术，JAR包为：json-lib.jar， 在开发过程中遇到了一个JSON-LIB和Hibernate有关的问题：
net.sf.json.JSONException: There is a cycle in the hierarchy!
at net.sf.json.util.CycleDetectionStrategy$StrictCycleDetectionStrategy.handleRepeatedReferenceAsObject(CycleDetectionStrategy.java:97)
at net.sf.json.JSONObject._fromBean(JSONObject.java:857)
at net.sf.json.JSONObject.fromObject(JSONObject.java:192)
at net.sf.json.JSONObject._processValue(JSONObject.java:2774)
at net.sf.json.JSONObject._setInternal(JSONObject.java:2798)
at net.sf.json.JSONObject.setValue(JSONObject.java:1507)
at net.sf.json.JSONObject._fromBean(JSONObject.java:940)
at net.sf.json.JSONObject.fromObject(JSONObject.java:192)
at net.sf.json.JSONObject._processValue(JSONObject.java:2774)
at net.sf.json.JSONObject._setInternal(JSONObject.java:2798)
at net.sf.json.JSONObject.setValue(JSONObject.java:1507)
at net.sf.json.JSONObject._fromBean(JSONObject.java:940)
at net.sf.json.JSONObject.fromObject(JSONObject.java:192)
at net.sf.json.JSONObject._processValue(JSONObject.java:2774)
at net.sf.json.JSONObject._setInternal(JSONObject.java:2798)
at net.sf.json.JSONObject.setValue(JSONObject.java:1507)
at net.sf.json.JSONObject._fromBean(JSONObject.java:940)
at net.sf.json.JSONObject.fromObject(JSONObject.java:192)
at net.sf.json.JSONObject._processValue(JSONObject.java:2774)
at net.sf.json.JSONObject._setInternal(JSONObject.java:2798)
at net.sf.json.JSONObject.setValue(JSONObject.java:1507)
at net.sf.json.JSONObject._fromBean(JSONObject.java:940)
at net.sf.json.JSONObject.fromObject(JSONObject.java:192)
at net.yanhl.iouser.action.IOUserAction.loadUser(IOUserAction.java:142)
因为Hibernate中设置了自身关联：
//设置自身关联的组对象
public classUser implements Serializable {
private static final long serialVersionUID = 6202253180943473205L;
@ManyToMany(targetEntity = Role.class,fetch = FetchType.EAGER)
@JoinTable(name = "user_role",joinColumns = @JoinColumn(name = "user_id"),inverseJoinColumns = @JoinColumn(name = "role_id"))
@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
private Set<Role> roles;
@Transient
private Map<String,List<Resource>> roleResources;
起初想通过hibernate来解决问题，就是想过滤掉自身关联后来查资料发现不可能实现，最后找到通过JSON-LIB来过滤关联的集合属性，代码如下：
JsonConfig config = new JsonConfig();
config.setJsonPropertyFilter(new PropertyFilter(){
public boolean apply(Object source,String name,Object value) {
if(name.equals("roles") || name.equals("roleResources")) {
return true;
} else {
return false;
}
}
});
List<User> list = (List<User>)userManagerImpl.findPaginatedList(user,perpage,current);
JSONArray arr = JSONArray.fromObject(list,config);
当JSON-LIB解析JAVABEAN时过滤掉roles、roleResources这两个属性，重新启动服务，pass （编辑：李大同）
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