NonUniqueObjectException

org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session

首先看看這個類：
//$Id: NonUniqueObjectException.java,v 1.4 2005/02/12 07:19:50 steveebersole Exp $
2 package org.hibernate;
3
4 import java.io.Serializable ;
5
6 import org.hibernate.pretty.MessageHelper;
7
8 /**
9  * This exception is thrown when an operation would
10  * break session-scoped identity. This occurs if the
11  * user tries to associate two different instances of
12  * the same Java class with a particular identifier,
13  * in the scope of a single <tt>Session</tt>.
14  *
15  * @author Gavin King
16  */
17 public class NonUniqueObjectException extends HibernateException {
18     private final Serializable identifier;
19     private final String entityName;
20
21     public NonUniqueObjectException(String message, Serializable id, String clazz) {
22         super(message);
23         this.entityName = clazz;
24         this.identifier = id;
25     }
26
27     public NonUniqueObjectException(Serializable id, String clazz) {
28         this("a different object with the same identifier value was already associated with the session", id, clazz);
29     }
30
31     public Serializable getIdentifier() {
32         return identifier;
33     }
34
35     public String getMessage() {
36         return super.getMessage() + ": " +
37             MessageHelper.infoString(entityName, identifier);
38     }
39
40     public String getEntityName() {
41         return entityName;
42     }
43
44 }


解決方案：
     this..getSession().clear();

posted @ 2008-09-25 17:07 bill 閱讀(896) | 評論 (0) | 編輯 收藏

SSH整合中的問題

Error Creating SessionFactory java.lang.SecurityException: class"org.apache.commons.collections.SequencedHashMap"'異常的解決方案

本人用 MyEclipse 6.0.0 開發 Struts + Hibernate應用的時候，單獨測試Hibernate的類沒有問題，但是當Web層和Struts整合后，就拋出如下異常：
%%%%Error Creating SessionFactory %%%% java.lang.SecurityException: class"org.apache.commons.collections.SequencedHashMap"'s signer informationdoes not match signer information of other classes in the same package

   原因是myeclipse  6.0的jar包問題。這個是myeclipse沒有做好嚴格的測試。

   網上好多人說是commons-collectionsXXX.jar的問題。我也不知道。我是把所有的myeclipse生成的jar都remove buildpath 了。
   我又自己添加的jar。就OK！！！！

posted @ 2008-09-09 21:36 bill 閱讀(230) | 評論 (0) | 編輯 收藏