2008年9月9日

          NonUniqueObjectException

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

          首先看看這個(gè)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 JavaDoc;
          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 JavaDoc identifier;
          19     private final String JavaDoc entityName;
          20
          21     public NonUniqueObjectException(String JavaDoc message, Serializable JavaDoc id, String JavaDoc clazz) {
          22         super(message);
          23         this.entityName = clazz;
          24         this.identifier = id;
          25     }
          26
          27     public NonUniqueObjectException(Serializable JavaDoc id, String JavaDoc clazz) {
          28         this("a different object with the same identifier value was already associated with the session", id, clazz);
          29     }
          30
          31     public Serializable JavaDoc getIdentifier() {
          32         return identifier;
          33     }
          34
          35     public String JavaDoc getMessage() {
          36         return super.getMessage() + ": " +
          37             MessageHelper.infoString(entityName, identifier);
          38     }
          39
          40     public String JavaDoc getEntityName() {
          41         return entityName;
          42     }
          43
          44 }


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

          posted @ 2008-09-25 17:07 bill 閱讀(902) | 評(píng)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(fā) Struts + Hibernate應(yīng)用的時(shí)候,單獨(dú)測(cè)試Hibernate的類沒有問題,但是當(dāng)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(gè)是myeclipse沒有做好嚴(yán)格的測(cè)試。

             網(wǎng)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(234) | 評(píng)論 (0)編輯 收藏

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