不同的java对象引用相同的内存地址异常解决方案

1、首先数据库查询有四条记录：

查询视图：select * from tav_user_dept_role  where USER_TITLE  = '罗可扬';

返回结果：

那么也就对应了4个不同的对象。

2、实际操作中并非如此，返回了4对对象，但是却都引用了同一个内存地址：

List userInfoList = swfBiz.getTaViewUserDeptRoleList(user);TaViewUserDeptRole taViewUserDeptRole0 = (TaViewUserDeptRole)userInfoList.get(0);                TaViewUserDeptRole taViewUserDeptRole1 = (TaViewUserDeptRole)userInfoList.get(1);                TaViewUserDeptRole taViewUserDeptRole2 = (TaViewUserDeptRole)userInfoList.get(2);                TaViewUserDeptRole taViewUserDeptRole3 = (TaViewUserDeptRole)userInfoList.get(3);                System.out.println("taViewUserDeptRole0--->"+taViewUserDeptRole0+"    taViewUserDeptRole0---->"+taViewUserDeptRole0.getDeptName());                System.out.println("taViewUserDeptRole1--->"+taViewUserDeptRole1+"    taViewUserDeptRole1---->"+taViewUserDeptRole1.getDeptName());                System.out.println("taViewUserDeptRole2--->"+taViewUserDeptRole2+"    taViewUserDeptRole2---->"+taViewUserDeptRole2.getDeptName());                System.out.println("taViewUserDeptRole3--->"+taViewUserDeptRole3+"    taViewUserDeptRole3---->"+taViewUserDeptRole3.getDeptName());

控制台打印结果：

控制台打印输出：taViewUserDeptRole0--->adam.bp.workflow.entity.TaViewUserDeptRole@111ebb3    taViewUserDeptRole0---->江南营业所taViewUserDeptRole1--->adam.bp.workflow.entity.TaViewUserDeptRole@111ebb3    taViewUserDeptRole1---->江南营业所taViewUserDeptRole2--->adam.bp.workflow.entity.TaViewUserDeptRole@111ebb3    taViewUserDeptRole2---->江南营业所taViewUserDeptRole3--->adam.bp.workflow.entity.TaViewUserDeptRole@111ebb3    taViewUserDeptRole3---->江南营业所

四个对象的内存引用均为：adam.bp.workflow.entity.TaViewUserDeptRole@111ebb3。

显然出现了异常情况，但是控制台并没有报出任何异常。

3、发现问题

经过研究发现，问题出在了我的hibernate配置上，在利用hibernate反向生成视图 tav_user_dept_role对应的实体类时，本来是以联合主键的方式生成了两个类：TaViewUserDeptRole 和TaViewUserDeptRoleId。将所有的属性字段都放在了TaViewUserDeptRoleId中，然后通过TaViewUserDeptRole 的属性TaViewUserDeptRoleId调用。

我感觉不爽，直接干掉了。把所有的属性都移到了TaViewUserDeptRole 类中，并指定了一个主键：

配置如下：TaViewUserDeptRole.hbm.xml

<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><!--     Mapping file autogenerated by MyEclipse - Hibernate Tools--><hibernate-mapping>    <class name="adam.bp.workflow.entity.TaViewUserDeptRole" table="TAV_USER_DEPT_ROLE" schema="JMJL">        <id name="userName" type="string">            <column name="USER_NAME" length="21" /><generator class="native"></generator></id>        <property name="userTitle" type="string">            <column name="USER_TITLE" length="30" />        </property>       <property name="deptId" type="string">            <column name="DEPT_ID" length="39" />        </property>        <property name="deptName" type="string">            <column name="DEPT_NAME" length="40" />        </property>        <property name="roleName" type="string">            <column name="ROLE_NAME" length="21" />        </property>        <property name="roleTitle" type="string">            <column name="ROLE_TITLE" length="30" />        </property>    </class></hibernate-mapping>

这样的修改便是导致问题的原因了！

4、解决问题

通过hibernate反向重新生成实体类：TaViewUserDeptRole_new和TaViewUserDeptRole_newId。

如下配置TaViewUserDeptRole_new.hbm.xml：

<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><!--     Mapping file autogenerated by MyEclipse - Hibernate Tools--><hibernate-mapping>    <class name="adam.bp.workflow.entity.TaViewUserDeptRole_new" table="TAV_USER_DEPT_ROLE" schema="JMJL">        <composite-id name="id" class="adam.bp.workflow.entity.TaViewUserDeptRole_newId">            <key-property name="userName" type="string">                <column name="USER_NAME" length="21" />            </key-property>            <key-property name="userTitle" type="string">                <column name="USER_TITLE" length="30" />            </key-property>            <key-property name="deptId" type="string">                <column name="DEPT_ID" length="39" />            </key-property>            <key-property name="deptName" type="string">                <column name="DEPT_NAME" length="40" />            </key-property>            <key-property name="roleName" type="string">                <column name="ROLE_NAME" length="21" />            </key-property>            <key-property name="roleTitle" type="string">                <column name="ROLE_TITLE" length="30" />            </key-property>        </composite-id>    </class></hibernate-mapping>

重新查找：

List userInfoList = swfBiz.getTaViewUserDeptRole_newList(user);TaViewUserDeptRole_new taViewUserDeptRole0 = (TaViewUserDeptRole_new)userInfoList.get(0);                TaViewUserDeptRole_new taViewUserDeptRole1 = (TaViewUserDeptRole_new)userInfoList.get(1);                TaViewUserDeptRole_new taViewUserDeptRole2 = (TaViewUserDeptRole_new)userInfoList.get(2);                TaViewUserDeptRole_new taViewUserDeptRole3 = (TaViewUserDeptRole_new)userInfoList.get(3);                System.out.println("taViewUserDeptRole0--->"+taViewUserDeptRole0+"    taViewUserDeptRole0---->"+taViewUserDeptRole0.getId().getDeptName());                System.out.println("taViewUserDeptRole1--->"+taViewUserDeptRole1+"    taViewUserDeptRole1---->"+taViewUserDeptRole1.getId().getDeptName());                System.out.println("taViewUserDeptRole2--->"+taViewUserDeptRole2+"    taViewUserDeptRole2---->"+taViewUserDeptRole2.getId().getDeptName());                System.out.println("taViewUserDeptRole3--->"+taViewUserDeptRole3+"    taViewUserDeptRole3---->"+taViewUserDeptRole3.getId().getDeptName());

控制台打印输出：

taViewUserDeptRole0--->adam.bp.workflow.entity.TaViewUserDeptRole_new@38f07b    taViewUserDeptRole0---->江南营业所taViewUserDeptRole1--->adam.bp.workflow.entity.TaViewUserDeptRole_new@3459ed    taViewUserDeptRole1---->江南营业所taViewUserDeptRole2--->adam.bp.workflow.entity.TaViewUserDeptRole_new@fbef54    taViewUserDeptRole2---->恩平供电局taViewUserDeptRole3--->adam.bp.workflow.entity.TaViewUserDeptRole_new@1d9313    taViewUserDeptRole3---->恩平供电局

显然这样输出的不同对象在内存中也是引用不同的地址了。