johnnylzb http://johnnylzb.javaeye.com UTF-8 Copyright 2003-2008, JavaEye.com http://blogs.law.harvard.edu/tech/rss JavaEye - 做最棒的软件开发交流社区 web.xml如何配置才能让打到jar包的Bean能在容器启动时初始化？ johnnylzb 作者: johnnylzb  链接：http://johnnylzb.javaeye.com/blog/152902  发表时间: 2008年01月03日

声明：本文系JavaEye网站发布的原创博客文章，未经作者书面许可，严禁任何网站转载本文，否则必将追究法律责任！

我做了一个权限组件，打成jar包放到业务系统的lib下，在业务系统的web.xml里面，配置如下：

<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath*:modules/spring.xml;classpath*:modules/daoContext.xml;classpath*:modules/**/spring-conf/*.xml;
</param-value>
</context-param>

<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>

通配符对应的路径是对的，但jar里面的bean并没有在容器启动的时候创建，也无法在运行过程中获取，听说jar包里面的xml文件不能用通配符来定位，请问应该如何设置呢？在网上搜索了很多还是搜索不到解决办法，Spring的Reference也没有解释。
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]]> Thu, 03 Jan 2008 18:11:21 +0800 http://johnnylzb.javaeye.com/blog/152902 http://johnnylzb.javaeye.com/blog/152902 关于Hibernate加载数据时的CGLIB动态代理的奇怪问题。 johnnylzb 作者: johnnylzb  链接：http://johnnylzb.javaeye.com/blog/128215  发表时间: 2007年09月29日

声明：本文系JavaEye网站发布的原创博客文章，未经作者书面许可，严禁任何网站转载本文，否则必将追究法律责任！

有三个类，分别对应三个表ComAuthPermissionDO、ComAuthOperationDO、ComAuthEntityDO

三个表的关系是：ComAuthPermissionDO分别引用了ComAuthOperationDO、ComAuthEntityDO，即分别跟这两个表形成@ManyToOne关系。

在查询ComAuthPermissionDO，可以联级查到ComAuthOperationDO、ComAuthEntityDO，但非常奇怪，我查出来之后，发现ComAuthOperationDO的equals()方法总是返回false，最后发现，是equals方法在对比两个类的Class时候返回false。于是打印了联级查询的这两个实例的Class：

=============.>>CLass:  com.xx.component.authorization.model.ComAuthOperationDO$$EnhancerByCGLIB$$86a21bfb
=============.>>CLass:  com.xx.component.authorization.model.ComAuthEntityDO

为什么Hibernate加载ComAuthOperationDO实例时用来CGLIB动态代理，而加载ComAuthEntityDO时却正常呢？

请解答。。。谢谢！


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]]> Sat, 29 Sep 2007 14:35:15 +0800 http://johnnylzb.javaeye.com/blog/128215 http://johnnylzb.javaeye.com/blog/128215 Hibernate双向关联插入数据时候的怪问题 johnnylzb 作者: johnnylzb  链接：http://johnnylzb.javaeye.com/blog/124658  发表时间: 2007年09月17日

声明：本文系JavaEye网站发布的原创博客文章，未经作者书面许可，严禁任何网站转载本文，否则必将追究法律责任！

简单描述一下表结构：主表Team，从表Player，建立外键关联。

以下是HBM文件：

Team：

xml 代码
  1. <hibernate-mapping>  
  2.     <class name="com.hibernatedemo.model.Team" table="team" catalog="hibernatedemo">  
  3.         <comment></comment>  
  4.         <id name="id" type="string">  
  5.             <column name="id" length="32" />  
  6.             <generator class="assigned" />  
  7.         </id>  
  8.         <property name="name" type="string">  
  9.             <column name="name" length="32" not-null="true">  
  10.                 <comment></comment>  
  11.             </column>  
  12.         </property>  
  13.         <set name="players" inverse="true" cascade="all">  
  14.             <key>  
  15.                 <column name="team" length="32" not-null="true">  
  16.                     <comment></comment>  
  17.                 </column>  
  18.             </key>  
  19.             <one-to-many class="com.hibernatedemo.model.Player" />  
  20.         </set>  
  21.     </class>  
  22. </hibernate-mapping>  



Palyer：

xml 代码
  1. <hibernate-mapping>  
  2.     <class name="com.hibernatedemo.model.Player" table="player" catalog="hibernatedemo">  
  3.         <comment></comment>  
  4.         <id name="id" type="string">  
  5.             <column name="id" length="32" />  
  6.             <generator class="assigned" />  
  7.         </id>  
  8.         <many-to-one name="team" class="com.hibernatedemo.model.Team" fetch="select">  
  9.             <column name="team" length="32" not-null="true">  
  10.                 <comment></comment>  
  11.             </column>  
  12.         </many-to-one>  
  13.         <property name="name" type="string">  
  14.             <column name="name" length="32" not-null="true">  
  15.                 <comment></comment>  
  16.             </column>  
  17.         </property>  
  18.         <property name="gender" type="java.lang.Boolean">  
  19.             <column name="gender">  
  20.                 <comment></comment>  
  21.             </column>  
  22.         </property>  
  23.         <property name="birthday" type="date">  
  24.             <column name="birthday" length="10">  
  25.                 <comment></comment>  
  26.             </column>  
  27.         </property>  
  28.     </class>  
  29. </hibernate-mapping>  

 

插入数据的代码如下：

java 代码
  1. Transaction tx = session.beginTransaction();   
  2.         for(int i=0;i<2;i++) {   
  3.             Team team = new Team();   
  4.             team.setId("Team" + new Integer(i).toString());   
  5.             team.setName(team.getId());   
  6.             Set  players = new HashSet ();   
  7.             for(int j=0;j<10;j++) {   
  8.                 Player player = new Player();   
  9.                 player.setId("Player" + team.getId()+"."+new Integer(j).toString());   
  10.                 player.setName(player.getId());   
  11.                 player.setBirthday(new Date());   
  12.                 player.setGender(true);   
  13.                 player.setTeam(team);   
  14.                 players.add(player);   
  15.             }   
  16.             team.setPlayers(players);   
  17.             session.save(team);   
  18.         }   
  19.         tx.commit();  

 

执行代码，SQL打印如下：

Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: select player_.id, player_.team as team1_, player_.name as name1_, player_.gender as gender1_, player_.birthday as birthday1_ from hibernatedemo.player player_ where player_.id=?
Hibernate: insert into hibernatedemo.team (name, id) values (?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.team (name, id) values (?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)
Hibernate: insert into hibernatedemo.player (team, name, gender, birthday, id) values (?, ?, ?, ?, ?)

 

问题是：为什么在insert语句之前，会执行select语句，对player进行查询呢？请指教


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]]> Mon, 17 Sep 2007 10:22:46 +0800 http://johnnylzb.javaeye.com/blog/124658 http://johnnylzb.javaeye.com/blog/124658 关于常量类使用的一个问题。 johnnylzb 作者: johnnylzb  链接：http://johnnylzb.javaeye.com/blog/41043  发表时间: 2006年12月27日

声明：本文系JavaEye网站发布的原创博客文章，未经作者书面许可，严禁任何网站转载本文，否则必将追究法律责任！

系统有一个常量类，用来保存一些公用的不可变信息，所有常量都被声明为 public static final，但其中一个常量，用于保存系统的绝对路径（WebRoot），这个常量需要在Servlet启动后加载，所以目前就不能把改常量声明为final，但这存在一个非常大的隐患，就是如果某程序员不小心（或恶意）在代码中修改了改常量，将会导致整个系统无法正常运行（因为系统的配置信息文件都保存在该常量指定的路径中）。

这里有两个问题：
1.这种情况，请问有什么比较好的解决方案；

2.对于常量类，他没有公有的构造方法，没有任何静态或非静态方法，只有static成员变量，请问该常量类在内存中会否存在实例，而它的所有成员变量，究竟是在什么时候被实例化到系统的内存当中？是当Web系统被容器加载的时候吗？还是在该常量被第一次调用的时候才延迟加载？
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]]> Wed, 27 Dec 2006 16:37:13 +0800 http://johnnylzb.javaeye.com/blog/41043 http://johnnylzb.javaeye.com/blog/41043