Question

我遇到java jdk1.6.0_17和hibernate的问题。我必须打开一个hibernate会话工厂，但映射文件（mapper-test.jar）由personaly classLoader（URLClassLoader）加载

         File map = new File("/opt/sigeco/infowebrepository/mapper/mapper-test.jar");
   File map1 = new File("/opt/sigeco/infowebrepository/mapper/hibernate3.jar");       
          URL[] urls = new URL[] { map.toURI().toURL(),map1.toURI().toURL()};   
          URLClassLoader loader = new URLClassLoader(urls);
          //test load is ok
          loader.loadClass("it.sigeco.infoweb.dao.app.IcFabb");          
          Configuration configuration=new Configuration();          
          configuration.configure( loader.getResource("hibernate.cfg.xml"));       
          configuration.buildSessionFactory();

问题是：

org.hibernate.MappingException: Resource: it/sigeco/infoweb/dao/app/IcFabb.hbm.xml not found
at org.hibernate.cfg.Configuration.addResource(Configuration.java:479)
at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1465)
at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1433)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1414)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1390)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1325)
at testLoad.main(testLoad.java:32)

hibernate.cfg.xml：

<?xml version="1.0" encoding="UTF-8"?>
  <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
   "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
  <hibernate-configuration>
    <session-factory>
       <property name="dialect">org.hibernate.dialect.SQLServerDialect</property>
       <property name="show_sql">true</property>
       <property name="hibernate.cache.use_query_cache">false</property>
       <property name="hibernate.cache.use_second_level_cache">false</property>
      <property name="hibernate.jdbc.use_scrollable_resultset">true</property>
      <mapping resource="it/sigeco/infoweb/dao/app/IcFabb.hbm.xml"/>        
    </session-factory>
 </hibernate-configuration>

如果使用构建路径加载mapper-test成功，那么mapper-test就可以了。

似乎Configuration在系统类加载器中搜索文件it / sigeco / infoweb / dao / app / IcFabb.hbm.xml而不是在URLClassLoader中，但是如何将配置与Loader连接？

谢谢

Answer 1

我找到了一个解决方案。我创建了一个personaly ClassLoader，MapperClassLoader，它在costructor中扩展了UrlClassLoader：

MapperClassLoader(URL[] urls)
{
        super( urls,MapperClassLoader.class.getClassLoader());
}

其中urls包含jars url。因此，将父加载器设置为系统类加载器。创建MapperClassLoader后，将系统ClassLoader设置为MapperClassLoader

Thread.currentThread().setContextClassLoader( MapperClassLoader.getInstance());

所以mapper-test.jar是可用的。

Personaly类加载器的Hibernate加载映射

1 个答案: