Digester 问题

Question

Digester digester = new Digester();
        digester.setValidating( false );
        //生成本类实例
        digester.addObjectCreate( "quasar_module/action_mappings", ModuleDig.class);
        //生成module_info实例
        digester.addObjectCreate("quasar_module/action_mappings/action",ActionMapping.class);
        //获取属性值，并将其存入ActionMapping实例
        digester.addSetProperties("quasar_module/action_mappings/action");
        digester.addSetNext("quasar_module/action_mappings/action","readActionMapping");
        try{
            FileReader fr = new FileReader("E:/struts/module.xml");
            digester.parse(fr);
            fr.close();
        }catch(Exception e){
            e.printStackTrace();
        }