三天時間小項目完畢,從去年十月中旬到現(xiàn)在開始學習后端技術(shù),Java,Jsp,Servlet,再到后來的Struts2,hibernate,直到最終做出來小項目。理解了MVC分層思想,功能模塊化編程,前端部分還沒有深入學習。有學習后端技術(shù)的小伙伴可加qq 871885998交流~
2017-02-21
ERROR: HHH000099: an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session): java.lang.ClassNotFoundException: entity.students
org.hibernate.cfg.beanvalidation.IntegrationException: Error activating Bean Validation integration
誰幫忙解決下,謝謝!
org.hibernate.cfg.beanvalidation.IntegrationException: Error activating Bean Validation integration
誰幫忙解決下,謝謝!
2017-02-18
// 獲取 Hibernate 配置信息
Configuration config = new Configuration().configure();
// 根據(jù) configuration 建立 sessionFactory
sessionFactory = config.buildSessionFactory();
// 開啟 session(相當于開啟 JDBC 的 connection)
session = sessionFactory.openSession();
Configuration config = new Configuration().configure();
// 根據(jù) configuration 建立 sessionFactory
sessionFactory = config.buildSessionFactory();
// 開啟 session(相當于開啟 JDBC 的 connection)
session = sessionFactory.openSession();
2017-02-17
創(chuàng)建SchemaExport的對象
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().configure().build();
MetadataImplementor metadata = (MetadataImplementor) new MetadataSources(serviceRegistry).buildMetadata();
new SchemaExport().create(EnumSet.of(TargetType.DATABASE), metadata);
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().configure().build();
MetadataImplementor metadata = (MetadataImplementor) new MetadataSources(serviceRegistry).buildMetadata();
new SchemaExport().create(EnumSet.of(TargetType.DATABASE), metadata);
2017-02-17
空指針異常的原因是你們忘記在logout這個方法添加注解@skipValidation,如果不添加這個注解,那么你在login_success的頁面登出的時候也會進行validate()這個方法,顯然這個步驟我們是沒有傳user實例進去的,所以酒報了空指針的異常
2017-02-17