java.lang.ClassNotFoundException:org.hibernate.HibernateException

Question

我正在运行一个带有hibernate的Web应用程序,并且遇到了这个异常.有什么帮助吗？

抛出java.lang.ClassNotFoundException:org.hibernate.HibernateException在org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)在org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)在com.forum.dao.TopicDAO.findAll(TopicDAO.java:43)在com.forum.servlets.Accueil.doGet(Accueil.java:23)在javax.servlet.http.HttpServlet.service(HttpServlet.java:621)在javax.servlet.http.HttpServlet.service(HttpServlet.java:728)在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)在org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain的.java:210)在org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)在org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)在org.apache.catalina. authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostVal)ve.java:171)在org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)在org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)在org.apache.catalina .core.StandardEngineValve.invoke(StandardEngineValve.java:118)在org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)在org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1008 )atg.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process(AbstractProtocol.java:589)位于java.util.concurrent的org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run(JIoEndpoint.java:312). java.lang.Thread.run上的java.util.concurrent.ThreadPoolExecutor $ Worker.run(未知来源)中的ThreadPoolExecutor.runWorker(未知来源)(未知来源)

这是TopicDAO.findALL()

public static List<Topic> findAll() {

    Session  s = HibernateUtils.getSession(); //TopicDAO.java:43
    Transaction tx = s.beginTransaction();
    List<Topic> objects = null;

    Query q = s.createQuery("from Topic");
    objects = q.list();
    tx.commit();

    return objects;
}

而且,这是我的servlet.doGet()

public void doGet( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException {
    HttpSession session = request.getSession();

    TopicDAO td = new TopicDAO();
    List<Topic> listTopics = td.findAll();

    session.setAttribute( ATT_LIST_TOPICS, listTopics );

    this.getServletContext().getRequestDispatcher( ACCUEIL ).forward( request, response );
}

这是我添加的Hibernate库:

Answer 1

说明:

• ClassDefNotFound异常意味着您的程序无法从引用的库中找到所需的.class文件.

• 在您的情况下,hibernateX.jar文件未打包在war文件中.

• 您需要做的是将其添加到WEB-INF/libwar文件的文件夹中.

解决方案(使用IntelliJ):

1. 开放项目结构

2. 从左侧选项中选择工件

3. 从OutputLayout选项卡中的war文件浏览到 WEB-INF/lib

4. 将包含hibernateX.jar的库添加到该文件夹​​中

5. 重新部署您的项目.

解决方案(使用Eclipse):

1. 只需将罐子拖放到 WEB-INF/lib