Question

这里我在Eclipse Mars中使用JSP和Hibernate创建一个简单的注册表单。当我运行一个jsp页面时，我得到一个例外：

HTTP状态500 - javax.servlet.ServletException： java.lang.NoClassDefFoundError：org / hibernate / Session。

这里我放了必需的文件和目录结构。

1）User.java

package com.nick.mypack;
 public class User {

 private int id;
 private String name,password,email;

 public int getId() {
    return id;
 }
 public void setId(int id) {
    this.id = id;
 }
 public String getName() {
    return name;
 }
 public void setName(String name) {
    this.name = name;
 }
 public String getPassword() {
    return password;
 }
 public void setPassword(String password) {
    this.password = password;
 }
 public String getEmail() {
    return email;
 }
 public void setEmail(String email) {
    this.email = email;
 }

 }

2）UserDao.java

package com.nick.mypack;

import org.hibernate.Session;  
import org.hibernate.Transaction;  
import org.hibernate.cfg.Configuration;  

public class UserDao {  

 public static int register(User u){  
 int i=0;  
 Session session=new Configuration().  
 configure().buildSessionFactory().openSession();  

 Transaction t=session.beginTransaction();  
 t.begin();  

 i=(Integer)session.save(u);  

 t.commit();  
 session.close();  

return i;  
}  
}

3）的index.jsp

<html>
  <form action="register.jsp" method="post">  
  Name:<input type="text" name="name"/><br><br/>  
  Password:<input type="password" name="password"/><br><br/>  
  Email ID:<input type="text" name="email"/><br><br/>  
  <input type="submit" value="register"/>"  

  </form>
</html>

4）register.jsp

<%@page import="com.nick.mypack.UserDao" %>
 <jsp:useBean id="obj" class="com.nick.mypack.User">  
 </jsp:useBean>  
 <jsp:setProperty property="*" name="obj"/>  

<%   
 int i=UserDao.register(obj);  
 if(i>0)  
 out.print("You are successfully registered");  
%>

请帮我解决这个问题。提前谢谢！

Answer 1

好吧，你的错误是：

static void StartClient() { int port = 150; IPAddress ip = IPAddress.Parse("127.0.0.1"); TcpClient client = new TcpClient(); client.Connect(ip, port); // Do something with client. }

这意味着您的容器（Tomcat或您正在使用的任何服务器）无法加载该类。您可能没有正确打包部署。

您需要WEB-INF / lib中的Hibernate jar。它在这里看起来是空的，所以当你的应用程序运行时它们不在类路径上。

Answer 2

确保配置正确

<强>配置

从[here] [1]下载Hibernate 5。
从里面的文件夹中提取必需的jar并将其添加到以下hibernate-release-5.0.7.Final.zip\hibernate-release-5.0.7.Final\lib\required的构建路径中。

确保将以下jar添加到项目路径（这应该位于WebApp的lib文件夹中）：

antlr-2.7.7.jar
commons-dbcp2-2.1.1.jar
dom4j-1.6.1.jar
geronimo-jta_1.1_spec-1.1.1.jar
hibernate-commons-annotations-5.0.1.Final.jar 
hibernate-core-5.0.7.Final.jar
hibernate-jpa-2.1-api-1.0.0.Final.jar
jandex-2.0.0.Final.jar
javassist-3.18.1-GA.jar
javax.servlet.jsp.jstl-api-1.2.1-sources.jar
jboss-logging-3.3.0.Final.jar
sqljdbc4-3.0.jar //or whatever database you use
hibernate-entitymanager-5.0.7.Final

HibernateUtil.java ：

import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {

     private static final SessionFactory sessionFactory = buildSessionFactory();

     private static SessionFactory buildSessionFactory() {
     try {
        // Create the SessionFactory from hibernate.cfg.xml
          return new Configuration().configure().buildSessionFactory();
     }
     catch (Throwable ex) {
       // Make sure you log the exception, as it might be swallowed
      System.err.println("Initial SessionFactory creation failed." + ex);
    throw new ExceptionInInitializerError(ex);
      }
    }

   public static SessionFactory getSessionFactory() {
      return sessionFactory;
   }

   public static void shutdown() {
    // Close caches and connection pools
     getSessionFactory().close();
   }

 }

HTTP状态500 - javax.servlet.ServletException：java.lang.NoClassDefFoundError：org / hibernate / Session

2 个答案: