Hi,my friends.my problem is here.

Question

hi,my problem now is :
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
net.sf.hibernate.examples.quickstart.HibernateUtil.currentSession(HibernateUtil.java:24)
org.apache.jsp.testCat_jsp._jspService(testCat_jsp.java:65)
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)
package net.sf.hibernate.examples.quickstart;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import net.sf.hibernate.*;
import net.sf.hibernate.cfg.*;
public class HibernateUtil {
private static Log log = LogFactory.getLog(HibernateUtil.class);
private static SessionFactory sessionFactory ;
static {
try {
// Create the SessionFactory
sessionFactory = new Configuration().configure().buildSessionFactory();
catch (Throwable ex) {
log.error("Initial SessionFactory creation failed.", ex);
System.out.println(ex.toString());
public static final ThreadLocal session = new ThreadLocal();
public static Session currentSession() throws HibernateException {
Session s = (Session) session.get();
// Open a new Session, if this Thread has none yet
if (s == null) {
s = sessionFactory.openSession();
session.set(s);
return s;
public static void closeSession() throws HibernateException {
Session s = (Session) session.get();
session.set(null);
if (s != null)
s.close();
}

Answer 1

my cat class .
package net.sf.hibernate.examples.quickstart;
public class Cat {
    private String id;
    private String name;
    private char sex;
    private float weight;
     * @return Returns the id.
    public String getId() {
        return id;
     * @param id The id to set.
    public void setId(String id) {
        this.id = id;
     * @return Returns the name.
    public String getName() {
        return name;
     * @param name The name to set.
    public void setName(String name) {
        this.name = name;
     * @return Returns the sex.
    public char getSex() {
        return sex;
     * @param sex The sex to set.
    public void setSex(char sex) {
        this.sex = sex;
     * @return Returns the weight.
    public float getWeight() {
        return weight;
     * @param weight The weight to set.
    public void setWeight(float weight) {
        this.weight = weight;
}