Hi, I've just uploaded a very simple web app that uses hibernate via a war file to my webserver:
http://www.colin-java.co.uk/BANK The first couple of times I loaded the page above, it was fine, and it correctly displayed some of the contents of the User (MySQL) table.
But now when I load it, I get this error...
Code:
HTTP Status 500 -
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /index.jsp at line 25
null
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
sun.reflect.GeneratedMethodAccessor6469.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:269)
java.security.AccessController.doPrivileged(Native Method)
javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:301)
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162)
root cause
java.lang.NullPointerException
org.apache.jsp.index_jsp._jspService(index_jsp.java:77)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
sun.reflect.GeneratedMethodAccessor6469.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:269)
java.security.AccessController.doPrivileged(Native Method)
javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:301)
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162)
The index.jsp page is shown below:
Code:
<%@page import="bank.User"%>
<%@page import="java.util.List"%>
<%@page import="bank.BankHelper"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>Hello World!</h1>
<%
BankHelper helper = new BankHelper();
List<User> users = helper.getUsers();
for(User user : users) // ********** LINE 25 ************
{
out.println("user is "+user.getSurname()+"<BR>");
}
%>
</body>
</html>
So it appears that 'users' on line 23 is null.
If I display the BankHelper class to look at the getUsers method,
perhaps this is the problem...
Code:
package bank;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
public class BankHelper
{
Session session = null;
public BankHelper()
{
this.session = HibernateUtil.getSessionFactory().getCurrentSession();
}
public List<User> getUsers()
{
List<User> users = null;
try
{
org.hibernate.Transaction tx = session.beginTransaction();
Query q = session.createQuery("from User as user");
users = q.list();
}
catch (Exception e)
{
e.printStackTrace();
}
return users;
}
}
Can anyone help figure out what I'm doing wrong, I don't like it when things work first time, but not after.
Any help is much appreciated. Thanks
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