reallllllly needs help :(:(:(

**sarahd19** · 01-22-2010, 04:29 PM

So for my college assignment i've been asked to create a Website with some JSP, i got the login and create a user to work and edit the users details.
BUT NOW ive hit a problem such a silly one too!!!

Basically i am creating like a Ticketmaster type website which has users (obv)
and one administrator this administrator is allowed create the events on this website problem is i wont work ive been struggling with this problem for over a week i need someone elses view on it.

The Adminstrator creates an event , in turn that gets sent to a createEventEntry.jsp which creates it if all is fine it should go to the displayEvent.jsp which will display the contents i just created easy huh? well i cant seem to fix the problem id be sooooooooooooo grateful to anyone who can help because i cannot move on with the programming until this is fixed!

User adds in details on form gets sent to this page:

createEventEntry.jsp

<%
EventEntry e;
Model m;
String ttl, txt, img;
int i;

m = (Model) application.getAttribute("model");
if (m == null) {
m = new Model();
application.setAttribute("model", m);
}

ttl = request.getParameter("title");
txt = request.getParameter("text");
img = request.getParameter("imageName");

m.addEventEntry(ttl, txt, img);
i = m.getNumEntries()-1;
request.setAttribute("index",new Integer(i));

%>
<jsp:forward page="EventsPage.jsp" />

Which is then forwarded to this

EventsPage
<%
User usr;
Model m;
EventEntry e;
int i;

i = ((Integer)request.getAttribute("index")).intValue( );

m = (Model)session.getAttribute("Model");
usr = (User)session.getAttribute("user");
e = m.getEventEntry(i);

%>

<html>

Entry Date:<%= e.getDateCreated()%>


Entry Date:<%= e.getImageName()%>

 

Entry Title:<%= e.getTitle()%>

 

Entry Text:
 
 
<%= e.getText()%>

</html>

Error Im Getting

org.apache.jasper.JasperException: An exception occurred processing JSP page /createEventEntry.jsp at line 32

29:
30:
31: %>
32: <jsp:forward page="EventsPage.jsp" />

Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handle JspException(JspServletWrapper.java:505)
org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:398)
org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
org.netbeans.modules.web.monitor.server.MonitorFil ter.doFilter(MonitorFilter.java:390)

root cause

org.apache.jasper.JasperException: An exception occurred processing JSP page /EventsPage.jsp at line 18

15:
16: m = (Model)session.getAttribute("Model");
17: usr = (User)session.getAttribute("user");
18: e = m.getEventEntry(i);
19:
20: %>
21: <html>

Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handle JspException(JspServletWrapper.java:505)
org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:416)
org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
org.netbeans.modules.web.monitor.server.MonitorFil ter.doFilter(MonitorFilter.java:390)
org.apache.jasper.runtime.PageContextImpl.doForwar d(PageContextImpl.java:696)
org.apache.jasper.runtime.PageContextImpl.forward( PageContextImpl.java:667)
org.apache.jsp.createEventEntry_jsp._jspService(cr eateEventEntry_jsp.java:87)
org.apache.jasper.runtime.HttpJspBase.service(Http JspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
org.netbeans.modules.web.monitor.server.MonitorFil ter.doFilter(MonitorFilter.java:390)

root cause

java.lang.NullPointerException
org.apache.jsp.EventsPage_jsp._jspService(EventsPa ge_jsp.java:71)
org.apache.jasper.runtime.HttpJspBase.service(Http JspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
org.netbeans.modules.web.monitor.server.MonitorFil ter.doFilter(MonitorFilter.java:390)
org.apache.jasper.runtime.PageContextImpl.doForwar d(PageContextImpl.java:696)
org.apache.jasper.runtime.PageContextImpl.forward( PageContextImpl.java:667)
org.apache.jsp.createEventEntry_jsp._jspService(cr eateEventEntry_jsp.java:87)
org.apache.jasper.runtime.HttpJspBase.service(Http JspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
org.netbeans.modules.web.monitor.server.MonitorFil ter.doFilter(MonitorFilter.java:390)

**travishein** · 01-22-2010, 04:41 PM

in this case, it looks like the model attribute is not set on the session attributes, and that is causing the null pointer exception, maybe try:

Java Code:

if (m != null) {
  e = m.getEventEntry(i);
}

**sarahd19** · 01-22-2010, 06:33 PM

Nope didnt work :/

i dont understand it , it really should it looks right!

**sarahd19** · 01-22-2010, 06:49 PM

would i have to go about getting the attributes a different way because its an
ArrayList it was my first time using them?

This is my model class that im supposed to be getting the information from:

package WebAppCA3v2;
import java.util.*;

public class Model
{
private User[] users;
private int numUsers;
private ArrayList<EventEntry> eventEntries = new ArrayList();

public Model() {
User u;

users = new User[ 10000 ];
numUsers = 0;
u = addUser("john","john","john@work.ie","secret","dun laoghaire","ireland","D12","123456");
u.setAdmin(true);

addEventEntry("My First Event", "My First event", "images/pic4.jpg");
addEventEntry("My First Event", "My First event", "images/pic3.jpg");
addEventEntry("My First Event", "My First event", "images/pic2.jpg");

}

public User addUser(String uname,String name, String email, String pwd,String add, String ctry,String pc,String tele) {
User usr;

usr = new User(uname,name, email, pwd, add, ctry, pc,tele);
users[ numUsers ] = usr;
numUsers++;

return usr;
}

public int getNumUsers() { return numUsers; }
public User getUser(int index) { return users[ index ]; }

public EventEntry addEventEntry(String ttl, String txt,String img) {
EventEntry e;

e = new EventEntry(ttl,txt,img);
eventEntries.add(e);

return e;
}

public int getNumEntries() { return eventEntries.size(); }
public EventEntry getEventEntry(int index) { return eventEntries.get(index); }
}