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jcoleman
 Post subject: Absurd null pointer exception
PostPosted: Tue Oct 04, 2005 7:17 am 
Newbie

Joined: Wed Jul 06, 2005 10:18 am
Posts: 5
I am having what appears to be an absurd problem with Tomcat and null pointers (and Hibernate, although this seems only marginally related to Hibernate). When I creat an object via a form, passed to a servlet, then back to the JSP to render the view, I consistently get a null pointer exception. The object is being persisted with no issues, and when I attempt to access the view directly, I can see the newly persisted object with no difficulty. Has anyone encountered anything like this? I'm certain I'm doing something simple that's causing this but can't figure it out for the life of me.

Code:
root cause

java.lang.NullPointerException
        org.apache.jsp.myview_jsp._jspService(org.apache.jsp.myview_jsp:871)
        org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
        org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
        org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        com.mycompany.gtdb.controller.ViewAsset.doGet(Unknown Source)
        com.mycompany.gtdb.controller.ViewAsset.doPost(Unknown Source)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        net.traxtech.gtdb.controller.AddGuntube.doPost(Unknown Source)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        com.mycompany.util.HibernateFilter.doFilter(Unknown Source)


Thanks,

Coleman
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moonlight
 Post subject:
PostPosted: Tue Oct 04, 2005 1:02 pm 
Regular
Regular

Joined: Mon Aug 29, 2005 9:46 am
Posts: 102
what's in line 871 of myview_jsp.java?
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jcoleman
 Post subject:
PostPosted: Wed Oct 12, 2005 3:55 pm 
Newbie

Joined: Wed Jul 06, 2005 10:18 am
Posts: 5
Got it - turns out it was an empty collection that I was not initializing. Adding the newly constructed object to the attributes kept Hibernate from running the getter - which would create an empty collection. I was trying to iterate through said collection in the view, which obviously causes the null pointer exception when said set is simly null and not actually an empty set. Thanks for the pointer!
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