null pointer

[Tony Lavalle <tl...@gmail.com>]

I am a student taking a jsp class.  the class project uses an access 
database.  my problem is that every time i run the program it keeps 
giving me and npe error.  i have check the html and the jsp.  but i can 
see no error.  can you folks give me some ideas as where to start to fix 
this.  i am running apache 2.0.52 with tomcat 5.5.7.  i have office 2003 
install.  the other students are runnig tomcat 4 i believe there are 
others that are using tomcat5 but not sure.

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Re: null pointer

[David Causse <dc...@cognitis.fr>]

Tony Lavalle wrote:

> I am a student taking a jsp class.  the class project uses an access 
> database.  my problem is that every time i run the program it keeps 
> giving me and npe error.  i have check the html and the jsp.  but i 
> can see no error.  can you folks give me some ideas as where to start 
> to fix this.  i am running apache 2.0.52 with tomcat 5.5.7.  i have 
> office 2003 install.  the other students are runnig tomcat 4 i believe 
> there are others that are using tomcat5 but not sure.

Check the stack trace and look for the jsp converted to java inside the 
work/ tomcat directory to check wich line generated the error.
If you don't have a stackTrace surround all your jsp with a try/catch
<%try {%>
YOUR JSP ...
<%} catch(NullPointerException npe) {
    npe.printStackTrace();
}%>
and check the tomcat log (console or catalina.out inside the logs subdir).

Good luck.


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