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From Markus Kirsten <markus.kirs...@iped.vxu.se>
Subject Re: Null Pointer Exception - would you please take a look?
Date Tue, 18 Jun 2002 19:27:08 GMT
Hi Eddie,
Have you tried accessing Tomcat directly and not going through Apache? I 
was having too much trouble using mod_webapp together with Apache and 
Tomcat due to that form-based authentication didn't work through Apache 
but it did directly with Tomcat.

Maybe we should all use mod_jk instead. Is anybody running it on Mac OS 
X BTW?


Markus

On tisdag, juni 18, 2002, at 09:15 , Eddie Bush wrote:

> Ok, I just bumped it down to a MemoryRealm and tried that - and it works
> just fine.  What gives with the JDBCRealm?  I really need to get this 
> going!
>
> Thank you for your input!
>
> Eddie
>
> ----- Original Message -----
> From: "Eddie Bush" <ekbush@swbell.net>
> To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>;
> <augustd@codemagi.com>
> Sent: Tuesday, June 18, 2002 1:57 PM
> Subject: Re: Null Pointer Exception - would you please take a look?
>
>
>> I'm getting really annoyed =)  It seems you people haven't actually 
>> read
> my
>> question thoroughly enough to actually understand what I'm doing.  The
>> thought crosses my mind that you see the subject and then just scan and
> put
>> in some standard "Oh he's an idiot - he needs to do this" response.  
>> The
>> problem is with a JDBCRealm!  I do NOTHING to send/receive anything
> to/from
>> the database.  I was of the understanding that Tomcat did this when I
>> configured the realm and set up the security-constraint.
>>
>> While I believe my XML to be valid and correct, I will happily post it 
>> for
>> inspection if someone thinks it would help.  Here is a sequence of what
>> happens and the actors that are involved:
>>
>> Actors:  Me and Tomcat
>>
>> Me:  Enter url of page that is protected by a security constraint into 
>> my
>> browsers address bar.  Press enter.
>> Tomcat:  Returns to the client a page that looks like:
>>
>> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
>> <HTML><HEAD>
>> <META http-equiv=Content-Type content="text/html;
>> charset=windows-1252"></HEAD>
>> <BODY><PRE></PRE></BODY></HTML>
>>
>> (This is not what the actual page is - it's a JSP file - index.jsp - 
>> with
>> much different content.  Also notice I'm not calling a servlet!  Even 
>> if I
>> were, it wouldn't make a bit of difference at this point because Tomcat
>> hasn't authenticated me!  This happens when Tomcat should authenticate
> me -
>> it is NOT my coding!!!)
>>
>> In my server log file, I have an error that starts off as:
>>
>> 2002-06-17 12:29:28
> [org.apache.catalina.connector.warp.WarpRequestHandler]
>> java.lang.NullPointerException
>>     at interbase.interclient.PreparedStatement.setString(Unknown 
>> Source)
>>     at org.apache.catalina.realm.JDBCRealm.credentials(JDBCRealm.java)
>>     at org.apache.catalina.realm.JDBCRealm.authenticate(JDBCRealm.java)
>>     at org.apache.catalina.realm.JDBCRealm.authenticate(JDBCRealm.java)
>>
>> My catalina.out has no indication of anything having gone awry - it 
>> merely
>> has status messages indicating that the server was started (why isn't
> there
>> a timestamp in here?).
>>
>> Any ideas?  Thank you for having actually READ THE ENTIRE MESSAGE so 
>> you
>> UNDERSTAND my problem before having issued a reply =)  Ack!  I'm sorry 
>> but
>> I'm frustrated by the responses I am getting - makes me wanna just 
>> jump up
>> and down and scream at the top of my lungs ... Please - I BEG of you -
> clue
>> me in here - any thoughts why this is happening?  Again, I can post my 
>> XML
>> if you think I need to.
>>
>> A couple of questions people have asked up to this point, along with 
>> the
>> answer:
>>
>> Q: Are you passing a null string?
>> A: I get this when I try to visit a URL that falls under a security
>> constraint.  It's a JDBCRealm.  Tomcat handles this - it is not my 
>> code.
>>
>> Q: Are you sure the fields in your table match what Tomcat is 
>> expecting?
>> A: Initially they didn't.  My fields were of length 14 and Tomcat says
> they
>> should be 15 -- but they're varchar, so does that really matter?  I
> rebuilt
>> the tables so that anything Tomcat uses matches exactly what the docs
> say -
>> meaning I made my fields to be of length 15.  I still get the same
>> response - exactly the same response.
>>
>> Is this the JDBCRealm?  I put my DB driver in common/lib - so Tomcat
> SHOULD
>> be able to find it - right?  Is this the appropriate spot?  Is it 
>> possible
>> (and how possible?) that this is my driver?  I use this driver just 
>> fine
>> doing JDBC stuff all the time - no problem.
>>
>> Thanks for your time!
>>
>> Eddie
>>
>> ----- Original Message -----
>> From: "August Detlefsen" <augustd123@yahoo.com>
>> To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
>> Sent: Tuesday, June 18, 2002 1:24 PM
>> Subject: Re: Null Pointer Exception - would you please take a look?
>>
>>
>>> If you are trying to insert a NULL into a NOT NULL column (or are
>>> trying to insert special chars or the String is too long), you should
>>> get a SQLException, not a NullPointerException.
>>>
>>> You should recheck that you are actually getting a valid Connection
>>
>>
>>
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