Re: Xml doc = dom.parseString(request.getReader());

From:

Daniel Pitts <googlegroupie@coloraura.com>

Newsgroups:

comp.lang.java.programmer

Date:

Mon, 24 Sep 2007 14:02:41 -0000

Message-ID:

<1190642561.703938.188540@50g2000hsm.googlegroups.com>

On Sep 24, 5:36 am, gert <gert.cuyk...@gmail.com> wrote:

On Sep 24, 5:34 am, Daniel Pitts <googlegrou...@coloraura.com> wrote:

On Sep 23, 8:05 pm, gert <gert.cuyk...@gmail.com> wrote:

On Sep 24, 4:31 am, Daniel Pitts <googlegrou...@coloraura.com> wrote:

On Sep 23, 6:05 pm, gert <gert.cuyk...@gmail.com> wrote:

On Sep 24, 2:46 am, gert <gert.cuyk...@gmail.com> wrote:

I get a java.lang.NullPointerException when i do this ?

try {doc = parser.parse(xmlText);}
catch (SAXException ex){out.println(" <error>"+ex+"</error>\n");}

Debugger or compiler doesn't give me any warnings or anything ?

Why do i always get a 500 response ?

try {doc = parser.parse(new InputSource(in));}
catch (SAXException ex){out.println(" <error>"+ex+"</error>\n");}

deployed with moduleid = www
StandardWrapperValve[query]: PWC1406: Servlet.service() for servlet
query threw exception
java.lang.NullPointerException
at query.doPost(query.java:37)

What is on line 37 of query.java?

BTW, Class names (and therefor .java files) should always start with a
capitol case letter. "Query" would then be appropriate.

Make sure that "parser" is an actual value, and not just null. You
need to get it from the
DocumentBuilderFactory().newInstance().newDocumentBuilder()

Here is the source code.http://appwsgi.googlecode.com/svn/trunk/java/query.java
Feel free to give allot of suggestions :)

NullPointerException refers to,
doc = parser.parse(new InputSource(in));

Add somewhere:
parser = DocumentBuilderFactory().newInstance().newDocumentBuilder()

import javax.xml.parsers.*;

DocumentBuilder parser = null;
parser = DocumentBuilderFactory().newInstance().newDocumentBuilder();

I am sorry i must misunderstand something because the compiler doesn't
like it telling me it cant find the symbols.

I'm sorry, I had a typo. I added a spurious "()"
Try this: DocumentBuilderFactory.newInstance().newDocumentBuilder()

Also, try using you own discretion when copying peoples examples. You
aren't going to be successful as a programmer unless you can figure
things out on your own.