FAQ
Yes it is possible. Instead of catching an Exception you can do anything
else, e.g.
try {
...}
catch (MyException e) {
System.err.prinltn(e.class.forName());
}
But this is off-topic here, it´s an gereral question about java.

Michael

-----Ursprüngliche Nachricht-----
Von: Günter Kukies
Gesendet: Montag, 24. Februar 2003 17:52
An: Lucene Users List
Betreff: Re: IndexWriter addDocument NullPointerException


I switched off the -server switch from the java commandline options and
everything works fine now.
I changed nothing in my code.

So is it principly possible to throw an Exception with not stack trace?

Any comments about this phenomenon?

Günter


----- Original Message -----
From: "Otis Gospodnetic" <otis_gospodnetic@yahoo.com>
To: "Lucene Users List" <lucene-user@jakarta.apache.org>
Sent: Monday, February 24, 2003 4:31 PM
Subject: Re: IndexWriter addDocument NullPointerException

If I were you I would make things simpler for myself by converting the
code to something that I could run from the command line instead of
having to go through Tomcat.

You really need to capture your exception stack trace with lne numbers,
and then we can try helping.

Otis


--- Günter_Kukies wrote:
log("doc: "+doc); is handled by tomcat and directed into special
log-files,
so you can't see them.
System.err.println("hallo1 "+doc);
ex.printStackTrace();
System.err.println("hallo2");
this is printing the relevant output.

doc is never null, writer is never null and I can't add null-fields
to a
document.


Günter

----- Original Message -----
From: "Otis Gospodnetic" <otis_gospodnetic@yahoo.com>
To: "Lucene Users List" <lucene-user@jakarta.apache.org>
Sent: Monday, February 24, 2003 3:07 PM
Subject: Re: IndexWriter addDocument NullPointerException

My guess is that your 2 getDocument calls are the source, that is, that
those PDF and TXT classes don't return a proper Document.
I also don't see the output created by log("doc: "+doc);

Otis


if(path.matches("\\d+_\\d{4}_[a-z]{2,3}\\.pdf")) {
doc =
PDF_Document_Parser.getDocument(this,RealPath,file);
}
else if(path.matches("\\d+_\\d{4}_[a-z]{2,3}\\.txt")) {
doc =
TXT_Document_Parser.getDocument(this,RealPath,file);
}


--- Günter_Kukies wrote:
So, weekend is over.

here is some code :

private void addDocument(IndexWriter writer, File file )
throws
IOException, InterruptedException {
String path = file.getName();
log( "-------------start Indexing:" + path );
Document doc = null;
if(path.matches("\\d+_\\d{4}_[a-z]{2,3}\\.pdf")) {
doc =
PDF_Document_Parser.getDocument(this,RealPath,file);
}
else if(path.matches("\\d+_\\d{4}_[a-z]{2,3}\\.txt")) {
doc =
TXT_Document_Parser.getDocument(this,RealPath,file);
}
else {
log("do nothing");
}

log("doc: "+doc);
if( doc != null ) {
try {
writer.addDocument(doc);
}
catch(Exception ex) {
System.err.println("hallo1 "+doc);
ex.printStackTrace();
System.err.println("hallo2");
log("ERROR writer.addDocument(doc);");
}
}
else {
log( "Skipping " + path );
}
log( "-------------end Indexing:" + path );
}



Here is the output:

hallo1 Document<Text<contents:java.io.InputStreamReader@18a3a1d>
Unindexed<email:hansdampf@xxx.com> Unindexed<name:Hans Dampf>
Text<summary:Equipo de deteccion 2002> Text<title:Equipo de
deteccion
2002>
Text<doctypeid:0001> Unindexed<lifetime:0>
org.apache.lucene.document.Field@1ed688f
Keyword<modified:0dcek766w>
Keyword<username:hda>
Unindexed<relative_path_xml:documents/news_new/sub1/sub11/sub111/10457359746
80_0001_hda.xml>
Unindexed<category:documents/news_new/sub1/sub11/sub111/>
Keyword<search_all:all> org.apache.lucene.document.Field@16b98c3
Unindexed<relative_path:documents/news_new/sub1/sub11/sub111/1045735974680_0
001_hda.pdf>>
java.lang.NullPointerException
hallo2
hallo1 Document<Text<contents:java.io.InputStreamReader@c12978>
Unindexed<email:hansdampf@xxx.com> Unindexed<name:Hans Dampf>
Text<summary:testsummary> Text<title:testtitle>
Text<doctypeid:0001>
Unindexed<lifetime:0> org.apache.lucene.document.Field@189c12a
Keyword<modified:0dcek76bm> Keyword<username:hda>
Unindexed<relative_path_xml:documents/news_new/sub1/sub11/sub111/10457359748
50_0001_hda.xml>
Unindexed<category:documents/news_new/sub1/sub11/sub111/>
Keyword<search_all:all> org.apache.lucene.document.Field@e8c7db
Unindexed<relative_path:documents/news_new/sub1/sub11/sub111/1045735974850_0
001_hda.pdf>>
java.lang.NullPointerException
hallo2

Günter

----- Original Message -----
From: "Tatu Saloranta" <tatu@hypermall.net>
To: "Lucene Users List" <lucene-user@jakarta.apache.org>
Sent: Saturday, February 22, 2003 5:32 PM
Subject: Re: IndexWriter addDocument NullPointerException

On Friday 21 February 2003 13:22, Günter Kukies wrote:
Hello,

I don't have any line number.
You unfortunately do need to know the line number, if you do
get an
exception
and try to see where it occurs.
Another less frequent problem is that you actually get the
exception as an
object and print out that exception; in that case you would
just
see
"java.lang.NullPointerException", and nothing else?
Otherwise, based on your code, you should see a stack trace,
with
or
without
line numbers. But you would at least see the method call stack,
which
would
help in figuring out where problem occured.

However, if you do catch an exception, and stack trace doesn't
have
line
numbers (it seems that some JVMs do not have line number info
available
when
running JIT'ed code) there are basically two ways to figure out exact
location:

(1) Try to make JVM get the line number info (either running in
interpreted
mode; I think there was option, something like
'-Djava.compiler=
' to
disable JIT?)
(2) Run code in a debugger. One nice free debugger (if you are
not
using
an
IDE that has one is JSwat:
http://www.bluemarsh.com/java/jswat/

Hope this helps,

-+ Tatu +-
this is the code snippet:

Document doc;
IndexWriter writer;

.....

try{
writer.addDocument(doc);
}
catch(Exception ex){
ex.printStackTrace();
}

this is the output on Standard.out:

java.lang.NullPointerException


and nothing more.

The doc is not null and System.out.println(doc) seems to be
ok.
There is
no difference between the working 80% and the not working 20%
doc's.
Thanks,

Günter
On Friday 21 February 2003 05:33, Günter Kukies wrote:
Hello,

writer.addDocument(doc) is throwing an
NullPointerException.
The
stacktrace from the catched Exception is only one line
"NullPointerException" without anything else. I open the
IndexWriter
with create true. Run over the files in a Directory and
add
all found
documents. After that i close the indexwriter. 80% of the
documents
were added without problems. The rest gets that
NullPointerException.
Any Ideas?
Perhaps look at the line where the null pointer exception
is
thrown
and
see what happens? NullPointerException is thrown when a
null
reference
is being de-referenced. Seeing the immediate cause should
be
easy,
given line number.

Perhaps you have added a field with null value? (just a
guess,
I don't
know if that's even illegal).

-+ Tatu +-

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