Error using function deref

[Alvaro Gonzalez <ag...@germinus.com>]

Hi everybody.
I have a problem when I search a repository using the "deref" function. 
When I search with this query:

/         "/jcr:root/path/referencer/jcr:deref(@aReference,'*')"

/  it works good, it returns the node referenced. But if I try to search 
with a query of this type:

/        "//referencer/jcr:deref(@aReference)"

/ the application throws a NullPointer (trace included below).

¿Is this a bug or is not possible to use "//" in a query path when using 
deref functions?

We are using SimpleDbPersistenceManager with postgresql.

Regards,
  Alvaro


java.lang.NullPointerException
    at 
org.apache.jackrabbit.core.query.lucene.DerefQuery$DerefScorer.calculateChildren(DerefQuery.java:281)
    at 
org.apache.jackrabbit.core.query.lucene.DerefQuery$DerefScorer.next(DerefQuery.java:221)
    at org.apache.lucene.search.Scorer.score(Scorer.java:37)
    at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:92)
    at org.apache.lucene.search.Hits.getMoreDocs(Hits.java:64)
    at org.apache.lucene.search.Hits.<init>(Hits.java:43)
    at org.apache.lucene.search.Searcher.search(Searcher.java:33)
    at org.apache.lucene.search.Searcher.search(Searcher.java:27)
    at 
org.apache.jackrabbit.core.query.lucene.SearchIndex.executeQuery(SearchIndex.java:337)
    at 
org.apache.jackrabbit.core.query.lucene.QueryImpl.execute(QueryImpl.java:174)
    at 
org.apache.jackrabbit.core.query.QueryImpl.execute(QueryImpl.java:132)

-- 
Alvaro Gonzalez de Paz
Germinus XXI
http://www.germinus.com

Avda. de Manoteras, 44. 2ª planta.
28050 - Madrid (Spain)
Tel (+34) 91 296 12 34
Fax (+34) 91 296 12 30

Re: Error using function deref

[Marcel Reutegger <ma...@gmx.net>]

Hi Alvaro,

did you recently update jackrabbit to a newer version and are still 
using index data created by an older version?

the exception indicates that there is a node in the index that does not 
have a single property, which is basically impossible. unless the index 
was created with a (quite) old jackrabbit version.

Do you see the same exception, when you recreate the index and than run 
the query again?

I was not able to reproduce the exception, though I'm not using 
extensive test data in my workspace. If you are able to reproduce the 
exception with well defined data you added to a workspace that would be 
a great help.

regards
  marcel

Alvaro Gonzalez wrote:
> Hi everybody.
> I have a problem when I search a repository using the "deref" function. 
> When I search with this query:
> 
> /         "/jcr:root/path/referencer/jcr:deref(@aReference,'*')"
> 
> /  it works good, it returns the node referenced. But if I try to search 
> with a query of this type:
> 
> /        "//referencer/jcr:deref(@aReference)"
> 
> / the application throws a NullPointer (trace included below).
> 
> ¿Is this a bug or is not possible to use "//" in a query path when using 
> deref functions?
> 
> We are using SimpleDbPersistenceManager with postgresql.
> 
> Regards,
>  Alvaro
> 
>