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Date: Thu, 18 Aug 2005 10:01:00 +0200
From: Marcel Reutegger <marcel.reutegger@gmx.net>
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To: jackrabbit-dev@incubator.apache.org
Subject: Re: query problem
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 <43040BEA.6050600@osafoundation.org>
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Hi Brian,

this is clearly a bug. however, your query will never return any results.

If you want to specify an absolute XPath it must always begin with 
/jcr:root otherwise you won't get any results. You may also write a 
relative XPath, which would be something like:

bcm/cal//element(*, caldav:resource)[@caldav:uid = 
'59BC120D-E909-4A56-A70D-8E97914E51A3']

and of course using:

//whatever

will also work because it includes /jcr:root

See spec section 6.6.4.3

Running a similar query with test data on my workspace returned the 
expected results when using an absolute path beginning with /jcr:root or 
when using a relative path.

I have not been able to reproduce a indefinite hang. even with the 
'wrong' absolute query.

Could you please try to create a threaddump while jackrabbit seems to 
hang and post it to this list? thanks

I'll create a jira issue in the meantime and fix the 
UnsupportedOperationException asap.

regards
  marcel

Brian Moseley wrote:
> 
> well, i updated to the latest code, including the recent search changes, 
> and things are even worse: the query seems to hang indefinitely, never 
> returning.
> 
> for what's it worth, this query works as expected:
> 
> //element(*, caldav:resource)[@caldav:uid = '1']
> 
> Brian Moseley wrote:
> 
>>
>> is there anything wrong with the formulation of this xpath query 
>> statement?
>>
>> /bcm/cal//element(*, caldav:resource)[@caldav:uid = 
>> '59BC120D-E909-4A56-A70D-8E97914E51A3']
>>
>> i'm trying to find all nodes of type "caldav:resource" underneath (but 
>> not including) /bcm/cal where the "caldav:uid" property is the value 
>> given in the query.
>>
>> when i execute the query, i get the below exception. looks like i'm 
>> not being successful in specifying a descendents-only query, but i 
>> can't imagine that's what's causing the exception...
>>
>> thanks!
>>
>> java.lang.UnsupportedOperationException
>>         at 
>> org.apache.jackrabbit.core.query.lucene.CachingMultiReader$MultiTermDocs.skipTo(CachingMultiReader.java:281) 
>>
>>         at org.apache.lucene.search.TermScorer.skipTo(TermScorer.java:88)
>>         at 
>> org.apache.lucene.search.ConjunctionScorer.doNext(ConjunctionScorer.java:53) 
>>
>>         at 
>> org.apache.lucene.search.ConjunctionScorer.next(ConjunctionScorer.java:48) 
>>
>>         at org.apache.lucene.search.Scorer.score(Scorer.java:37)
>>         at 
>> org.apache.jackrabbit.core.query.lucene.ChildAxisQuery$ChildAxisScorer.calculateChildren(ChildAxisQuery.java:291) 
>>
>>         at 
>> org.apache.jackrabbit.core.query.lucene.ChildAxisQuery$ChildAxisScorer.next(ChildAxisQuery.java:251) 
>>
>>         at org.apache.lucene.search.Scorer.score(Scorer.java:37)
>>         at 
>> org.apache.jackrabbit.core.query.lucene.DescendantSelfAxisQuery$DescendantSelfAxisScorer.calculateSubHits(DescendantSelfAxisQuery.java:302) 
>>
>>         at 
>> org.apache.jackrabbit.core.query.lucene.DescendantSelfAxisQuery$DescendantSelfAxisScorer.next(DescendantSelfAxisQuery.java:237) 
>>
>>         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:287) 
>>
>>         at 
>> org.apache.jackrabbit.core.query.lucene.QueryImpl.execute(QueryImpl.java:179) 
>>
>>         at 
>> org.apache.jackrabbit.core.query.QueryImpl.execute(QueryImpl.java:132)
>>
>>
> 
>