Re: [TM4J-users] FullTextSearch example

[Richard G. <ric...@ya...>]

Hi again,

Well, I got the FullTextSearch example working. I needed to insert the following lines

Properties props = new Properties();
props.put("OPT_LUCENE_ANALYZER", "org.tm4j.topicmap.index.lucene.analyzer");
map.getIndexManager().registerIndexProvider(new LuceneFullTextIndexProvider(props));
    
before the following line in the FullTextSearch() method. 
    
index = (FullTextIndex)map.getIndexManager().getIndex(FullTextIndex.class);

I'm just creating the index in memory, so I haven't set the OPT_LUCENE_DIR property.

However, what is still confusing me, i is that if I now call the index.isOpen() method to it
returns 'true', but, unless I explicity call either the index.open() or index.reindex() methods, I
still get a NullPointerException (stack trace below) when I try to use the index with the line:

QueryResult result  = index.findByText(query, false);

Exception in thread "main" java.lang.NullPointerException
        at org.apache.lucene.store.RAMInputStream.<init>(RAMDirectory.java:237)
        at org.apache.lucene.store.RAMDirectory.openFile(RAMDirectory.java:199)
        at org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:72)
        at org.apache.lucene.index.IndexReader$1.doBody(IndexReader.java:116)
        at org.apache.lucene.store.Lock$With.run(Lock.java:148)
        at org.apache.lucene.index.IndexReader.open(IndexReader.java:111)
        at org.apache.lucene.search.IndexSearcher.<init>(IndexSearcher.java:80)
        at org.tm4j.topicmap.index.text.LuceneIndexBase.findByText(LuceneIndexBase.java:113)
        at mips.genre.topicmaps.FullTextSearch.go(FullTextSearch.java:130)
        at mips.genre.topicmaps.FullTextSearch.main(FullTextSearch.java:96)


I'm note quite sure what's happening, but from looking at the findByText() method in the
LuceneIndexBase class source, I would expect to get the message below rather than a
NullPointerException

if (dir == null) {
            throw new IndexException(
                "FullText index not created. Call open before usage");
       }

Maybe the test 'if (dir == null)' which is also used in the index.isOpen() method, isn't working
properly to check whether the index is open?

Cheers,

Richard.


 --- Richard Gregory <ric...@ya...> wrote: 
> Hi,
> 
> I've been trying to run the full text search example provided with TM4J with one of my topic
> maps,
> but I just get a NullPointerException from the following line in the go() method:
> 
>     QueryResult result  = index.findByText(query, false);
> 
> The string that I'm searching for is the basename of a topic, which is successfully found by the
> BaseNameDataIndex search, so I know it is in the topic map.
> 
> If anyone has any ideas what is going wrong I'd be grateful.
> 
> Cheers,
> 
> Richard.
> 
> 
> 
> 
> 
> 	
> 	
> 		
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