Re: Synonym file in a different location or loading synonyms from database

[rajam <rx...@portaltech.net>]

Thanks Otis.

I tried putting the absolute path and it worked. But I wanted something
configurable so that it can be changed if required.(may be thro an admin
interface?)

In the mean time, another idea stuck to maintain all the synonyms in
database. I tried writing a FilterFactory of my own for creating the
SynonymMap and SynonymFilter. I couldn't get this working and getting
NullPointerException as in the stack trace below.

21:16:10,921 ERROR [STDERR] 23-Apr-2009 21:16:10
org.apache.solr.common.SolrException log
SEVERE: java.lang.NullPointerException
        at
org.apache.solr.analysis.SynonymFilter.next(SynonymFilter.java:79)
        at org.apache.lucene.analysis.StopFilter.next(StopFilter.java:120)
        at
org.apache.solr.analysis.WordDelimiterFilter.next(WordDelimiterFilter.java:272)
        at
org.apache.lucene.analysis.LowerCaseFilter.next(LowerCaseFilter.java:34)
        at
org.apache.solr.analysis.EnglishPorterFilter.next(EnglishPorterFilterFactory.java:106)
        at org.apache.lucene.analysis.TokenStream.next(TokenStream.java:47)
        at
org.apache.solr.analysis.BufferedTokenStream.read(BufferedTokenStream.java:94)
        at
org.apache.solr.analysis.BufferedTokenStream.next(BufferedTokenStream.java:80)
        at org.apache.lucene.analysis.TokenStream.next(TokenStream.java:91)
        at
org.apache.lucene.queryParser.QueryParser.getFieldQuery(QueryParser.java:519)
        at
org.apache.solr.search.SolrQueryParser.getFieldQuery(SolrQueryParser.java:116)
        at
org.apache.lucene.queryParser.QueryParser.Term(QueryParser.java:1324)
        at
org.apache.lucene.queryParser.QueryParser.Clause(QueryParser.java:1211)
        at
org.apache.lucene.queryParser.QueryParser.Query(QueryParser.java:1139)
        at
org.apache.lucene.queryParser.QueryParser.TopLevelQuery(QueryParser.java:1128)
        at
org.apache.lucene.queryParser.QueryParser.parse(QueryParser.java:170)
        at
org.apache.solr.search.LuceneQParser.parse(LuceneQParserPlugin.java:79)
        at
org.apache.solr.search.OldLuceneQParser.parse(LuceneQParserPlugin.java:119)
        at org.apache.solr.search.QParser.getQuery(QParser.java:88)
        at
org.apache.solr.handler.component.QueryComponent.prepare(QueryComponent.java:82)


It looks like I am missing some configuration and solr is not updating the
SynonymMap or SynonymFilter when my factory class is invoked. But I am sure
that my factory class is invoked.

In the schema.xml, I updated the index analyzer as 
<filter class="custom class" synonyms="synonyms.txt" ignoreCase="true"
expand="false"/>

The query analyzer is updated as 
<filter class="custom class" synonyms="synonyms.txt" ignoreCase="true"
expand="true"/>


Is there any thing which is obvious that's missed?

Regards,
Raja

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