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From "Cam Bazz" <camb...@gmail.com>
Subject IndexSearcher and Multiple Threads
Date Mon, 28 Jan 2008 08:04:28 GMT
Hello,

Is IndexSearcher ThreadSafe? I made a simple httpserver using grizzly as
described in
http://jlorenzen.blogspot.com/2007/06/using-grizzly-to-create-simple-http.html
which submit queries to a single instance of indexsearcher and I get some
errors (when I query with more then one threads) such as:

Jan 28, 2008 9:52:56 AM com.sun.grizzly.http.DefaultProcessorTaskinvokeAdapter
SEVERE: processorTask.serviceError
java.lang.NullPointerException
    at org.apache.lucene.queryParser.QueryParser.jj_scan_token(
QueryParser.java:1427)
    at org.apache.lucene.queryParser.QueryParser.jj_3R_3(QueryParser.java
:1319)
    at org.apache.lucene.queryParser.QueryParser.jj_3_1(QueryParser.java
:1313)
    at org.apache.lucene.queryParser.QueryParser.jj_2_1(QueryParser.java
:1297)
    at org.apache.lucene.queryParser.QueryParser.Clause(QueryParser.java
:991)
    at org.apache.lucene.queryParser.QueryParser.Query(QueryParser.java:948)
    at org.apache.lucene.queryParser.QueryParser.TopLevelQuery(
QueryParser.java:937)
    at org.apache.lucene.queryParser.QueryParser.parse(QueryParser.java:147)
    at sys.GGSearcher.searchQuery(GGSearcher.java:70)
    at sys.EmbeddedServer.service(EmbeddedServer.java:52)
    at com.sun.grizzly.http.DefaultProcessorTask.invokeAdapter(
DefaultProcessorTask.java:599)
    at com.sun.grizzly.http.DefaultProcessorTask.doProcess(
DefaultProcessorTask.java:530)
    at com.sun.grizzly.http.DefaultProcessorTask.process(
DefaultProcessorTask.java:774)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(
DefaultProtocolFilter.java:130)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(
DefaultProtocolChain.java:102)
    at com.sun.grizzly.DefaultProtocolChain.execute(
DefaultProtocolChain.java:78)
    at com.sun.grizzly.http.SelectorThread$1.execute(SelectorThread.java
:637)
    at com.sun.grizzly.ProtocolChainContextTask.call(
ProtocolChainContextTask.java:61)
    at com.sun.grizzly.util.WorkerThreadImpl.run(WorkerThreadImpl.java:179)
Jan 28, 2008 9:52:56 AM com.sun.grizzly.http.DefaultProcessorTaskinvokeAdapter
SEVERE: processorTask.serviceError
org.apache.lucene.queryParser.ParseException: Cannot parse 'test':
Encountered "<EOF>" at line 1, column 0.
Was expecting one of:
    <NOT> ...
    "+" ...
    "-" ...
    "(" ...
    "*" ...
    <QUOTED> ...
    <TERM> ...
    <PREFIXTERM> ...
    <WILDTERM> ...
    "[" ...
    "{" ...
    <NUMBER> ...


This error does not happen if I do searches one at a time.

Best Regards,
-C.B.

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