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From Frédéric Glorieux <>
Subject custom writer, working but... a strange exception in logs
Date Wed, 06 Jun 2007 09:32:33 GMT

Hi all,

At first, lucene user for years, I should really thanks you for Solr.

For a start, I wrote a little results writer for an app. It works like 
what I understand of Solr, except a strange exception I'm not able to 

Version : fresh subversion.
  1. Class
  2. stacktrace
  3. maybe ?

1. Class

public class HTMLResponseWriter implements QueryResponseWriter {
   public static String CONTENT_TYPE_HTML_UTF8 = "text/html; charset=UTF-8";
   /** A custom HTML header configured from solrconfig.xml */
   static String HEAD;
   /** A custom HTML footer configured from solrconfig.xml */
   static String FOOT;

   /** get some snippets from conf */
   public void init(NamedList n) {
     String s=(String)n.get("head");
     if (s != null && !"".equals(s)) HEAD = s;
     if (s != null && !"".equals(s)) FOOT = s;

   public void write(Writer writer, SolrQueryRequest req, 
SolrQueryResponse rsp)
       throws IOException {
     // cause the exception below
     /* loop on my results, working like it should */
     // cause the exception below

   public String getContentType(SolrQueryRequest request, 
SolrQueryResponse response) {


2. Stacktrace

GRAVE: org.apache.solr.core.SolrException: Missing required parameter: q
	at org.apache.solr.core.SolrCore.execute(
	at org.apache.solr.servlet.SolrServlet.doGet(
	at javax.servlet.http.HttpServlet.service(

3. Maybe ?

I can't figure why, but when writer.write(HEAD) is executed, I see code 
from StandardRequestHandler executed 2 times in the debugger, first is 
OK, second hasn't the q parameter. Displaying results is always OK. 
Without such lines, there is only one call to StandardRequestHandler, no 
exception in log, but no more head or foot. When HEAD and FOOT values 
are hard coded and not configured, there's no exception. If HEAD and 
FOOT are not static, problem is the same.

Is it a mistake in my code ? Every piece of advice welcome, and if I 
touch a bug, be sure I will do my best to help.

Frédéric Glorieux
École nationale des chartes
direction des nouvelles technologies et de l'informatique

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