NullPointerException in solr multicore

Question

Hi!

I'm configuring my solr for two cores and have got most of it working, but I'm getting this cryptic error.

First off, here's my solr.xml:

<?xml version='1.0' encoding='UTF-8'?>
<solr persistent="true">
 <cores adminPath="/admin/cores">
  <core name="cars" dataDir="/var/lib/solr/data/cars" config="/etc/solr/home_cars/conf/solrconfig.xml" schema="/etc/solr/home_cars/conf/schema.xml" instanceDir="home_cars" />
  <core name="industrial" dataDir="/var/lib/solr/data/industrial" config="/etc/solr/home_industrial/conf/solrconfig.xml" schema="/etc/solr/home_industrial/conf/schema.xml" instanceDir="home_industrial" />
 </cores>
</solr>

All of this seems fine. I believe I've set the proper permissions for all the locations, but still I get this error in catalina.out:

INFO: user.dir=/var/lib/tomcat6
Aug 8, 2010 2:03:27 PM org.apache.solr.common.SolrException log
SEVERE: java.lang.NullPointerException
        at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:173)
        at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:131)
        at org.apache.solr.core.SolrCore.execute(SolrCore.java:1317)
        at org.apache.solr.core.QuerySenderListener.newSearcher(QuerySenderListener.java:52)
        at org.apache.solr.core.SolrCore$3.call(SolrCore.java:1147)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at java.lang.Thread.run(Thread.java:636)

Some [info] logs and then this one:

SEVERE: java.lang.NullPointerException
        at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:173)
        at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:131)
        at org.apache.solr.core.SolrCore.execute(SolrCore.java:1317)
        at org.apache.solr.core.QuerySenderListener.newSearcher(QuerySenderListener.java:52)
        at org.apache.solr.core.SolrCore$3.call(SolrCore.java:1147)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at java.lang.Thread.run(Thread.java:636)

I'm not a top cat in solr, java or tomcat (or much else for that matter, hehe). Any help is will be greatly appreciated!

Answer 1

It seems like this happens because QueryElevationComponent's config doesn't exist. Try this:

http://wiki.apache.org/solr/QueryElevationComponent