tomcat - solr 多核中的 NullPointerException

Question

我正在为两个内核配置我的 solr，并且大部分工作正常，但我遇到了这个神秘的错误。

首先，这是我的 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>

这一切似乎都很好。我相信我已经为所有位置设置了适当的权限，但我仍然在 catalina.out 中收到此错误:

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)

一些 [info] 日志，然后是这个:

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)

我不是 solr、java 或 tomcat(或其他许多方面的专家，呵呵)。任何帮助将不胜感激!

Answer 1

这似乎是因为 QueryElevationComponent 的配置不存在。试试这个:

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