我的客户端应用程序找到我的 Solr 4.2.1 服务器并且似乎能够索引文档。我还没有写任何查询代码。但是当我访问 Solr Admin 后台时，当我单击查询时，出现以下异常:
Apr 16, 2013 4:55:31 PM org.apache.solr.core.SolrCore execute
INFO: [1050] webapp=/viparis-solr-server path=/admin/file params={file=/usr/local/tomcat7/webapps/viparis-solr-server/Proto/solr/common/fr/schema.xml&contentType=text/xml;charset%3Dutf-8} status=500 QTime=27
Apr 16, 2013 4:55:31 PM org.apache.solr.common.SolrException log
SEVERE: null:java.lang.NullPointerException
at org.apache.solr.handler.admin.ShowFileRequestHandler.showFromFileSystem(ShowFileRequestHandler.java:212)
at org.apache.solr.handler.admin.ShowFileRequestHandler.handleRequestBody(ShowFileRequestHandler.java:122)
at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:1816)
at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:448)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:269)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:200)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
事实上，文件/usr/local/tomcat7/webapps/viparis-solr-server/Proto/solr/common/fr/schema.xml存在，并且Tomcat服务器具有访问它的阅读权限。该路径在 solr.xml 中定义为核心配置的一部分。
有什么想法吗？
编辑: 根据 Arkain 的建议，这是我的 schema.xml 的一部分。它实际上是我从另一个正常工作的 Solr 服务器获取它后更改的唯一部分，所以问题可能就在那里:
<field name="TYPE" type="string" indexed="true" stored="true"/>
<field name="id_manifestation" type="string" indexed="true" stored="true"/>
<field name="nom" type="string" indexed="true" stored="true" omitNorms="false"/>
<field name="nomFr" type="text_full" indexed="false" stored="true"/>
<field name="nomEn" type="text_full" indexed="false" stored="true"/>
<field name="theme" type="string" indexed="false" stored="true" multiValued="true"/>
<field name="descriptionEn" type="string" indexed="true" stored="true" multiValued="true"/>
<field name="descriptionFr" type="string" indexed="true" stored="true" multiValued="true"/>
<field name="motsCleEn" type="text_full" indexed="true" stored="true" multiValued="true"/>
<field name="motsCleFr" type="text_full" indexed="true" stored="true" multiValued="true"/>
<field name="dateDebut" type="date" indexed="true" stored="true"/>
<field name="dateFin" type="date" indexed="true" stored="true"/>
<field name="url" type="string" indexed="false" stored="true"/>
<field name="logo" type="string" indexed="false" stored="true"/>
编辑: 这是我的 solrconfig.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!--
This is a stripped down config file used for a simple example...
It is *not* a good example to work from.
-->
<config>
<luceneMatchVersion>LUCENE_41</luceneMatchVersion>
<!-- The DirectoryFactory to use for indexes.
solr.StandardDirectoryFactory, the default, is filesystem based.
solr.RAMDirectoryFactory is memory based, not persistent, and doesn't work with replication. -->
<directoryFactory name="DirectoryFactory" class="${solr.directoryFactory:solr.StandardDirectoryFactory}"/>
<dataDir>${solr.core1.data.dir:}</dataDir>
<updateHandler class="solr.DirectUpdateHandler2">
<!-- <updateLog> -->
<!-- <str name="dir">${solr.core1.data.dir:}</str> -->
<!-- </updateLog> -->
</updateHandler>
<!-- realtime get handler, guaranteed to return the latest stored fields
of any document, without the need to commit or open a new searcher. The current
implementation relies on the updateLog feature being enabled. -->
<requestHandler name="/get" class="solr.RealTimeGetHandler">
<lst name="defaults">
<str name="omitHeader">true</str>
</lst>
</requestHandler>
<requestHandler name="/replication" class="solr.ReplicationHandler" startup="lazy" />
<requestDispatcher handleSelect="true" >
<requestParsers enableRemoteStreaming="false" multipartUploadLimitInKB="2048" formdataUploadLimitInKB="2048" />
</requestDispatcher>
<requestHandler name="standard" class="solr.StandardRequestHandler" default="true" />
<requestHandler name="/analysis/field" startup="lazy" class="solr.FieldAnalysisRequestHandler" />
<requestHandler name="/update" class="solr.UpdateRequestHandler" />
<requestHandler name="/admin/" class="org.apache.solr.handler.admin.AdminHandlers" />
<requestHandler name="/admin/ping" class="solr.PingRequestHandler">
<lst name="invariants">
<str name="q">solrpingquery</str>
</lst>
<lst name="defaults">
<str name="echoParams">all</str>
</lst>
</requestHandler>
<!-- multi-colored tag FragmentsBuilder -->
<!-- <fragmentsBuilder name="colored" class="org.apache.solr.highlight.ScoreOrderFragmentsBuilder"> -->
<!-- <lst name="defaults"> -->
<!-- <str name="hl.tag.pre"><![CDATA[ -->
<!-- <b style="background:yellow">,<b style="background:lawgreen">, -->
<!-- <b style="background:aquamarine">,<b style="background:magenta">, -->
<!-- <b style="background:palegreen">,<b style="background:coral">, -->
<!-- <b style="background:wheat">,<b style="background:khaki">, -->
<!-- <b style="background:lime">,<b style="background:deepskyblue">]]></str> -->
<!-- <str name="hl.tag.post"><![CDATA[</b>]]></str> -->
<!-- </lst> -->
<!-- </fragmentsBuilder> -->
<!-- Spell Check
The spell check component can return a list of alternative spelling
suggestions.
http://wiki.apache.org/solr/SpellCheckComponent
-->
<searchComponent name="spellcheck" class="solr.SpellCheckComponent">
<str name="queryAnalyzerFieldType">textSpell</str>
<lst name="spellchecker">
<str name="name">default</str>
<str name="field">textng</str>
<str name="spellcheckIndexDir">spellchecker</str>
<str name="classname">solr.IndexBasedSpellChecker</str>
<str name="buildOnCommit">true</str>
<str name="comparatorClass">score</str>
</lst>
<!--<lst name="spellchecker">-->
<!-- <str name="name">suggest</str>-->
<!-- <str name="classname">org.apache.solr.spelling.suggest.Suggester</str>-->
<!-- <str name="lookupImpl">org.apache.solr.spelling.suggest.tst.TSTLookup</str>-->
<!-- -->
<!-- <str name="field">textng</str> the indexed field to derive suggestions from -->
<!-- <float name="threshold">0.005</float>-->
<!-- <str name="buildOnCommit">true</str>-->
<!--</lst>-->
</searchComponent>
<!-- A request handler for demonstrating the spellcheck component.
NOTE: This is purely as an example. The whole purpose of the
SpellCheckComponent is to hook it into the request handler that
handles your normal user queries so that a separate request is
not needed to get suggestions.
IN OTHER WORDS, THERE IS REALLY GOOD CHANCE THE SETUP BELOW IS
NOT WHAT YOU WANT FOR YOUR PRODUCTION SYSTEM!
See http://wiki.apache.org/solr/SpellCheckComponent for details
on the request parameters.
-->
<requestHandler name="/spell" class="solr.SearchHandler" startup="lazy">
<lst name="defaults">
<str name="df">textng</str>
<str name="spellcheck.dictionary">default</str>
<str name="spellcheck.onlyMorePopular">true</str>
<str name="spellcheck.extendedResults">true</str>
<str name="spellcheck.collate">true</str>
<str name="spellcheck.count">10</str>
<str name="spellcheck.maxCollations">10</str>
<str name="spellcheck.maxCollationTries">10</str>
<str name="spellcheck.collateExtendedResults">true</str>
<str name="spellcheck">true</str>
<str name="defType">edismax</str>
<str name="rows">100</str>
<str name="fl">*,score</str>
<str name="qf">textng^100</str>
<str name="sort">TYPE asc, score desc</str>
<str name="pf">textng^100</str>
<double name="typeboost">1.0</double>
<str name="debugQuery">false</str>
<str name="facet">on</str>
<str name="facet.field">nom_manifestation</str>
<str name="facet.limit">-1</str>
<str name="hl.highlightMultiTerm">true</str>
<str name="hl.fragsize">200</str>
<str name="hl.snippets">200</str>
<!-- <str name="hl.fragmentsBuilder">colored</str> -->
<!-- <str name="hl.fragListBuilder">simple</str> -->
<str name="hl.fl">*</str>
<str name="hl.usePhraseHighlighter">true</str>
<str name="hl">true</str>
</lst>
<arr name="first-components">
<str>spellcheck</str>
</arr>
</requestHandler>
<requestHandler name="/selectItem" class="solr.SearchHandler" startup="lazy">
<lst name="defaults">
<str name="df">nom</str>
<str name="rows">100</str>
<str name="fl">*,score</str>
<str name="qf">nom^100</str>
<str name="sort">TYPE asc, score desc</str>
<double name="typeboost">1.0</double>
<str name="debugQuery">false</str>
</lst>
</requestHandler>
<requestHandler name="/store" class="solr.SearchHandler"
startup="lazy">
<lst name="defaults">
<str name="df">nom</str>
<str name="spellcheck.onlyMorePopular">false</str>
<str name="spellcheck.extendedResults">true</str>
<str name="spellcheck.collate">true</str>
<str name="spellcheck.count">1</str>
<str name="spellcheck">true</str>
<str name="defType">edismax</str>
<str name="rows">100</str>
<str name="sort">score desc</str>
<double name="typeboost">1.0</double>
<str name="debugQuery">false</str>
<str name="qf">nom^100 textphon^50</str>
<str name="facet">on</str>
<str name="facet.field">nom_manifestation</str>
<str name="facet.limit">-1</str>
<str name="hl.highlightMultiTerm">true</str>
<str name="hl.fragsize">200</str>
<str name="hl.snippets">200</str>
<!-- <str name="hl.fragmentsBuilder">colored</str> -->
<!-- <str name="hl.fragListBuilder">simple</str> -->
<str name="hl.fl">*</str>
<str name="hl.usePhraseHighlighter">true</str>
<str name="hl">true</str>
</lst>
<arr name="last-components">
<str>spellcheck</str>
</arr>
</requestHandler>
<searchComponent class="solr.SpellCheckComponent" name="suggest">
<lst name="spellchecker">
<str name="name">suggest</str>
<str name="classname">org.apache.solr.spelling.suggest.Suggester</str>
<str name="lookupImpl">org.apache.solr.spelling.suggest.tst.TSTLookup</str>
<!-- Alternatives to lookupImpl:
org.apache.solr.spelling.suggest.fst.FSTLookup [finite state automaton]
org.apache.solr.spelling.suggest.fst.WFSTLookupFactory [weighted finite state automaton]
org.apache.solr.spelling.suggest.jaspell.JaspellLookup [default, jaspell-based]
org.apache.solr.spelling.suggest.tst.TSTLookup [ternary trees]
-->
<str name="field">textng</str> <!-- the indexed field to derive suggestions from -->
<float name="threshold">0.005</float>
<!--str name="buildOnCommit">true</str-->
<!--
<str name="sourceLocation">american-english</str>
-->
</lst>
</searchComponent>
<requestHandler class="org.apache.solr.handler.component.SearchHandler" name="/suggest">
<lst name="defaults">
<str name="spellcheck">true</str>
<str name="spellcheck.dictionary">suggest</str>
<str name="spellcheck.onlyMorePopular">true</str>
<str name="spellcheck.count">5</str>
<str name="spellcheck.collate">true</str>
</lst>
<arr name="components">
<str>suggest</str>
</arr>
</requestHandler>
<!-- config for the admin interface -->
<admin>
<defaultQuery>solr</defaultQuery>
</admin>
</config>
最佳答案
您确定启动solr时没有出现其他错误吗？ Solr 在启动时读取 solr.xml、solrconfig.xml 和 schema.xml，如果这些文件有任何奇怪的地方，应该有日志中的其他错误。您可以重新启动服务器来确定吗？
我能想到的一件事是 solrconfig.xml 中的默认值，但错误消息会有所不同。我注意到您发布的架构中没有名为 content 的字段。然而，该字段用于 solr-home 骨架中。检查 solrconfig.xml 中是否存在类似的构造
<lst name="defaults">
// more defaults
<str name="df">content</str>
</lst>
如果是这种情况，启动时应该会出现警告。这可以解释为什么索引有效(您不依赖那里的默认值)但查询失败。
另一个想法。您是否以某种方式强化了您的 Servlet 容器？ Solr 经常使用 getClassLoader().getResource() 来查找文件。但如果是这样的话，错误应该会更多。
您可以在浏览器中查看架构(从下拉列表中选择核心，而不是架构)吗？
关于java - Solr找不到schema.xml，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/16040340/