Sporadic Solr error while indexing
David Cook
Hi all,
Has anyone encountered the error ‘java.lang.ClassNotFoundException: solr.extraction.ExtractingRequestHandler’? I’ve included the full error at the bottom of this email.
I’m seeing it particularly with DSpace 4.1 and DSpace 4.4. However, it only happens when indexing some items…
I worked around it by updating solr/search/conf/solrconfig.xml.
I replaced:
class="solr.extraction.ExtractingRequestHandler"
With:
class="org.apache.solr.handler.extraction.ExtractingRequestHandler"
And I added:
<lib dir="../../lib" />
Underneath:
<lib dir="../../../contrib/extraction/lib" regex=".*\.jar" />
<lib dir="../../../dist/" regex="solr-cell-\d.*\.jar" />
<lib dir="../../../contrib/clustering/lib/" regex=".*\.jar" />
<lib dir="../../../dist/" regex="solr-clustering-\d.*\.jar" />
<lib dir="../../../contrib/langid/lib/" regex=".*\.jar" />
<lib dir="../../../dist/" regex="solr-langid-\d.*\.jar" />
<lib dir="../../../contrib/velocity/lib" regex=".*\.jar" />
<lib dir="../../../dist/" regex="solr-velocity-\d.*\.jar" />
I reloaded the Solr search core, and then everything was indexing once again! Items that weren’t appearing in DSpace were now appearing!
When I looked at “solr/#/search/plugins/queryhandler?entry=/update/extract,/update”, I noticed that /update/extract only had 208 requests… and I reckoned those were the 208 items that were creating errors before.
But… when I look at other DSpace instances I have which don’t have this error in their logs… I see that /update/extract isn’t even initialized on those DSpaces!
So I’m rather confused. I’ve resolved the error… but I don’t know *why* the error was happening in the first place.
2016-08-25 11:55:31,611 INFO org.apache.solr.update.processor.LogUpdateProcessor @ [search] webapp=/[dspace]solr path=/update params={wt=javabin&version=2} {deleteByQuery=handle:"1/13680" (-1543598381804290048)} 0 38
2016-08-25 11:55:31,852 ERROR org.apache.solr.servlet.SolrDispatchFilter @ null:org.apache.solr.common.SolrException: lazy loading error
at org.apache.solr.core.RequestHandlers$LazyRequestHandlerWrapper.getWrappedHandler(RequestHandlers.java:257)
at org.apache.solr.core.RequestHandlers$LazyRequestHandlerWrapper.handleRequest(RequestHandlers.java:239)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:1904)
at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:659)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:362)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:158)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.dspace.solr.filters.LocalHostRestrictionFilter.doFilter(LocalHostRestrictionFilter.java:50)
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:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.valves.RequestFilterValve.process(RequestFilterValve.java:305)
at org.apache.catalina.valves.RemoteAddrValve.invoke(RemoteAddrValve.java:83)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
at org.apache.tomcat.util.net.AprEndpoint$SocketWithOptionsProcessor.run(AprEndpoint.java:1770)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.solr.common.SolrException: Error loading class 'solr.extraction.ExtractingRequestHandler'
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:449)
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:381)
at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:530)
at org.apache.solr.core.SolrCore.createRequestHandler(SolrCore.java:603)
at org.apache.solr.core.RequestHandlers$LazyRequestHandlerWrapper.getWrappedHandler(RequestHandlers.java:248)
... 26 more
Caused by: java.lang.ClassNotFoundException: solr.extraction.ExtractingRequestHandler
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:793)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:278)
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:433)
... 30 more
David Cook
Systems Librarian
Prosentient Systems
72/330 Wattle St
Ultimo, NSW 2007
Australia
Office: 02 9212 0899
Direct: 02 8005 0595