Some research, line 768 of ConcurrentHashMap:
int hash = hash(key.hashCode());
I believe we have Unit Test with null as a key very strange for Solr cache
implementation
/**
* Returns the value to which the specified key is mapped,
* or {@code null} if this map contains no mapping for the key.
*
* <p>More formally, if this map contains a mapping from a key
* {@code k} to a value {@code v} such that {@code key.equals(k)},
* then this method returns {@code v}; otherwise it returns
* {@code null}. (There can be at most one such mapping.)
*
* @throws NullPointerException if the specified key is null
*/
public V get(Object key) {
int hash = hash(key.hashCode());
return segmentFor(hash).get(key, hash);
}
From: Fuad Efendi <f...@efendi.ca>
Reply-To: lucene-dev <dev@lucene.apache.org>
Date: Monday, 18 June, 2012 11:45 AM
To: lucene-dev <dev@lucene.apache.org>
Subject: Solr - ConcurrentHashMap - NullPointerException
I am recalling big noise in JIRA; and Paul Nobble implemented first version
of this what can be wrong now, after few years? Solr 3.6.0
Jun 18, 2012 3:40:43 PM org.apache.solr.common.SolrException log
SEVERE: java.lang.NullPointerException
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
at org.apache.solr.util.ConcurrentLRUCache.get(ConcurrentLRUCache.java:87)
at org.apache.solr.search.FastLRUCache.get(FastLRUCache.java:136)
at
org.apache.solr.search.SolrIndexSearcher.getPositiveDocSet(SolrIndexSearcher
.java:632)
at
org.apache.solr.search.SolrIndexSearcher.numDocs(SolrIndexSearcher.java:1743
)
at
org.apache.solr.request.SimpleFacets.getFacetQueryCounts(SimpleFacets.java:2
34)
at
org.apache.solr.request.SimpleFacets.getFacetCounts(SimpleFacets.java:194)
at
org.apache.solr.handler.component.FacetComponent.process(FacetComponent.java
:72)
at
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHand
ler.java:186)
at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.
java:129)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:1376)
at
org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:3
65)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:
260)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:235)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
va:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja
va:191)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127
)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102
)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java
:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http
11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:680)
Fuad Efendi
416-993-2060
http://www.tokenizer.ca
