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https://issues.apache.org/jira/browse/SOLR-6239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14970943#comment-14970943
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David Smiley commented on SOLR-6239:
------------------------------------
You are synchronizing on the "firstInstance" field, which will point to
Boolean.TRUE. You *really* shouldn't synchronize on that. Instead, create an
object just for synchronizing and then when you hold that luck, and only then,
should a firstInstance (primitive) boolean be examined. That fixes this
problem; although it's likely other simplifications could be done to clarify
the pattern here, which looks like just a simple thread-safe lazy init which
has been done before by many.
> HttpSolrServer: connection still allocated
> ------------------------------------------
>
> Key: SOLR-6239
> URL: https://issues.apache.org/jira/browse/SOLR-6239
> Project: Solr
> Issue Type: Bug
> Components: clients - java
> Affects Versions: 4.9
> Reporter: Sergio Fernández
> Priority: Minor
>
> In scenarios where concurrency is aggressive, this exception could easily
> appear:
> {quote}
> org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException: Invalid
> use of BasicClientConnManager: connection still allocated.
> Make sure to release the connection before allocating another one.
> at
> org.apache.solr.client.solrj.impl.HttpSolrServer.executeMethod(HttpSolrServer.java:554)
> ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
> at
> org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:210)
> ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
> at
> org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:206)
> ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
> at
> org.apache.solr.client.solrj.request.AbstractUpdateRequest.process(AbstractUpdateRequest.java:124)
> ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
> at org.apache.solr.client.solrj.SolrServer.add(SolrServer.java:116)
> ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
> at org.apache.solr.client.solrj.SolrServer.add(SolrServer.java:102)
> ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
> {quote}
> I wonder if there is any solution for it?
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