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https://issues.apache.org/jira/browse/SOLR-6239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14970976#comment-14970976
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David Smiley commented on SOLR-6239:
------------------------------------
N/P. Technically one synchronizes on a specific instance of an object. A
field or variable is simply a pointer to a an object. The primitive "true"
resolves to Boolean.TRUE when assigned to a Boolean variable. Given that
Boolean.TRUE is a global object instance that comes with the JDK; it's a
terrible choice to synchronize on.
> 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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