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https://issues.apache.org/jira/browse/SOLR-9497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15481903#comment-15481903
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Erick Erickson commented on SOLR-9497:
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First of all, please raise issues like this on the user's list first. Something
this blatant is very likely an issue with your setup or others would have run
into it before now.
In this case I suspect you have a mixture of old and new jars in your
classpath. Testing with a fresh install without any previous versions of Solr
would be a proverbial "smoking gun"...
> HttpSolrClient.Builder Returns Unusable Connection
> --------------------------------------------------
>
> Key: SOLR-9497
> URL: https://issues.apache.org/jira/browse/SOLR-9497
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: clients - java
> Affects Versions: 6.2
> Environment: Java 1.8 Mac OSX
> Reporter: Will McGinnis
> Labels: SolrJ
> Fix For: 6.1.1
>
>
> SolrClient solr = new HttpSolrClient.Builder(urlString).build();
> Exception in thread "main" java.lang.VerifyError: Bad return type
> Exception Details:
> Location:
>
> org/apache/solr/client/solrj/impl/HttpClientUtil.createClient(Lorg/apache/solr/common/params/SolrParams;Lorg/apache/http/conn/ClientConnectionManager;)Lorg/apache/http/impl/client/CloseableHttpClient;
> @58: areturn
> Reason:
> Type 'org/apache/http/impl/client/DefaultHttpClient' (current frame,
> stack[0]) is not assignable to
> 'org/apache/http/impl/client/CloseableHttpClient' (from method signature)
> Current Frame:
> bci: @58
> flags: { }
> locals: { 'org/apache/solr/common/params/SolrParams',
> 'org/apache/http/conn/ClientConnectionManager',
> 'org/apache/solr/common/params/ModifiableSolrParams',
> 'org/apache/http/impl/client/DefaultHttpClient' }
> stack: { 'org/apache/http/impl/client/DefaultHttpClient' }
> Bytecode:
> 0x0000000: bb00 0359 2ab7 0004 4db2 0005 b900 0601
> 0x0000010: 0099 001e b200 05bb 0007 59b7 0008 1209
> 0x0000020: b600 0a2c b600 0bb6 000c b900 0d02 002b
> 0x0000030: b800 104e 2d2c b800 0f2d b0
> Stackmap Table:
> append_frame(@47,Object[#143])
> at
> org.apache.solr.client.solrj.impl.HttpSolrClient.<init>(HttpSolrClient.java:209)
> at
> org.apache.solr.client.solrj.impl.HttpSolrClient$Builder.build(HttpSolrClient.java:874)
> I have tried upgrading to httpclient-4.5.2. This appears to create the same
> problem. For now, I use this deprecated, connection code.
> return new HttpSolrClient(urlString, new SystemDefaultHttpClient());
> Eventually, this hangs the Solr server, because you run out of file handles.
> I suspect calling solrClient.close() is doing nothing.
> I tried not closing and using a static connection to Solr.
> This results in basically, the same problem of, eventually hanging the Solr
> server.
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