I get a java.lang.VerifyError: Cannot inherit from final class exception when executing HttpSolrClient solr = new HttpSolrClient("http://localhost:8983/solr/mycore");
I use SolrJ 5.5.0 with Java 1.7. Other than that I use commons-httpclient 3.1. This is the detailed error I get:
Handler processing failed; nested exception is java.lang.VerifyError: org/apache/http/params/SyncBasicHttpParams] with root cause
java.lang.VerifyError: org/apache/http/params/SyncBasicHttpParams
at org.apache.http.impl.client.DefaultHttpClient.createHttpParams(DefaultHttpClient.java:158)
at org.apache.http.impl.client.AbstractHttpClient.getParams(AbstractHttpClient.java:466)
at org.apache.solr.client.solrj.impl.HttpClientUtil.setFollowRedirects(HttpClientUtil.java:290)
at org.apache.solr.client.solrj.impl.HttpClientConfigurer.configure(HttpClientConfigurer.java:58)
at org.apache.solr.client.solrj.impl.HttpClientUtil.configureClient(HttpClientUtil.java:149)
at org.apache.solr.client.solrj.impl.HttpClientUtil.createClient(HttpClientUtil.java:125)
at org.apache.solr.client.solrj.impl.HttpSolrClient.<init>(HttpSolrClient.java:188)
at org.apache.solr.client.solrj.impl.HttpSolrClient.<init>(HttpSolrClient.java:161)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
There were 2 httpcore libs(httpcore 4.0 from axis2 1.6.2 and httpcore 4.4.1 from solrj 5.5.0) in my .m2 folder. Removing httpcore 4.0 helped me to fix the problem. The reason is org.apache.http.params.BasicHttpParams class in httpcore 4.0 is a final class.