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org.apache.solr.common.SolrException: Error Instantiating requestHandler, org.apache.solr.handler.dataimport.DataImportHandler failed to instantiate org.apache.solr.request.SolrRequestHandler at org.apache.solr.core.SolrCore.<init>(SolrCore.java:820) at org.apache.solr.core.SolrCore.<init>(SolrCore.java:659) at org.apache.solr.core.CoreContainer.create(CoreContainer.java:727) at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:447) at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:438) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor$1.run(ExecutorUtil.java:210) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745)Caused by: org.apache.solr.common.SolrException: Error Instantiating requestHandler, org.apache.solr.handler.dataimport.DataImportHandler failed to instantiate org.apache.solr.request.SolrRequestHandler at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:588) at org.apache.solr.core.PluginBag.createPlugin(PluginBag.java:122) at org.apache.solr.core.PluginBag.init(PluginBag.java:217) at org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:130) at org.apache.solr.core.SolrCore.<init>(SolrCore.java:773) ... 9 moreCaused by: java.lang.ClassCastException: class org.apache.solr.handler.dataimport.DataImportHandler at java.lang.Class.asSubclass(Class.java:3208) at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:475) at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:422) at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:567) ... 13 more