错误信息如下：
Caused by: java.lang.ClassNotFoundException: solr.DataImportHandler
错误堆栈内容为：
null:org.apache.solr.common.SolrException: Error handling 'reload' action
at org.apache.solr.handler.admin.CoreAdminHandler.handleReloadAction(CoreAdminHandler.java:737)
at org.apache.solr.handler.admin.CoreAdminHandler.handleRequestInternal(CoreAdminHandler.java:225)
at org.apache.solr.handler.admin.CoreAdminHandler.handleRequestBody(CoreAdminHandler.java:188)
at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
at org.apache.solr.servlet.SolrDispatchFilter.handleAdminRequest(SolrDispatchFilter.java:729)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:258)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:207)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2466)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2455)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.solr.common.SolrException: Unable to reload core [bcodepot]
at org.apache.solr.core.CoreContainer.reload(CoreContainer.java:591)
at org.apache.solr.handler.admin.CoreAdminHandler.handleReloadAction(CoreAdminHandler.java:735)
... 23 more
Caused by: org.apache.solr.common.SolrException: RequestHandler init failure
at org.apache.solr.core.SolrCore.<init>(SolrCore.java:873)
at org.apache.solr.core.SolrCore.reload(SolrCore.java:429)
at org.apache.solr.core.CoreContainer.reload(CoreContainer.java:586)
... 24 more
Caused by: org.apache.solr.common.SolrException: RequestHandler init failure
at org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:172)
at org.apache.solr.core.SolrCore.<init>(SolrCore.java:792)
... 26 more
Caused by: org.apache.solr.common.SolrException: Error loading class 'solr.DataImportHandler'
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:490)
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:421)
at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:543)
at org.apache.solr.core.SolrCore.createRequestHandler(SolrCore.java:616)
at org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:158)
... 27 more
Caused by: java.lang.ClassNotFoundException: solr.DataImportHandler
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:789)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:274)
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:474)
... 31 more
上面显示的是错误信息。
解决办法
可以到 Solr 的 dist 目录下拷贝 solr-dataimporthandler-4.10.2.jar 和 solr-dataimporthandler-extras-4.10.2.jar 到你索引目录下的 lib 目录中。
如果没有 lib 目录，你可以创建一个。
