Hello Team, I am using Solr 8.5.0 and here is the full log for the error which I am getting:
SolrConfigHandler Error checking plugin : => org.apache.solr.common.SolrException: Error loading class 'solr.VelocityResponseWriter' @400000005ec3702b3710a43c at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:570) @400000005ec3702b3710a824 org.apache.solr.common.SolrException: Error loading class 'solr.VelocityResponseWriter' @400000005ec3702b3710ac0c at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:570) ~[?:?] @400000005ec3702b3710f25c at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:501) ~[?:?] @400000005ec3702b3710f644 at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:824) ~[?:?] @400000005ec3702b3710f644 at org.apache.solr.core.SolrCore.createInitInstance(SolrCore.java:880) ~[?:?] @400000005ec3702b3710fa2c at org.apache.solr.handler.SolrConfigHandler$Command.verifyClass(SolrConfigHandler.java:601) ~[?:?] @400000005ec3702b371105e4 at org.apache.solr.handler.SolrConfigHandler$Command.updateNamedPlugin(SolrConfigHandler.java:565) ~[?:?] @400000005ec3702b371105e4 at org.apache.solr.handler.SolrConfigHandler$Command.handleCommands(SolrConfigHandler.java:502) ~[?:?] @400000005ec3702b3711196c at org.apache.solr.handler.SolrConfigHandler$Command.handlePOST(SolrConfigHandler.java:363) ~[?:?] @400000005ec3702b3711196c at org.apache.solr.handler.SolrConfigHandler$Command.access$100(SolrConfigHandler.java:161) ~[?:?] @400000005ec3702b37111d54 at org.apache.solr.handler.SolrConfigHandler.handleRequestBody(SolrConfigHandler.java:139) ~[?:?] @400000005ec3702b3711213c at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:211) ~[?:?] @400000005ec3702b3711290c at org.apache.solr.core.SolrCore.execute(SolrCore.java:2596) ~[?:?] @400000005ec3702b37112cf4 at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:802) ~[?:?] @400000005ec3702b37112cf4 at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:579) ~[?:?] @400000005ec3702b371130dc at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:420) ~[?:?] @400000005ec3702b37115404 at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:352) ~[?:?] @400000005ec3702b371157ec at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1596) ~[jetty-servlet-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b371157ec at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:545) ~[jetty-servlet-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711678c at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711678c at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:590) ~[jetty-security-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b37116b74 at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b37117344 at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711772c at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1607) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b37117b14 at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b371182e4 at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1297) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b37119284 at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b37119284 at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:485) ~[jetty-servlet-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711966c at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1577) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711a224 at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711a60c at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1212) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711a9f4 at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711b1c4 at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:221) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711b1c4 at org.eclipse.jetty.server.handler.InetAccessHandler.handle(InetAccessHandler.java:177) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711c164 at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:146) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711c164 at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711c54c at org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:322) ~[jetty-rewrite-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711cd1c at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711d104 at org.eclipse.jetty.server.Server.handle(Server.java:500) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711d4ec at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711dcbc at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:547) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711f42c at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711f814 at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:270) ~[jetty-server-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3711f814 at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) ~[jetty-io-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b371203cc at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) ~[jetty-io-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b371203cc at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117) ~[jetty-io-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b371207b4 at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336) ~[jetty-util-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b37120f84 at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313) ~[jetty-util-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b3712136c at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171) ~[jetty-util-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b37121f24 at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129) ~[jetty-util-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b37121f24 at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:388) ~[jetty-util-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b37122adc at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806) ~[jetty-util-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b37122adc at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938) ~[jetty-util-9.4.24.v20191120.jar:9.4.24.v20191120] @400000005ec3702b37123694 at java.lang.Thread.run(Thread.java:745) [?:1.8.0_66] @400000005ec3702b37123694 Caused by: java.lang.ClassNotFoundException: solr.VelocityResponseWriter @400000005ec3702b37123a7c at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[?:1.8.0_66] @400000005ec3702b37123a7c at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_66] @400000005ec3702b3712424c at java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:814) ~[?:1.8.0_66] @400000005ec3702b371251ec at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_66] @400000005ec3702b371255d4 at java.lang.Class.forName0(Native Method) ~[?:1.8.0_66] @400000005ec3702b371255d4 at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_66] @400000005ec3702b371259bc at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:554) ~[?:?] @400000005ec3702b371259bc ... 52 more @400000005ec3702b3712618c 2020-05-19 05:35:29.921 ERROR (qtp836220863-14) [ x:partinterchange] o.a.s.h.SolrConfigHandler ERROR:[{ @400000005ec3702b37126574 "update-queryresponsewriter":{ @400000005ec3702b37126574 "startup":"lazy", @400000005ec3702b37126574 "name":"velocity", @400000005ec3702b3712695c "class":"solr.VelocityResponseWriter", @400000005ec3702b3712695c "template.base.dir":"", @400000005ec3702b3712695c "solr.resource.loader.enabled":"true", @400000005ec3702b3712712c "params.resource.loader.enabled":"true"}, @400000005ec3702b37127514 "errorMessages":["Error loading class 'solr.VelocityResponseWriter'"]}] P.S. *I am getting this error after I have commented out the <lib> directives for velocity and the /browse request handler as well as the following line:* <queryResponseWriter name="velocity" class="solr.VelocityResponseWriter" startup="lazy"> <str name="template.base.dir">${velocity.template.base.dir:}</str> </queryResponseWriter> -- Kind Regards, Prakhar Kumar Sr. Enterprise Software Engineer *HotWax Systems* *Enterprise open source experts* cell: +91-89628-81820 office: 0731-409-3684 http://www.hotwaxsystems.com