Hi, I'm getting error while starting up Solr 5.5 . I'm using jdk and CentOS 6.7. I'm setting up Solr for the first time, booting up with 2 shards. I've enabled the following entry in /bin/solr
if [ -e "$SOLR_HOME/knowledge/core.properties" ]; then CLOUD_MODE_OPTS+=('-Dbootstrap_confdir=./solr/knowledge/conf' 'collection.configName=myconf' '-DnumShards=2') fi When I start solr through linux service, everything seems to be fine till I hit the following exception. [2016-03-17 20:23:34,760]ERROR 9350[coreLoadExecutor-7-thread-1-processing-n:54.176.219.134:8983_solr] - org.apache.solr.core.CoreContainer.create(CoreContainer.java:827) - Error creating core [knowledge]: org/simpleframework/xml/core/Persister org.apache.solr.common.SolrException: org/simpleframework/xml/core/Persister at org.apache.solr.core.SolrCore.<init>(SolrCore.java:820) at org.apache.solr.core.SolrCore.<init>(SolrCore.java:658) at org.apache.solr.core.CoreContainer.create(CoreContainer.java:814) at org.apache.solr.core.CoreContainer.access$000(CoreContainer.java:87) at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:467) at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:458) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor$1.run(ExecutorUtil.java:231) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.NoClassDefFoundError: org/simpleframework/xml/core/Persister at org.carrot2.util.attribute.AttributeValueSets.deserialize(AttributeValueSets.java:309) at org.apache.solr.handler.clustering.carrot2.CarrotClusteringEngine.init(CarrotClusteringEngine.java:157) at org.apache.solr.handler.clustering.ClusteringComponent.inform(ClusteringComponent.java:117) at org.apache.solr.core.SolrResourceLoader.inform(SolrResourceLoader.java:697) at org.apache.solr.core.SolrCore.<init>(SolrCore.java:800) ... 10 more Caused by: java.lang.ClassNotFoundException: org.simpleframework.xml.core.Persister at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:450) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:403) ... 15 more [2016-03-17 20:23:34,763]ERROR 9353[coreContainerWorkExecutor-2-thread-1-processing-n:54.176.219.134:8983_solr] - org.apache.solr.core.CoreContainer$2.run(CoreContainer.java:500) - Error waiting for SolrCore to be created java.util.concurrent.ExecutionException: org.apache.solr.common.SolrException: Unable to create core [knowledge] at java.util.concurrent.FutureTask.report(FutureTask.java:122) at java.util.concurrent.FutureTask.get(FutureTask.java:192) at org.apache.solr.core.CoreContainer$2.run(CoreContainer.java:496) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor$1.run(ExecutorUtil.java:231) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: org.apache.solr.common.SolrException: Unable to create core [knowledge] at org.apache.solr.core.CoreContainer.create(CoreContainer.java:828) at org.apache.solr.core.CoreContainer.access$000(CoreContainer.java:87) at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:467) at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:458) ... 5 more Caused by: org.apache.solr.common.SolrException: org/simpleframework/xml/core/Persister at org.apache.solr.core.SolrCore.<init>(SolrCore.java:820) at org.apache.solr.core.SolrCore.<init>(SolrCore.java:658) at org.apache.solr.core.CoreContainer.create(CoreContainer.java:814) ... 8 more Caused by: java.lang.NoClassDefFoundError: org/simpleframework/xml/core/Persister at org.carrot2.util.attribute.AttributeValueSets.deserialize(AttributeValueSets.java:309) at org.apache.solr.handler.clustering.carrot2.CarrotClusteringEngine.init(CarrotClusteringEngine.java:157) at org.apache.solr.handler.clustering.ClusteringComponent.inform(ClusteringComponent.java:117) at org.apache.solr.core.SolrResourceLoader.inform(SolrResourceLoader.java:697) at org.apache.solr.core.SolrCore.<init>(SolrCore.java:800) ... 10 more Caused by: java.lang.ClassNotFoundException: org.simpleframework.xml.core.Persister at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:450) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:403) ... 15 more Looks like it's missing the reference of simple-xml jar. I've been using Solr 5.0 till now, never see this error on startup. Do I need to copy this jar in lib? Any pointers will be appreciated. -Thanks, Shamik