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XWiki Platform / cid:jira-generated-image-avatar-5bf0da84-9d50-447d-a2e6-6fee9db3bb1f XWIKI-23723 Open

A remote Solr core is broken if it's initialized on XWiki side while not fully initialized on Solr side
 
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Issue created

 
cid:jira-generated-image-avatar-94f5dedf-5ee6-4da3-9b9a-575ada521c67 Raluca Stavro created this issue on 17/Nov/25 16:39
 
Summary: SOLR is not initializing properly after restarting XWiki
Issue Type: cid:jira-generated-image-avatar-5bf0da84-9d50-447d-a2e6-6fee9db3bb1f Bug
Affects Versions: 14.10.20
Assignee: Unassigned
Components: Search - Solr
Created: 17/Nov/25 16:39
Priority: cid:jira-generated-image-static-major-aa005dec-c29e-4339-a807-51f1c88dc644 Major
Reporter: Raluca Stavro
Description:

The errors in the logs suggest that XWiki was restarted before SOLR finished loading : 

ERROR o.x.s.s.i.RemoteSolr           - Failed to create the Solr client for core with name [events]
org.xwiki.search.solr.SolrException: Failed to get the list of field types
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getFieldTypes(AbstractSolrCoreInitializer.java:176)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getFieldType(AbstractSolrCoreInitializer.java:399)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getVersion(AbstractSolrCoreInitializer.java:386)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getCurrentXWikiVersion(AbstractSolrCoreInitializer.java:362)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.initializeBaseSchema(AbstractSolrCoreInitializer.java:197)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.initialize(AbstractSolrCoreInitializer.java:160)
    at org.xwiki.search.solr.internal.AbstractSolr.getSynchronizedClient(AbstractSolr.java:95)
    at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1705)
    at org.xwiki.search.solr.internal.AbstractSolr.getClient(AbstractSolr.java:71)
    at org.xwiki.search.solr.internal.DefaultSolr.getClient(DefaultSolr.java:67)
    at org.xwiki.eventstream.store.solr.internal.SolrEventStore.initialize(SolrEventStore.java:159)
    at org.xwiki.component.embed.InitializableLifecycleHandler.handle(InitializableLifecycleHandler.java:39)
    at org.xwiki.component.embed.EmbeddableComponentManager.createInstance(EmbeddableComponentManager.java:365)
    at org.xwiki.component.embed.EmbeddableComponentManager.getComponentInstance(EmbeddableComponentManager.java:451)
    at org.xwiki.component.embed.EmbeddableComponentManager.getInstance(EmbeddableComponentManager.java:201)
    at org.xwiki.eventstream.internal.DefaultEventStore.initialize(DefaultEventStore.java:102)
    at org.xwiki.component.embed.InitializableLifecycleHandler.handle(InitializableLifecycleHandler.java:39)
    at org.xwiki.component.embed.EmbeddableComponentManager.createInstance(EmbeddableComponentManager.java:365)
    at org.xwiki.component.embed.EmbeddableComponentManager.getComponentInstance(EmbeddableComponentManager.java:451)
    at org.xwiki.component.embed.EmbeddableComponentManager.getInstance(EmbeddableComponentManager.java:201)
    at org.xwiki.component.embed.EmbeddableComponentManager.getDependencyInstance(EmbeddableComponentManager.java:406)
    at org.xwiki.component.embed.EmbeddableComponentManager.createInstance(EmbeddableComponentManager.java:355)
    at org.xwiki.component.embed.EmbeddableComponentManager.getComponentInstance(EmbeddableComponentManager.java:451)
    at org.xwiki.component.embed.EmbeddableComponentManager.getInstanceMap(EmbeddableComponentManager.java:242)
    at org.xwiki.component.embed.EmbeddableComponentManager.getInstanceList(EmbeddableComponentManager.java:225)
    at org.xwiki.observation.internal.DefaultObservationManager.initializeListeners(DefaultObservationManager.java:166)
    at org.xwiki.observation.internal.DefaultObservationManager.getListenersByEvent(DefaultObservationManager.java:132)
    at org.xwiki.observation.internal.DefaultObservationManager.notify(DefaultObservationManager.java:283)
    at org.xwiki.component.internal.StackingComponentEventManager.sendEvent(StackingComponentEventManager.java:151)
    at org.xwiki.component.internal.StackingComponentEventManager.flushEvents(StackingComponentEventManager.java:92)
    at org.xwiki.container.servlet.XWikiServletContextListener.contextInitialized(XWikiServletContextListener.java:133)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4494)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4946)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:683)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:658)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:662)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1184)
    at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1932)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:118)
    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1094)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:476)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1617)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:318)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
    at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:423)
    at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:366)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:893)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:795)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1328)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1318)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:866)
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:249)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:428)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:923)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:772)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:347)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:478)
Caused by: org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException: Error from server at _URL_/solr/xwiki_events: SolrCore is loading
    at org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:681)
    at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:266)
    at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:248)
    at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:214)
    at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:231)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getFieldTypes(AbstractSolrCoreInitializer.java:174)
    ... 71 common frames omitted
ERROR o.x.s.s.i.RemoteSolr           - Failed to create the Solr client for core with name [extension_index]
org.xwiki.search.solr.SolrException: Failed to get the list of field types
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getFieldTypes(AbstractSolrCoreInitializer.java:176)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getFieldType(AbstractSolrCoreInitializer.java:399)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getVersion(AbstractSolrCoreInitializer.java:386)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getCurrentXWikiVersion(AbstractSolrCoreInitializer.java:362)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.initializeBaseSchema(AbstractSolrCoreInitializer.java:197)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.initialize(AbstractSolrCoreInitializer.java:160)
    at org.xwiki.search.solr.internal.AbstractSolr.getSynchronizedClient(AbstractSolr.java:95)
    at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1705)
    at org.xwiki.search.solr.internal.AbstractSolr.getClient(AbstractSolr.java:71)
    at org.xwiki.search.solr.internal.DefaultSolr.getClient(DefaultSolr.java:67)
    at org.xwiki.extension.index.internal.ExtensionIndexStore.initialize(ExtensionIndexStore.java:176)
    at org.xwiki.component.embed.InitializableLifecycleHandler.handle(InitializableLifecycleHandler.java:39)
    at org.xwiki.component.embed.EmbeddableComponentManager.createInstance(EmbeddableComponentManager.java:365)
    at org.xwiki.component.embed.EmbeddableComponentManager.getComponentInstance(EmbeddableComponentManager.java:451)
    at org.xwiki.component.embed.EmbeddableComponentManager.getInstance(EmbeddableComponentManager.java:201)
    at org.xwiki.component.embed.EmbeddableComponentManager.getDependencyInstance(EmbeddableComponentManager.java:406)
    at org.xwiki.component.embed.EmbeddableComponentManager.createInstance(EmbeddableComponentManager.java:355)
    at org.xwiki.component.embed.EmbeddableComponentManager.getComponentInstance(EmbeddableComponentManager.java:451)
    at org.xwiki.component.embed.EmbeddableComponentManager.getInstanceMap(EmbeddableComponentManager.java:242)
    at org.xwiki.component.embed.EmbeddableComponentManager.getInstanceList(EmbeddableComponentManager.java:225)
    at org.xwiki.observation.internal.DefaultObservationManager.initializeListeners(DefaultObservationManager.java:166)
    at org.xwiki.observation.internal.DefaultObservationManager.getListenersByEvent(DefaultObservationManager.java:132)
    at org.xwiki.observation.internal.DefaultObservationManager.notify(DefaultObservationManager.java:283)
    at org.xwiki.component.internal.StackingComponentEventManager.sendEvent(StackingComponentEventManager.java:151)
    at org.xwiki.component.internal.StackingComponentEventManager.flushEvents(StackingComponentEventManager.java:92)
    at org.xwiki.container.servlet.XWikiServletContextListener.contextInitialized(XWikiServletContextListener.java:133)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4494)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4946)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:683)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:658)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:662)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1184)
    at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1932)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:118)
    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1094)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:476)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1617)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:318)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
    at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:423)
    at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:366)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:893)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:795)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1328)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1318)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:866)
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:249)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:428)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:923)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:772)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:347)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:478)
Caused by: org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException: Error from server at _URL_/solr/xwiki_extension_index: SolrCore is loading
    at org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:681)
    at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:266)
    at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:248)
    at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:214)
    at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:231)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getFieldTypes(AbstractSolrCoreInitializer.java:174)
    ... 66 common frames omitted

 

Before restarting XWiki, the cores were displayed, therefore the assumption that SOLR finished loading. In fact, the loading was still not finished, as shown in the logs above, suggesting that there is no way right now with SolrJ to make the different between requests indicating that the core is initializing and XWiki should wait a bit, and the actual failing requests.
 
 

3 updates

 
cid:jira-generated-image-avatar-94f5dedf-5ee6-4da3-9b9a-575ada521c67 Changes by Raluca Stavro on 17/Nov/25 16:40
 
Summary: SOLR is not initializing properly errors in the logs after restarting XWiki
Description: The After restrating SOLR and then XWiki, I noticed the following errors in the logs suggest that XWiki was restarted before SOLR finished loading :


{code:java}
ERROR o.x.s.s.i.RemoteSolr           - Failed to create the Solr client for core with name [events]
org.xwiki.search.solr.SolrException: Failed to get the list of field types
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getFieldTypes(AbstractSolrCoreInitializer.java:176)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getFieldType(AbstractSolrCoreInitializer.java:399)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getVersion(AbstractSolrCoreInitializer.java:386)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getCurrentXWikiVersion(AbstractSolrCoreInitializer.java:362)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.initializeBaseSchema(AbstractSolrCoreInitializer.java:197)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.initialize(AbstractSolrCoreInitializer.java:160)
    at org.xwiki.search.solr.internal.AbstractSolr.getSynchronizedClient(AbstractSolr.java:95)
    at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1705)
    at org.xwiki.search.solr.internal.AbstractSolr.getClient(AbstractSolr.java:71)
    at org.xwiki.search.solr.internal.DefaultSolr.getClient(DefaultSolr.java:67)
    at org.xwiki.eventstream.store.solr.internal.SolrEventStore.initialize(SolrEventStore.java:159)
    at org.xwiki.component.embed.InitializableLifecycleHandler.handle(InitializableLifecycleHandler.java:39)
    at org.xwiki.component.embed.EmbeddableComponentManager.createInstance(EmbeddableComponentManager.java:365)
    at org.xwiki.component.embed.EmbeddableComponentManager.getComponentInstance(EmbeddableComponentManager.java:451)
    at org.xwiki.component.embed.EmbeddableComponentManager.getInstance(EmbeddableComponentManager.java:201)
    at org.xwiki.eventstream.internal.DefaultEventStore.initialize(DefaultEventStore.java:102)
    at org.xwiki.component.embed.InitializableLifecycleHandler.handle(InitializableLifecycleHandler.java:39)
    at org.xwiki.component.embed.EmbeddableComponentManager.createInstance(EmbeddableComponentManager.java:365)
    at org.xwiki.component.embed.EmbeddableComponentManager.getComponentInstance(EmbeddableComponentManager.java:451)
    at org.xwiki.component.embed.EmbeddableComponentManager.getInstance(EmbeddableComponentManager.java:201)
    at org.xwiki.component.embed.EmbeddableComponentManager.getDependencyInstance(EmbeddableComponentManager.java:406)
    at org.xwiki.component.embed.EmbeddableComponentManager.createInstance(EmbeddableComponentManager.java:355)
    at org.xwiki.component.embed.EmbeddableComponentManager.getComponentInstance(EmbeddableComponentManager.java:451)
    at org.xwiki.component.embed.EmbeddableComponentManager.getInstanceMap(EmbeddableComponentManager.java:242)
    at org.xwiki.component.embed.EmbeddableComponentManager.getInstanceList(EmbeddableComponentManager.java:225)
    at org.xwiki.observation.internal.DefaultObservationManager.initializeListeners(DefaultObservationManager.java:166)
    at org.xwiki.observation.internal.DefaultObservationManager.getListenersByEvent(DefaultObservationManager.java:132)
    at org.xwiki.observation.internal.DefaultObservationManager.notify(DefaultObservationManager.java:283)
    at org.xwiki.component.internal.StackingComponentEventManager.sendEvent(StackingComponentEventManager.java:151)
    at org.xwiki.component.internal.StackingComponentEventManager.flushEvents(StackingComponentEventManager.java:92)
    at org.xwiki.container.servlet.XWikiServletContextListener.contextInitialized(XWikiServletContextListener.java:133)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4494)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4946)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:683)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:658)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:662)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1184)
    at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1932)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:118)
    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1094)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:476)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1617)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:318)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
    at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:423)
    at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:366)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:893)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:795)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1328)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1318)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:866)
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:249)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:428)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:923)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:772)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:347)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:478)
Caused by: org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException: Error from server at _URL_/solr/xwiki_events: SolrCore is loading
    at org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:681)
    at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:266)
    at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:248)
    at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:214)
    at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:231)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getFieldTypes(AbstractSolrCoreInitializer.java:174)
    ... 71 common frames omitted
ERROR o.x.s.s.i.RemoteSolr           - Failed to create the Solr client for core with name [extension_index]
org.xwiki.search.solr.SolrException: Failed to get the list of field types
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getFieldTypes(AbstractSolrCoreInitializer.java:176)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getFieldType(AbstractSolrCoreInitializer.java:399)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getVersion(AbstractSolrCoreInitializer.java:386)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getCurrentXWikiVersion(AbstractSolrCoreInitializer.java:362)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.initializeBaseSchema(AbstractSolrCoreInitializer.java:197)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.initialize(AbstractSolrCoreInitializer.java:160)
    at org.xwiki.search.solr.internal.AbstractSolr.getSynchronizedClient(AbstractSolr.java:95)
    at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1705)
    at org.xwiki.search.solr.internal.AbstractSolr.getClient(AbstractSolr.java:71)
    at org.xwiki.search.solr.internal.DefaultSolr.getClient(DefaultSolr.java:67)
    at org.xwiki.extension.index.internal.ExtensionIndexStore.initialize(ExtensionIndexStore.java:176)
    at org.xwiki.component.embed.InitializableLifecycleHandler.handle(InitializableLifecycleHandler.java:39)
    at org.xwiki.component.embed.EmbeddableComponentManager.createInstance(EmbeddableComponentManager.java:365)
    at org.xwiki.component.embed.EmbeddableComponentManager.getComponentInstance(EmbeddableComponentManager.java:451)
    at org.xwiki.component.embed.EmbeddableComponentManager.getInstance(EmbeddableComponentManager.java:201)
    at org.xwiki.component.embed.EmbeddableComponentManager.getDependencyInstance(EmbeddableComponentManager.java:406)
    at org.xwiki.component.embed.EmbeddableComponentManager.createInstance(EmbeddableComponentManager.java:355)
    at org.xwiki.component.embed.EmbeddableComponentManager.getComponentInstance(EmbeddableComponentManager.java:451)
    at org.xwiki.component.embed.EmbeddableComponentManager.getInstanceMap(EmbeddableComponentManager.java:242)
    at org.xwiki.component.embed.EmbeddableComponentManager.getInstanceList(EmbeddableComponentManager.java:225)
    at org.xwiki.observation.internal.DefaultObservationManager.initializeListeners(DefaultObservationManager.java:166)
    at org.xwiki.observation.internal.DefaultObservationManager.getListenersByEvent(DefaultObservationManager.java:132)
    at org.xwiki.observation.internal.DefaultObservationManager.notify(DefaultObservationManager.java:283)
    at org.xwiki.component.internal.StackingComponentEventManager.sendEvent(StackingComponentEventManager.java:151)
    at org.xwiki.component.internal.StackingComponentEventManager.flushEvents(StackingComponentEventManager.java:92)
    at org.xwiki.container.servlet.XWikiServletContextListener.contextInitialized(XWikiServletContextListener.java:133)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4494)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4946)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:683)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:658)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:662)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1184)
    at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1932)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:118)
    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1094)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:476)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1617)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:318)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
    at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:423)
    at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:366)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:893)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:795)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1328)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1318)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:866)
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:249)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:428)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:923)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:772)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:347)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:478)
Caused by: org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException: Error from server at _URL_/solr/xwiki_extension_index: SolrCore is loading
    at org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:681)
    at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:266)
    at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:248)
    at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:214)
    at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:231)
    at org.xwiki.search.solr.AbstractSolrCoreInitializer.getFieldTypes(AbstractSolrCoreInitializer.java:174)
    ... 66 common frames omitted{code}
 

Before restarting XWiki, the cores were displayed, therefore the assumption that SOLR finished loading. In fact, the loading was still not finished, as shown in the logs above, suggesting that there is no way right now with SolrJ to make the different between requests indicating that the core is initializing and XWiki should wait a bit, and the actual failing requests.
 
cid:jira-generated-image-avatar-94081ffb-956c-4059-bed5-7ec3e69fe935 Changes by Thomas Mortagne on 17/Nov/25 16:45
 
Summary: SOLR errors in the logs after restarting A remote Solr core is broken if it's initialized on XWiki side while not fully initialized on Solr side
 
 
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