Information about Training about XWiki Development Process

org.xwiki.rendering.RenderingException: Failed to execute renderer
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.syncRender(DefaultAsyncRendererExecutor.java:287)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.render(DefaultAsyncRendererExecutor.java:267)
 at org.xwiki.rendering.async.internal.block.DefaultBlockAsyncRendererExecutor.render(DefaultBlockAsyncRendererExecutor.java:154)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:869)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:831)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:818)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.renderNoException(InternalTemplateManager.java:773)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.renderNoException(InternalTemplateManager.java:765)
 at com.xpn.xwiki.internal.template.DefaultTemplateManager.renderNoException(DefaultTemplateManager.java:79)
 at com.xpn.xwiki.internal.template.DefaultTemplateManager.renderNoException(DefaultTemplateManager.java:73)
 at org.xwiki.template.script.TemplateScriptService.render(TemplateScriptService.java:54)
 at jdk.internal.reflect.GeneratedMethodAccessor10251.invoke(Unknown Source)
 at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.base/java.lang.reflect.Method.invoke(Method.java:569)
 at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:571)
 at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:554)
 at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:221)
 at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:368)
 at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:492)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
 at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:217)
 at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:331)
 at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:261)
 at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:304)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
 at org.apache.velocity.Template.merge(Template.java:358)
 at org.apache.velocity.Template.merge(Template.java:262)
 at org.xwiki.velocity.internal.InternalVelocityEngine.evaluate(InternalVelocityEngine.java:233)
 at com.xpn.xwiki.internal.template.VelocityTemplateEvaluator.evaluateContent(VelocityTemplateEvaluator.java:107)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.evaluateContent(TemplateAsyncRenderer.java:219)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.renderVelocity(TemplateAsyncRenderer.java:174)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:135)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:54)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.lambda$syncRender$0(DefaultAsyncRendererExecutor.java:284)
 at com.xpn.xwiki.internal.security.authorization.DefaultAuthorExecutor.call(DefaultAuthorExecutor.java:98)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.syncRender(DefaultAsyncRendererExecutor.java:284)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.render(DefaultAsyncRendererExecutor.java:267)
 at org.xwiki.rendering.async.internal.block.DefaultBlockAsyncRendererExecutor.render(DefaultBlockAsyncRendererExecutor.java:154)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:869)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:831)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:818)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.renderNoException(InternalTemplateManager.java:773)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.renderNoException(InternalTemplateManager.java:765)
 at com.xpn.xwiki.internal.template.DefaultTemplateManager.renderNoException(DefaultTemplateManager.java:79)
 at com.xpn.xwiki.internal.template.DefaultTemplateManager.renderNoException(DefaultTemplateManager.java:73)
 at org.xwiki.template.script.TemplateScriptService.render(TemplateScriptService.java:54)
 at jdk.internal.reflect.GeneratedMethodAccessor10251.invoke(Unknown Source)
 at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.base/java.lang.reflect.Method.invoke(Method.java:569)
 at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:571)
 at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:554)
 at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:221)
 at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:368)
 at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:492)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
 at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:217)
 at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:331)
 at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:261)
 at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:304)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
 at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:190)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
 at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:190)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
 at org.apache.velocity.Template.merge(Template.java:358)
 at org.apache.velocity.Template.merge(Template.java:262)
 at org.xwiki.velocity.internal.InternalVelocityEngine.evaluate(InternalVelocityEngine.java:233)
 at com.xpn.xwiki.internal.template.VelocityTemplateEvaluator.evaluateContent(VelocityTemplateEvaluator.java:107)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.evaluateContent(TemplateAsyncRenderer.java:219)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.renderVelocity(TemplateAsyncRenderer.java:174)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:135)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:54)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.lambda$syncRender$0(DefaultAsyncRendererExecutor.java:284)
 at com.xpn.xwiki.internal.security.authorization.DefaultAuthorExecutor.call(DefaultAuthorExecutor.java:98)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.syncRender(DefaultAsyncRendererExecutor.java:284)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.render(DefaultAsyncRendererExecutor.java:267)
 at org.xwiki.rendering.async.internal.block.DefaultBlockAsyncRendererExecutor.render(DefaultBlockAsyncRendererExecutor.java:154)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:869)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:831)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:811)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:797)
 at com.xpn.xwiki.internal.template.DefaultTemplateManager.render(DefaultTemplateManager.java:91)
 at com.xpn.xwiki.internal.template.DefaultTemplateManager.render(DefaultTemplateManager.java:85)
 at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:2552)
 at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:180)
 at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:651)
 at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:339)
 at com.xpn.xwiki.web.LegacyActionServlet.service(LegacyActionServlet.java:111)
 at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:138)
 at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:123)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:162)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:138)
 at org.xwiki.wysiwyg.filter.ConversionFilter.doFilter(ConversionFilter.java:71)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:162)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:138)
 at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:162)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:138)
 at org.xwiki.container.servlet.filters.internal.SetHTTPHeaderFilter.doFilter(SetHTTPHeaderFilter.java:66)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:162)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:138)
 at org.xwiki.resource.servlet.RoutingFilter.doFilter(RoutingFilter.java:135)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:162)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:138)
 at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:212)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:162)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:138)
 at org.xwiki.container.servlet.filters.internal.SafeRedirectFilter.doFilter(SafeRedirectFilter.java:106)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:162)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:138)
 at org.xwiki.container.servlet.filters.internal.ResolveRelativeRedirectFilter.doFilter(ResolveRelativeRedirectFilter.java:129)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:162)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:138)
 at org.xwiki.container.servlet.filters.internal.SourceURLResolverFilter.doFilter(SourceURLResolverFilter.java:177)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:162)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:138)
 at org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:120)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:162)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:138)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:165)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:88)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:492)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:113)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:83)
 at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:733)
 at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:654)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:72)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
 at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399)
 at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
 at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:903)
 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1775)
 at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
 at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:973)
 at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:491)
 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
 at java.base/java.lang.Thread.run(Thread.java:840)
Caused by: org.xwiki.rendering.RenderingException: Failed to evaluate template with id [environment:/templates/informationinline.vm]
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.evaluateContent(TemplateAsyncRenderer.java:221)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.renderVelocity(TemplateAsyncRenderer.java:174)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:135)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:54)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.lambda$syncRender$0(DefaultAsyncRendererExecutor.java:284)
 at com.xpn.xwiki.internal.security.authorization.DefaultAuthorExecutor.call(DefaultAuthorExecutor.java:98)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.syncRender(DefaultAsyncRendererExecutor.java:284)
 ... 140 more
Caused by: org.xwiki.velocity.XWikiVelocityException: Failed to evaluate content with namespace [environment:/skins/flamingo/view.vm]
 at org.xwiki.velocity.internal.InternalVelocityEngine.evaluate(InternalVelocityEngine.java:235)
 at com.xpn.xwiki.internal.template.VelocityTemplateEvaluator.evaluateContent(VelocityTemplateEvaluator.java:107)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.evaluateContent(TemplateAsyncRenderer.java:219)
 ... 146 more
Caused by: org.apache.velocity.exception.MethodInvocationException: Invocation of method 'getBacklinks' in  class com.xpn.xwiki.api.Document threw exception com.xpn.xwiki.XWikiException: Error number 0 in 0: Failed to load backlinks for reference [xwiki:Blog.XWikiDevelopmentProcessTraining] at environment:/templates/informationinline.vm[line 179, column 29]
 at org.apache.velocity.runtime.parser.node.ASTIdentifier.execute(ASTIdentifier.java:246)
 at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:368)
 at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:704)
 at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:75)
 at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:242)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
 at org.apache.velocity.runtime.parser.node.ASTStringLiteral.value(ASTStringLiteral.java:320)
 at org.apache.velocity.runtime.parser.node.ASTMap.value(ASTMap.java:84)
 at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:75)
 at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:167)
 at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:368)
 at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:704)
 at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:75)
 at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:242)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
 at org.apache.velocity.Template.merge(Template.java:358)
 at org.apache.velocity.Template.merge(Template.java:262)
 at org.xwiki.velocity.internal.InternalVelocityEngine.evaluate(InternalVelocityEngine.java:233)
 ... 148 more
Caused by: com.xpn.xwiki.XWikiException: Error number 0 in 0: Failed to load backlinks for reference [xwiki:Blog.XWikiDevelopmentProcessTraining]
 at com.xpn.xwiki.doc.XWikiDocument.getBackLinkedReferences(XWikiDocument.java:5739)
 at com.xpn.xwiki.doc.XWikiDocument.getBackLinkedPages(XWikiDocument.java:5765)
 at com.xpn.xwiki.api.Document.getBacklinks(Document.java:2456)
 at jdk.internal.reflect.GeneratedMethodAccessor1397.invoke(Unknown Source)
 at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.base/java.lang.reflect.Method.invoke(Method.java:569)
 at org.apache.velocity.runtime.parser.node.PropertyExecutor.execute(PropertyExecutor.java:159)
 at org.apache.velocity.util.introspection.UberspectImpl$VelGetterImpl.invoke(UberspectImpl.java:722)
 at org.apache.velocity.runtime.parser.node.ASTIdentifier.execute(ASTIdentifier.java:217)
 ... 165 more
Caused by: org.xwiki.link.LinkException: Failed to search Solr for the backlinks of an entity
 at org.xwiki.search.solr.internal.metadata.DefaultLinkStore.resolveBackLinkedEntities(DefaultLinkStore.java:182)
 at com.xpn.xwiki.doc.XWikiDocument.getBackLinkedReferences(XWikiDocument.java:5737)
 ... 173 more
Caused by: java.lang.IllegalStateException: Connection pool shut down
 at org.apache.http.util.Asserts.check(Asserts.java:34)
 at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.requestConnection(PoolingHttpClientConnectionManager.java:269)
 at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:176)
 at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186)
 at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
 at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
 at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
 at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
 at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
 at org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:603)
 at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:263)
 at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:244)
 at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:234)
 at org.apache.solr.client.solrj.SolrClient.query(SolrClient.java:926)
 at org.apache.solr.client.solrj.SolrClient.query(SolrClient.java:939)
 at org.xwiki.search.solr.internal.metadata.DefaultLinkStore.resolveBackLinkedEntities(DefaultLinkStore.java:180)
 ... 174 more