Hi Adobe, long time no see. 😁 I've encountered an issue that appears specific to CF-2021 Update 5. I've isolated the issue to this specific line in the fusebox 5 core code, line 250 is the line containing the xmlSearch() instruction:

<cfset fbCode = xmlParse(fbXML) />
				
				<!--- see if we need to re-read based on the encoding being different to our default --->
				<cfset encodings = xmlSearch(fbCode,"/fusebox/parameters/parameter[@name='characterEncoding']") />
				<cfif arrayLen(encodings) eq 1 and structKeyExists(encodings[1].xmlAttributes,"value")>

Here is the error:

Message:	coldfusion.runtime.CFPage.XmlSearch(Lcoldfusion/xml/XmlNodeList;Ljava/lang/String;)Ljava/lang/Object;
StackTrace:	java.lang.NoSuchMethodError: coldfusion.runtime.CFPage.XmlSearch(Lcoldfusion/xml/XmlNodeList;Ljava/lang/String;)Ljava/lang/Object; at cffuseboxApplication2ecfc905036032$funcRELOAD.runFunction(C:\fusebox_v5.5.1\fuseboxApplication.cfc:250) at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:623) at coldfusion.filter.SilentFilter.invoke(SilentFilter.java:47) at coldfusion.runtime.UDFMethod$ReturnTypeFilter.invoke(UDFMethod.java:553) at coldfusion.runtime.UDFMethod$ArgumentCollectionFilter.invoke(UDFMethod.java:516) at coldfusion.filter.FunctionAccessFilter.invoke(FunctionAccessFilter.java:95) at coldfusion.runtime.UDFMethod.runFilterChain(UDFMethod.java:463) at coldfusion.runtime.UDFMethod.runFilterChain(UDFMethod.java:438) at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:310) at coldfusion.runtime.CfJspPage._invokeUDF(CfJspPage.java:5011) at coldfusion.runtime.CfJspPage._invokeUDF(CfJspPage.java:4991) at cffuseboxApplication2ecfc905036032$funcINIT.runFunction(C:\fusebox_v5.5.1\fuseboxApplication.cfc:112) at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:623) at coldfusion.filter.SilentFilter.invoke(SilentFilter.java:47) at coldfusion.runtime.UDFMethod$ReturnTypeFilter.invoke(UDFMethod.java:553) at coldfusion.runtime.UDFMethod$ArgumentCollectionFilter.invoke(UDFMethod.java:516) at coldfusion.filter.FunctionAccessFilter.invoke(FunctionAccessFilter.java:95) at coldfusion.runtime.UDFMethod.runFilterChain(UDFMethod.java:463) at coldfusion.runtime.UDFMethod.runFilterChain(UDFMethod.java:438) at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:310) at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:975) at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:696) at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:503) at coldfusion.runtime.CfJspPage._invoke(CfJspPage.java:4254) at coldfusion.runtime.CfJspPage._invoke(CfJspPage.java:4217) at cfApplication2ecfc49315480$funcLOADFUSEBOX._factor4(C:\fusebox_v5.5.1\Application.cfc:345) at cfApplication2ecfc49315480$funcLOADFUSEBOX.runFunction(C:\fusebox_v5.5.1\Application.cfc:338) at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:623) at coldfusion.filter.SilentFilter.invoke(SilentFilter.java:47) at coldfusion.runtime.UDFMethod$ArgumentCollectionFilter.invoke(UDFMethod.java:516) at coldfusion.filter.FunctionAccessFilter.invoke(FunctionAccessFilter.java:95) at coldfusion.runtime.UDFMethod.runFilterChain(UDFMethod.java:463) at coldfusion.runtime.UDFMethod.runFilterChain(UDFMethod.java:438) at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:310) at coldfusion.runtime.CfJspPage._invokeUDF(CfJspPage.java:5011) at coldfusion.runtime.CfJspPage._invokeUDF(CfJspPage.java:4991) at cfApplication2ecfc49315480$funcONAPPLICATIONSTART.runFunction(C:\fusebox_v5.5.1\Application.cfc:85) at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:623) at coldfusion.filter.SilentFilter.invoke(SilentFilter.java:47) at coldfusion.runtime.UDFMethod$ArgumentCollectionFilter.invoke(UDFMethod.java:516) at coldfusion.filter.FunctionAccessFilter.invoke(FunctionAccessFilter.java:95) at coldfusion.runtime.UDFMethod.runFilterChain(UDFMethod.java:463) at coldfusion.runtime.UDFMethod.runFilterChain(UDFMethod.java:438) at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:310) at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:975) at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:696) at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:503) at coldfusion.runtime.AppEventInvoker.invoke(AppEventInvoker.java:115) at coldfusion.runtime.AppEventInvoker.onApplicationStart(AppEventInvoker.java:238) at coldfusion.filter.ApplicationFilter.invoke(ApplicationFilter.java:436) at coldfusion.filter.RequestMonitorFilter.invoke(RequestMonitorFilter.java:43) at coldfusion.filter.MonitoringFilter.invoke(MonitoringFilter.java:40) at coldfusion.filter.PathFilter.invoke(PathFilter.java:162) at coldfusion.filter.IpFilter.invoke(IpFilter.java:45) at coldfusion.filter.ExceptionFilter.invoke(ExceptionFilter.java:97) at coldfusion.filter.BrowserDebugFilter.invoke(BrowserDebugFilter.java:81) at coldfusion.filter.ClientScopePersistenceFilter.invoke(ClientScopePersistenceFilter.java:28) at coldfusion.filter.BrowserFilter.invoke(BrowserFilter.java:38) at coldfusion.filter.NoCacheFilter.invoke(NoCacheFilter.java:60) at coldfusion.filter.GlobalsFilter.invoke(GlobalsFilter.java:38) at coldfusion.filter.DatasourceFilter.invoke(DatasourceFilter.java:22) at coldfusion.filter.CachingFilter.invoke(CachingFilter.java:62) at coldfusion.CfmServlet.service(CfmServlet.java:231) at coldfusion.bootstrap.BootstrapServlet.service(BootstrapServlet.java:311) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at coldfusion.monitor.event.MonitoringServletFilter.doFilter(MonitoringServletFilter.java:46) at coldfusion.bootstrap.BootstrapFilter.doFilter(BootstrapFilter.java:47) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:377) at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:463) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:889) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1743) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:834)

If I rollback from Update 5 and return to Update 4, all works as it has for years on various CF versions and updates.

@Steve You need to clear the class files on disk after applying the update

Thanks for the quick response. I'm not seeing a clear class files within the CF admin cache section. Does unchecking "Save class files" clear this, or do I have to physically delete files somewhere?

Physically on disk like I said

Nice, that seemed to do the trick. For me, it was located here for anyone with a similar issue: C:\ColdFusion2021\cfusion\wwwroot\WEB-INF\cfclasses