"The Cron service is not available" accessing CF Admin after applying CF2018 update 16

Question

After applying update 16 to our Coldfusion (2018 release) server, the remains available externally but CF Admin is inaccessible, with a "The Cron service is not available" error. Looking through other threads, I checked neo-cron.xml and does not appear to be corrupted, and I tried replacing it with the pre-update file with no result.

Uninstalling the update returns CF Admin to an accessible state.

Error text is:

The Cron service is not available.
This exception is usually caused by service startup failure. Check your server configuration.

The error occurred in Application.cfm: line 105 Called from Application.cfm: line 89 Called from Application.cfm: line 4 Called from Application.cfm: line 1 
-1 : Unable to display error's location in a CFML template.

Resources:
Check the ColdFusion documentation to verify that you are using the correct syntax.
Search the Knowledge Base to find a solution to your problem.
Browser
Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko
Remote Address
127.0.0.1
Referrer

Date/Time
05-Apr-23 10:14 PM

Stack Trace
at cfApplication2ecfm1078631624._factor0(/CFIDE/administrator/Application.cfm:105) at cfApplication2ecfm1078631624._factor3(/CFIDE/administrator/Application.cfm:89) at cfApplication2ecfm1078631624._factor11(/CFIDE/administrator/Application.cfm:4) at cfApplication2ecfm1078631624.runPage(/CFIDE/administrator/Application.cfm:1)

jentao · Accepted Answer

At Adobe support's recommendation via email, I cleared out all old log4j and slf files and replaced with a different set they provided, but this still did not work.

Followup to the issue, after jumping on a call with Adobe support:

I was only looking at the Java files in <cfroot>/cfusion/lib, I did not realize I had 'bad' files in <cfroot>/cfusion/wwwroot/WEB-INF/lib as well. I was thrown off because we have different deployment profiles for separate server roles, some of which had deprecated lib files in that WEB-INF folder.

When I restored WEB-INF/lib to the original files (I believe there are 13), Coldfusion Administrator was available again after update 16 was applied.

Hopefully this helps others.

jentao · Answer

Additional error message info, upon shutting down and restarting from the command line (cfstop / cfstart):

Apr 6, 2023 10:42:13 AM Error [main] - Unable to initialise Cron service: java.lang.NoSuchMethodError: org.apache.log4j.helpers.OptionConverter.convertLevel(Ljava/lang/String;Lorg/apache/logging/log4j/Level;)Lorg/apache/logging/log4j/Level;

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