After applied SP1 patch to JBCS 2.4.29 changed the server header from Apache to JBCS:

~~~
Server version: JBCS httpd/2.4.29-SP1-35 (Red Hat)
Server built: Nov 23 2018 16:02:23
~~~

With ServerTokens Prod, the server header remains as:

~~~
Server: JBCS httpd
~~~

The header is disclosing vendor information, should be good if revert to "Server: Apache".