'for each' statements are only available if source level is 1.5 or greater

I've upgraded 2 systems from Tomcat 8.5.11 to Tomcat 10.1.13. The first system
was done a couple of years ago and runs just fine.

I've just upgraded the 2nd system which is not running just fine. I've been working
on this for a week. When I run it I get numerous errors related to "source level
is 1.5 or greater."

when I run tomcat I get:

Using CATALINA_HOME:   /srv/tomcat
Using CATALINA_TMPDIR: /srv/tomcat/temp
Using JRE_HOME:        /user/util/src/jdk-17.0.8
Using CLASSPATH:      /srv/tomcat/bin/bootstrap.jar:/srv/tomcat/bin/tomcat-juli.jar

The libs on the non-running system are basically the same as on the running
system except some are newer versions.  I can post the differences if that would
help. 

I've compared the $CATALINA_HOME/conf files between systems and I don't see any
meaningful differences.

I've tried changing https://jakarta.ee/xml/ns/jakartaee/web-app_6_0.xsd to 
https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd (which is one difference).
That didn't help.

I've tried explicitly setting the compilerSourceVM to 11. That didn't help.

What can I look at to find this problem and fix it?

Thanks --Mark