ClassCastException on maven enhancing

Good day,

I have a maven build. When I run "mvn install" my unit tests run just
fine, as does the enhancer...
[INFO] --- openjpa-maven-plugin:1.1:enhance (enhancer) @ webdirectory ---
66 athome INFO [main] openjpa.Tool - Enhancer running on type
"ca.tnt.athome.Town".
190 athome INFO [main] openjpa.Tool - Enhancer running on type
"ca.tnt.athome.HouseListing".

But, when I run "mvn install tomcat:deploy", the enhancer plugin tries
to run again, and this...

[INFO] --- openjpa-maven-plugin:1.1:enhance (enhancer) @ webdirectory ---
An error occurred while attempting to determine the version of
"file:/home/trenta/LocalDocuments/development/java/athome/web-directory/target/classes/META-INF/persistence.xml".
[INFO]