some tomcat-vault errors are ignored and not logged

1) Install tomcat and configure tomcat-vault per the documentation 2) Intentionally set a bad property substitution in an XML file (the vault block is missing below) $ tail -n2 conf/tomcat-users.xml <user username="tomcat" password="${VAULT::::password::}" roles="manager-gui"/> </tomcat-users> 3) An introspection error should occur and throw a IllegalArgumentException on line 283 . The exception is thrown, but the Digester in tomcat catches and ignores it leaving the property substitution incomplete here . 4) Observe that no error is logged but the substitution doesn't work. In my test that was proven because I couldn't login with the password stored in the vault.