Hello Lutz
I’m not using the JasperReport CustomTag. Instead I use a customized solution to integrate JasperReports with my ColdFusion application. But I think the problem is the same since I got the same error message.
In Lucee 4.5 I put the JasperReports Jars in the WEB-INF/lucee/lib directory of the domain. With Lucee 5 I have to put the jars in the lib directory of the Lucee Installation.
Besides my Windows workstation I use JasperReports on several CentOS webservers.
I use the JasperReports Library 6.2.
On the Linux server I copy all the JasperReports jars in /opt/lucee/lib
Delete xercesImpl-2.10.0.jar
Add joda-time-2.4.jar (download from Joda - Time download | SourceForge.net )
Add mysql-connector-java-5.1.41-bin.jar (download from https://dev.mysql.com/downloads/connector/j/ )
Regards,
Christoph