Jasper & Groovy errors after migraation

I'm migration to 7.3.3 bonita to last one 7.11 and after the upgrade I detect 2 errors.

The first one is that in the new version there is no jasper connector library, I think this one is easy to fix but the second one is that one groovy script is failing.

groovy.lang.MissingMethodException: No signature of method: java.sql.Timestamp.toDate () is applicable for argument types: () values: []
Possible solutions: getDate (), setDate (int), updated (java.util.Map), format (java.lang.String), isCase (java.lang.Object), format (java.lang.String, java.util .TimeZone)

I understand the error but my question is more focused on understand how I should handle this migration error types?? Should I change the xml diagram directly???

Thank you very much

You can update your process in 7.3.3, to use java util date for instance. Once all cases are in the new version, do the migration.