The most recent version of the CmpVersionMappingService uses a CmpVersionUpdateInfo class. This package is in the com.deniz.jira.versioning.data package but is not exported in the OSGI manifest.
When plugins using the Java API try to use methods requiring CmpVersionUpdateInfo, the result is an OSGi exception:
Unable to resolve com.qlik.jira.product-component-versioning [294](R 294.0): missing requirement [com.qlik.jira.product-component-versioning [294](R 294.0)] osgi.wiring.package; (osgi.wiring.package=com.deniz.jira.versioning.data) Unresolved requirements: [[com.qlik.jira.product-component-versioning [294](R 294.0)] osgi.wiring.package; (osgi.wiring.package=com.deniz.jira.versioning.data)]. This error usually occurs when your plugin imports a package from another bundle with a specific version constraint and either the bundle providing that package doesn't meet those version constraints, or there is no bundle available that provides the specified package. For more details on how to fix this, see https://developer.atlassian.com/x/mQAN
See http://thestarware.com/api/cm/com/deniz/jira/versioning/data/package-summary.html
and the attached screenshot from the OSGI manager.