https://access.redhat.com/webassets/avalon/d/red_hat_jboss_enterprise_application_platform/7.2/javadocs/org/hibernate/query/criteria/internal/path/MapKeyHelpers.html
MapKeyHelpers (Red Hat JBoss Enterprise Application Platform 7.2.0.GA public API)
red hat jboss
https://access.redhat.com/webassets/avalon/d/red_hat_jboss_enterprise_application_platform/7.3/javadocs/org/hibernate/query/criteria/internal/path/MapKeyHelpers.MapKeySource.html
MapKeyHelpers.MapKeySource (Red Hat JBoss Enterprise Application Platform 7.3.0.GA public API)