https://access.redhat.com/webassets/avalon/d/red_hat_jboss_enterprise_application_platform/8.1/javadocs/org/hibernate/sql/results/graph/collection/internal/MapInitializerProducer.html
MapInitializerProducer (Red Hat JBoss Enterprise Application Platform 8.1.1.GA + JBoss EAP XP...
declaration: package: org.hibernate.sql.results.graph.collection.internal, class: MapInitializerProducer
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