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Generally table names are plural for instance: apples, students, cars ... and also entity classes are singular Apple, Student, Car. Son entity class generator plugin should offer singular names. Like .dbml file generator in VisualStudio. It converts plural table names to singular entity names.
Created attachment 84815 [details] simple sample of singular className generation
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss