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The mappings from DB column types and Java types used in CMP or JPA entity classes is hard coded in netbeans. It would be useful to cusomize this. The selection of Java type can be based on DB column type, precision, scale, etc. (this is feedback from users sent to nbj2ee@netbeans.org)
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