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A generated JPA entity class has the following annotations: @Basic(optional = false) @NotNull Basic javadoc says: The use of the Basic annotation is optional for persistent fields and properties of these types. optional=false is made redundant by @NotNull. I recommend to remove this field to keep the generated entity clean.
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