java.lang.IllegalStateException: A book has a null property

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via GitHub by roam
, 6 months ago
A book has a null property
via by Unknown author, 2 years ago
via GitHub by roam
, 2 years ago
A book has a null property
at com.example.myproject.Book.getId(
at com.example.myproject.Author.getBookIds(
at com.example.myproject.Bootstrap.main(

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