java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at com.example.myproject.Book.getTitle(Book.java:16)
at com.example.myproject.Author.getBookTitles(Author.java:25)
at com.example.myproject.Bootstrap.main(Bootstrap.java:14)

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