java.lang.NullPointerException

Stack Overflow | Mike | 7 months ago
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Root Cause Analysis

  1. java.lang.NullPointerException

    No message provided

    at com.example.myproject.Book.getTitle()
  2. com.example.myproject
    Bootstrap.main
    1. com.example.myproject.Book.getTitle(Book.java:16)
    2. com.example.myproject.Author.getBookTitles(Author.java:25)
    3. com.example.myproject.Bootstrap.main(Bootstrap.java:14)
    3 frames