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

struts-user | Lukasz Lenart | 4 years ago
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    iteramos.com | 2 years ago
    java.lang.IllegalStateException: A book has a null property
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    gmane.org | 2 years ago
    java.lang.IllegalStateException: A book has a null property
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    efreedom.net | 2 years ago
    java.lang.IllegalStateException: A book has a null property

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    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at com.example.myproject.Book.getId()
    2. com.example.myproject
      Bootstrap.main
      1. com.example.myproject.Book.getId(Book.java:22)
      2. com.example.myproject.Author.getBookIds(Author.java:35)
      3. com.example.myproject.Bootstrap.main(Bootstrap.java:14)
      3 frames