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    Initialize the variable before calling a method on it.

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Cannot invoke method abs() on null object

      at AbsolutelyGroovy.run()
    2. Unknown
      AbsolutelyGroovy.run
      1. AbsolutelyGroovy.run(AbsolutelyGroovy.groovy:7)
      1 frame
    3. IDEA
      AppMain.main
      1. com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
      1 frame