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    Root Cause Analysis

    1. java.lang.NullPointerException

      null

      at com.school.service.StudentServiceImplementation.getSelectedStudents()
    2. com.school.service
      StudentServiceImplementation.getSelectedStudents
      1. com.school.service.StudentServiceImplementation.getSelectedStudents(StudentServiceImplementation.java:69)[classes/:na]
      1 frame
    3. Java RT
      NativeMethodAccessorImpl.invoke
      1. sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[na:1.8.0_77]
      2. sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)[na:1.8.0_77]
      2 frames