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java.lang.NullPointerException: null at com.school.service.StudentServiceImplementation.getSelectedStudents(StudentServiceImplementation.java:69)[classes/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[na:1.8.0_77] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)[na:1.8.0_77]