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java.lang.NullPointerException at java.lang.String.compareTo(String.java:743) at java.lang.String.compareTo(String.java:792) at java.util.Arrays.mergeSort(Arrays.java:1124) at java.util.Arrays.mergeSort(Arrays.java:1132) at java.util.Arrays.mergeSort(Arrays.java:1131) at java.util.Arrays.mergeSort(Arrays.java:1131) at java.util.Arrays.mergeSort(Arrays.java:1131) at java.util.Arrays.sort(Arrays.java:1074) at EmployeeList.printEmployeesInOrder(EmployeeList.java:198) at FactorySystem.main(FactorySystem.java:57)