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via Oracle Community by 807546, 1 year ago
java.lang.ClassCastException: cwrk2.Book	at cwrk2.Catalogue$Com_Util_ComParator.compare(Catalogue.java:73)	at java.util.Arrays.mergeSort(Arrays.java:1181)	at java.util.Arrays.sort(Arrays.java:1128)	at java.util.Collections.sort(Collections.java:121)