Caused by: java.lang.ClassCastException: org.apache.poi.hssf.record.UnknownRecord cannot be cast to org.apache.poi.hssf.record.ExtendedFormatRecord
Caused by: java.lang.ClassCastException: org.apache.poi.hssf.record.UnknownRecord cannot be cast to org.apache.poi.hssf.record.ExtendedFormatRecord
这种偶然发生的,大多与多线程并发有关系,最后仔细检查,对操作的Workbook进行同步控制,就没出现这种问题了