https://issues.apache.org/bugzilla/show_bug.cgi?id=56453

            Bug ID: 56453
           Summary: HSSFCellStyle getDataFormatStringCache must be used
                    synchronized
           Product: POI
           Version: 3.10
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: HSSF
          Assignee: [email protected]
          Reporter: [email protected]

getDataFormatString may return random results due to the unsynchronized usage
of the static fields lastDateFormat, lastFormats and getDataFormatStringCache.

The methods getDataFormatString and cloneStyleFrom should use

synchronized (HSSFCellStyle.class) {
...
}

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