新伺服器，部署專案，使用easyExcel功能匯出檔案時，報錯提示：Cannot load from short array because "sun.awt.FontConfiguration.head" is null，可以看到是字型檔案配置引發的空指標異常；
解決方法：登入伺服器，執行命令
yum install fontconfig
fc-cache --force
再重啟服務，再次匯出檔案，成功匯出
Cannot load from short array because "sun.awt.FontConfiguration.head" is null
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