but seemingly it does not have a value (yet) when your initialize method is being called. To solve this issue you will need to either initialize this data member (if a null state is invalid), or you can check whether it's null and only call setCellValueFactory if it's not null.
Maybe the investor id column is empty for some records in your XML.
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这是引发您错误的行：
将此数据成员声明为，
但在调用您的
初始化方法时，它似乎没有值（尚未）。要解决此问题，您将需要初始化此数据成员（如果null状态无效），或者您可以检查它是否是null，并且只有调用setCellvalueFactory如果不是null。也许投资者ID列为XML中的某些记录是空的。
This is the line which throws your error:
This data member is declared as
but seemingly it does not have a value (yet) when your
initializemethod is being called. To solve this issue you will need to either initialize this data member (if anullstate is invalid), or you can check whether it'snulland only callsetCellValueFactoryif it's notnull.Maybe the investor id column is empty for some records in your XML.