关于json：UnrecognizedPropertyException：android中无法识别的字段错误

UnrecognizedPropertyException: Unrecognized field error in android

这是我的POJO课程。

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public class Product implements ParentListItem {
private String ProductName;
private int ProductID;
private String ProductImagePath;
private String BrandName;
private int BrandID;
private String SubCategoryName;
private int SubCategoryID;
private List<ProductVariant> Variants = new ArrayList<>();

Product(){}
}

Json格式：

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[{
"Variants": [{
"VariantID":"1",
"VariantName":"50 GM",
"VariantImagePath": null,
"MRP":"19.00",
"SellPrice":"18.24",
"InCart":"0"
}],
"ProductName":"Body Cleanser - Lemon Honey Kanti",
"ProductID":"1",
"BrandName":"Patanjali",
"SubCategoryID":"44",
"SubCategoryName":"Bathing Soap",
"ProductImagePath":"\/images\/patanjali\/1819.png",
"BrandID":"112"
}]

我试图像这样使用这个POJO。

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for (DataSnapshot postSnapshot : snapshot.getChildren()) {
Product product = postSnapshot.getValue(Product.class);
products.add(product);
}

但我得到这个错误：

Caused by:
com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException:
Unrecognized field"BrandID" (class com.example.sony.models.Product),
not marked as ignorable (9 known properties: ,"brandID",
"subCategoryName","productID","childItemList","variants",
"productImagePath","brandName","subCategoryID","productName"])

无法识别的字段"BrandID"，但此字段在POJO中可用。

我不明白为什么我的Capital案例字段会被转换成Smallcase？

为什么会出错？怎么解决这个问题？