Resolved [org.springframework.web.method.annotation.ModelAttributeMethodProcessor$1: org.springframework.validation.BeanPropertyBindingResult: 4 errors<EOL>Field error in object 'order' on field 'order_id': rejected value [null]; codes [typeMismatch.order.order_id,typeMismatch.order_id,typeMismatch.int,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [order.order_id,order_id]; arguments []; default message [order_id]]; default message [Failed to convert value of type 'null' to required type 'int'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [null] to type [int] for value [null]; nested exception is java.lang.IllegalArgumentException: A null value cannot be assigned to a primitive type]<EOL>Field error in object 'order' on field 'phone': rejected value [null]; codes [typeMismatch.order.phone,typeMismatch.phone,typeMismatch.int,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [order.phone,phone]; arguments []; default message [phone]]; default message [Failed to convert value of type 'null' to required type 'int'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [null] to type [int] for value [null]; nested exception is java.lang.IllegalArgumentException: A null value cannot be assigned to a primitive type]<EOL>Field error in object 'order' on field 'buy': rejected value [null]; codes [typeMismatch.order.buy,typeMismatch.buy,typeMismatch.int,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [order.buy,buy]; arguments []; default message [buy]]; default message [Failed to convert value of type 'null' to required type 'int'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [null] to type [int] for value [null]; nested exception is java.lang.IllegalArgumentException: A null value cannot be assigned to a primitive type]<EOL>Field error in object 'order' on field 'total': rejected value [null]; codes [typeMismatch.order.total,typeMismatch.total,typeMismatch.int,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [order.total,total]; arguments []; default message [total]]; default message [Failed to convert value of type 'null' to required type 'int'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [null] to type [int] for value [null]; nested excep

这段错误信息表明在订单管理系统中，有一个名为order的对象中的四个字段(order_id, phone, buy, total)未能成功转换为int类型，因为它们的值为null，而null值无法赋给原始类型(int)。因此，在处理这些字段之前，需要先确保它们都赋有适当的值。您可以通过在代码中添加一些空值检查或默认值来解决这个问题。另外，您还可以考虑使用Java类中的包装类型(Integer)来代替原始类型(int)，因为它们可以接受null值并且在使用时会更加灵活。

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