1、错误描述
java.lang.ClassCastException:java.math.BigDecimal cannot be cast to java.lang.String
2、错误原因
在hibernate映射文件中，数据库字段id是字符串类型，而在Java封装类中定义成java.math.BigDecimal，导致出错
3、解决办法
将Java封装类中的id属性修改成String类型
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