###struts模型驱动(必须new)可以封装【对象类型属性的属性】.页面传参错误致使的问题：HTTP Status 500 - could not execute statement;

问题详情：html HTTP Status 500 - could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement type Excep

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