Spring MVC:The request sent by the client was syntactically incorrect

一般是由于参数类型不正确所致。比如表单如下：

<form:form action="" method="post" commandName="shop"><form:hidden path="id"/><form:input type="text" path="shopName" /><input type="submit" value="保存" /></form:form>

实体类如下：

public class ShopEntity {private ObjectId id;private String shopName;
}

当<form:hidden path="id"/>的值为空时，就会引发该错误，因为该表单项对应的值不是基本类型，而是一个ObjectId类型，null无法转成该类型。

改正办法：添加一个判断，只有id存在时才加载隐藏控件

 <c:if test="${shop.id!=null}"><form:hidden  path="id"/></c:if>

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