关于java：spring mvc、ajax中客户端发送的请求语法错误

The request sent by the client was syntactically incorrect in spring mvc, ajax

下面是对我的控制器的 ajax 调用

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$(‘#submitButton’).on(‘click’, function() {
var expenseDetailsListVO = {};
expenseDetailsListVO = getData();
console.log(expenseDetailsListVO);
var data = JSON.stringify(expenseDetailsListVO);
console.log(data);
$.ajax({
url :“${pageContext.request.contextPath}/saveExpenses”,
data : data,
method : ‘POST’,
contentType :“application/json”,
success : function(data) {

},
error : function(data) {

}
});
});

这是我的控制器

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@RequestMapping (value =“/saveExpenses”, method=RequestMethod.POST)
public String saveExpenses (@RequestBody(required=false) ExpenseDetailsListVO expenseDetailsListVO, Model model) {

//System.out.println(“User Id is……..”+userId);
System.out.println(expenseDetailsListVO);
ExpenseDetailsList expenseDetailsList = MapperUtil.convertExpenseListVOToDO(expenseDetailsListVO);

//expenseServiceManagement.addExpense(expenseDetailsList);

return“addExpense”;
}

下面是我的java类

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public class ExpenseDetailsListVO {

private List<ExpenseDetailsVO> expenseDetailsVOs = LazyList.decorate(
new ArrayList<ExpenseDetailsVO>(),
FactoryUtils.instantiateFactory(ExpenseDetailsVO.class));

public ExpenseDetailsListVO (){}

public List<ExpenseDetailsVO> getExpenseDetailsVOs() {
return expenseDetailsVOs;
}

public void setExpenseDetailsVOs(List<ExpenseDetailsVO> expenseDetailsVOs) {
this.expenseDetailsVOs = expenseDetailsVOs;
}

@Override
public String toString() {
return“ExpenseDetailsListVO [expenseDetailsVOs=” + expenseDetailsVOs
+“]”;
}

}

public class ExpenseDetailsVO {

/*private int expenseId;*/

private String itemDescription;

private double amount;

private Date expenseDate;

public ExpenseDetailsVO (){}
/*public int getExpenseId() {
return expenseId;
}

public void setExpenseId(int expenseId) {
this.expenseId = expenseId;
}*/

public String getItemDescription() {
return itemDescription;
}

public void setItemDescription(String itemDescription) {
this.itemDescription = itemDescription;
}

public double getAmount() {
return amount;
}

public void setAmount(double amount) {
this.amount = amount;
}

public Date getExpenseDate() {
return expenseDate;
}

public void setExpenseDate(Date expenseDate) {
this.expenseDate = expenseDate;
}

@Override
public String toString() {
return“ExpenseDetailsVO [itemDescription=” + itemDescription
+“, amount=” + amount +“, expenseDate=” + expenseDate +“]”;
}

}

以前它可以工作，但我改变了一些我不记得的东西，现在在浏览器控制台中出现错误
客户端发送的请求语法错误

请各位大佬告诉我是什么问题…

The request sent by the client was syntactically incorrect in spring mvc, ajax

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