Spring MVC AutoPopulatingList错误

Question

我正在使用＆＃34创建表单;添加行＆＃34;项目和使用AutoPopulatingList for spring。我从基本开始只用了一行。

我有模特：

ContractEntitlement.java

public class ContractEntitlement {

    private String category;

    getter and setter ....
}

我为AutoPopulatingList创建了一个表单类：

CreateForm.java

@Entity
public class CreateForm {

    private AutoPopulatingList contractEntitlements;

    public AutoPopulatingList getContractEntitlements() {
        return contractEntitlements;
    }
    public void setContractEntitlements(AutoPopulatingList contractEntitlements) {
        this.contractEntitlements = contractEntitlements;
    }
}

对于我的控制器：

CreateController.java

@RequestMapping(value = "/create", method = RequestMethod.GET)
public String createForm(Model model) {

    CreateForm createForm = new CreateForm();

//      CreateForm sbf = new CreateForm(); 
//      //sbf.getContractEntitlements().add(new ContractEntitlement());
//      sbf.setContractEntitlements(new 
//        AutoPopulatingList(ContractEntitlement.class)); 
    return "create";
}    

对于我的jsp

Create.jsp

    <spring:bind path="createForm.contractEntitlements[0].category">
                <form:input path="${status.expression}" size="40" />
    </spring:bind>

请注意，在我的控制器中，我已经注释了几行代码，因为我正在测试哪个代码可以运行，但都失败了，我收到了这个错误：

org.springframework.beans.NotReadablePropertyException: Invalid property 'contractEntitlement' of bean class [com.at.ccts.model.CreateForm]: Bean property 'contractEntitlement' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?

如果我在我的控制器中使用它

CreateForm sbf = new CreateForm(); 
    sbf.setContractEntitlements(new 
AutoPopulatingList(ContractEntitlement.class)); 

错误：

ERROR: org.springframework.web.servlet.tags.form.InputTag - Invalid property 'contractEntitlement' of bean class [com.at.ccts.model.CreateForm]: Bean property 'contractEntitlement' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?

我错过了什么吗？是什么原因导致错误？