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我正在尝试对域类对象进行一些验证，但是当我调用“验证”方法时出现了一个奇怪的异常。我有一个输入一些数据的表格： html表单 这是我的表格的代码：

<body>
<div id='register'>
    <div class='inner'>
        <div class='fheader'>Register</div>

        <g:if test='${flash.message}'>
            <div class='login_message'>${flash.message}</div>
        </g:if>

        <form action='<g:createLink controller="register" action="create" />' method='POST' id='registerForm' class='cssform' autocomplete='off'>
            <p>
                <label for='username'>Username:</label>
                <input type='text' class='text_' name='username' id='username'/>
            </p>

            <p>
                <label for='password'>Password:</label>
                <input type='password' class='text_' name='password' id='password'/>
            </p>

            <p>
                <label for='passwordConfirmation'>Confirm:</label>
                <input type='password' class='text_' name='passwordConfirm' id='passwordConfirmation'/>
            </p>

            <p>
                <input type='submit' id="submit" value='REGISTER'/>
            </p>
        </form>
    </div>
</div>
</body>

这是我的控制器的代码。接收 POST 的方法是“创建”。

package genealogicaltree

import gentree.security.UserCommand
import grails.converters.JSON
import org.springframework.security.access.annotation.Secured

@Secured('permitAll')
class RegisterController {

    static allowedMethods = [index:'GET', create:['POST']]

    def springSecurityService

    def index() {
       render(view: 'register')
    }

    def create() {
        def userCommand = new UserCommand(params)
        if(userCommand.validate())
            render "valid"
        else
            render "invalid"
    }
}

这是我的域类的样子：

class UserCommand{
    public String username 
    public String password
    public String passwordConfirm
    static constraints = {
        username  size: 6..15, blank: false
        password  size: 6..15, blank: false
        passwordConfirm blank: false
    }
}

使用调试我可以看到来自 POST 的数据已绑定到 userCommand 对象： 在此处输入图像描述

但是，我收到这样的错误消息： 在此处输入图像描述

这是控制台输出：

Error |
2015-04-02 15:41:57,180 [http-bio-8080-exec-7] ERROR errors.GrailsExceptionResolver  - NotReadablePropertyException occurred when processing request: [POST] /GenealogicalTree/register/create - parameters:
passwordConfirm: password
username: username
password: ***
Invalid property 'username' of bean class [gentree.security.UserCommand]: Bean property 'username' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?. Stacktrace follows:
Message: Invalid property 'username' of bean class [gentree.security.UserCommand]: Bean property 'username' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?
    Line | Method
->>   20 | create    in genealogicaltree.RegisterController
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    198 | doFilter  in grails.plugin.cache.web.filter.PageFragmentCachingFilter
|     63 | doFilter  in grails.plugin.cache.web.filter.AbstractFilter
|     53 | doFilter  in grails.plugin.springsecurity.web.filter.GrailsAnonymousAuthenticationFilter
|     49 | doFilter  in grails.plugin.springsecurity.web.authentication.RequestHolderAuthenticationFilter
|     82 | doFilter  in grails.plugin.springsecurity.web.authentication.logout.MutableLogoutFilter
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
^    745 | run . . . in java.lang.Thread

当代码调用“userCommand.validate()”时会引发异常。我不明白我在这里做错了什么。提前致谢！

4

1 回答 1

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您应该将 getter 和 setter 添加到您的域类中以删除它。

Grails 编译器默认会生成这些方法，例如。

myObject.myValue = "hello";

是相同的

myObject.setMyValue("hello");

然而，它显然并不完美，你会得到这样的错误！如果您使用的 Grails 版本 < 2.3.2，那么这是一个已知错误，并且存在Jira 问题，因此您可以通过升级您的 Grails 版本来解决它。

于 2015-04-02T21:33:13.177 回答