春季-属性'名称'不允许出现在元素'constructor-arg'中 [英] Spring - Attribute 'name' is not allowed to appear in element 'constructor-arg'

问题描述

我在程序中使用hsqldb作为数据库.我想在春季注入构造函数值.

I am using hsqldb as a db in my program. I want to inject the constructor values over spring.

这是我的豆子:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="ConnectionManager" class="at.tuwien.group2.vpm.persistence.ConnectionManager"
        scope="singleton">
        <constructor-arg name="url" value="jdbc:hsqldb:file:vpmDatabasetest" />
        <constructor-arg name="user" value="sa" />
        <constructor-arg name="password" value="" />
    </bean>

我的构造函数如下:

public ConnectionManager(String url, String user, String password) {
    if(url == null || user == null || password == null) {
        throw new NullPointerException("Paramaeter cannot be null!");
    }
    this.url = url;
    this.user = user;
    this.password = password;
}

但是，当我想执行代码时，会得到:

However, when I want to execute the code I get:

属性名称"不允许出现在元素"constructor-arg"中

Attribute 'name' is not allowed to appear in element 'constructor-arg'

属性名称"不允许出现在元素"constructor-arg"中

Attribute 'name' is not allowed to appear in element 'constructor-arg'

我应该用什么代替?

推荐答案

我猜您正在使用Sping2.x.使用 index 属性明确指定构造函数参数的索引:

I guess you are using Sping 2.x. Use the index attribute to specify explicitly the index of constructor arguments：

   <bean id="ConnectionManager" ...>
        <constructor-arg index="0" value="jdbc:hsqldb:file:vpmDatabasetest" />
        <constructor-arg index="1" value="sa" />
        <constructor-arg index="2" value="" />
    </bean>

此外，从 Spring 3.0 开始，您还可以使用构造函数参数名称来消除歧义.

Moreover, as of Spring 3.0 you can also use the constructor parameter name for value disambiguation.

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