Java Spring : getting error "Unknown property sub-element: "

Question

我正在尝试对 ioc 使用 util:constant 标记，但收到以下错误消息:

Exception in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: Error registering bean with name 'threadPoolExecutor' defined in class path resource [spring.xml]: Unknown property sub-element: <util:constant>

这是我的xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" 
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:util="http://www.springframework.org/schema/util"
 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd 
 http://www.springframework.org/schema/util  http://www.springframework.org/schema/util/spring-util-3.1.xsd">


<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="locations">
        <value>classpath:config.properties</value>
    </property>
</bean>

<bean id="main" class="pikefin.Main">
<property name="executorSample" ref="executorSample"/>
</bean>


<bean id="executorSample" class="pikefin.ExecutorSample">
    <constructor-arg ref="threadPoolExecutor" />

</bean>


<bean id="threadPoolExecutor" class="java.util.concurrent.ThreadPoolExecutor">
    <constructor-arg index="0" value="2"/>
    <constructor-arg index="1" value="2"/>
    <constructor-arg index="2" value="10"/>
    <constructor-arg index="3"><util:constant static-field="java.util.concurrent.TimeUnit.SECONDS"/></constructor-arg>
    <constructor-arg index="4" ref="arrayBlockingPool"/>
</bean>

<bean id="arrayBlockingPool" class="java.util.concurrent.ArrayBlockingQueue">
    <constructor-arg value="5"/>
</bean>

</beans>

更新:

这是我的带有 <value> 的 xml添加的标签会导致不同的错误消息:

发现以元素“util:constant”开头的无效内容。此时不需要子元素。

(旁注:由于某种原因，我的格式控件在 SO 中发布时消失了)


xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd">


<属性名称="位置">
类路径:config.properties

















<值>

Answer 1

对于枚举，您可以直接分配值，Spring 会负责将其绑定(bind)到正确的枚举:

<constructor-arg index="3" value="SECONDS">

此外，您的原始条目对我来说非常有用:

<bean id="threadPoolExecutor" class="java.util.concurrent.ThreadPoolExecutor">
    <constructor-arg index="0" value="2"/>
    <constructor-arg index="1" value="2"/>
    <constructor-arg index="2" value="10"/>
    <constructor-arg index="3"><util:constant static-field="java.util.concurrent.TimeUnit.SECONDS"/></constructor-arg>
    <constructor-arg index="4" ref="arrayBlockingPool"/>
</bean>