Java Spring：错误消息“找不到元素'util：constant'的声明

java spring

2022-09-01 18:12:02

我正在尝试将util-constant用于ioc，但我收到以下错误消息：

cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'util:constant'.

所有 spring 3.1.1 dist jar 都在我的类路径中，在进行更改（包括使用 util：constant 标记）之前，我能够成功运行我的程序。

这是我的ioc xml文件：


<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"
 xmlns:tool="http://www.springframework.org/schema/tool"
 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-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>

答案 1

这是命名空间的正确声明（不要忘记指定）：utilschemaLocation

<?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">


</beans>

有关详细信息，请参阅 C.2.2 util 架构。

答案 2