我正在尝试将 util-constant 用于 ioc,但收到以下错误消息:
cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'util:constant'.
All of the spring 3.1.1 dist jars are in my classpath and I was able to successfully run my program prior to making the changes that included the use of the util:constant tag.
Here's my ioc xml file:
<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>
最佳答案
这是 util
命名空间的正确声明(不要忘记指定 schemaLocation
):
<?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>
在 C.2.2 The util schema 上查看更多信息.
关于Java Spring : Error message "no declaration can be found for element ' util:constant',我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10523162/