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Java Spring注释的mbeans错误--实例化两次_Java_Spring_Spring Jmx - Fatal编程技术网

Java Spring注释的mbeans错误--实例化两次

Java Spring注释的mbeans错误--实例化两次,java,spring,spring-jmx,Java,Spring,Spring Jmx,我正在尝试使用Spring注释注册MBean 我的测试类看起来像: package examples.mbean; import org.springframework.jmx.export.annotation.ManagedOperation; import org.springframework.jmx.export.annotation.ManagedResource; import org.springframework.stereotype.Component; @Compone

我正在尝试使用Spring注释注册MBean

我的测试类看起来像:

package examples.mbean;

import org.springframework.jmx.export.annotation.ManagedOperation;
import org.springframework.jmx.export.annotation.ManagedResource;
import org.springframework.stereotype.Component;

@Component
@ManagedResource(objectName = "examples.mbean:name=MyMbean1")
public class MyMBean {

    @ManagedOperation(description = "Returns something.")
    public String getSomething() {
        return "Something";
    }

    MyMBean () {
        System.out.println("MyMBean constructor");
    }

}
dispatcher-servlet.xml如下所示

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    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-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <context:component-scan base-package="examples.springmvc, examples.mbean" />

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix">
            <value>/WEB-INF/views/</value>
        </property>
        <property name="suffix">
            <value>.jsp</value>
        </property>
    </bean>

    <context:mbean-export />
</beans>
编辑

根据这些评论,我还发布了web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>Archetype Created Web Application</display-name>
  <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
  </servlet-mapping>
  <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/dispatcher-servlet.xml</param-value>
  </context-param>
  <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
  </listener>
</web-app>

Web应用程序创建的原型
调度员
org.springframework.web.servlet.DispatcherServlet
1.
调度员
/
上下文配置位置
/WEB-INF/dispatcher-servlet.xml
org.springframework.web.context.ContextLoaderListener

请显示您的web.xml。最常见的情况是,这样的问题是由两次加载上下文或bean引起的。你有ContextLoaderListener吗?如果是,它是否也使用组件扫描?

请显示您的web.xml。最常见的情况是,这样的问题是由两次加载上下文或bean引起的。你有ContextLoaderListener吗?如果是这样,它是否也使用组件扫描?

多亏了Gary的回答,我才能够解决这个问题

我不得不从web.xml中注释掉以下几行

<listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
  </listener>

org.springframework.web.context.ContextLoaderListener

事实证明,ContextLoadListener还加载了带注释的bean,我认为这些bean将由dispatcher servlet.xml中的组件扫描获取。多亏了Gary的回答,我才能够解决这个问题

我不得不从web.xml中注释掉以下几行

<listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
  </listener>

org.springframework.web.context.ContextLoaderListener
事实证明,ContextLoadListener还加载了带注释的bean,我假设dispatcher-servlet.xml中的组件扫描会提取这些bean