java - Spring Schedule 方法被调用两次

Question

我已经阅读了所有关于方法在 Spring 上被调用两次的问题，但我无法解决这个问题。

我使用注解 @Scheduled 不时地运行一个任务。

@Scheduled(fixedDelay = 60000)
    public void getTickets() {

Tomcat 运行 WebApplicationContext

.16:33:00.598 [localhost-startStop-1] INFO  o.s.web.context.ContextLoader - Root WebApplicationContext: initialization started 
.16:33:00.752 [localhost-startStop-1] INFO  o.s.w.c.s.XmlWebApplicationContext - Refreshing Root WebApplicationContext: startup date [Fri Jul 11 16:33:00 BRT 2014]; root of context hierarchy 
.16:33:00.835 [localhost-startStop-1] INFO  o.s.b.f.xml.XmlBeanDefinitionReader - Loading XML bean definitions from ServletContext resource [/WEB-INF/applicationContext.xml]     ...

和 servlet 上下文。

.16:33:01.614 [localhost-startStop-1] INFO  o.s.web.servlet.DispatcherServlet - FrameworkServlet 'my-context': initialization started 
.16:33:01.620 [localhost-startStop-1] INFO  o.s.w.c.s.XmlWebApplicationContext - Refreshing WebApplicationContext for namespace 'my-context-servlet': startup date [Fri Jul 11 16:33:01 BRT 2014]; parent: Root WebApplicationContext 
.16:33:01.621 [localhost-startStop-1] INFO  o.s.b.f.xml.XmlBeanDefinitionReader - Loading XML bean definitions from ServletContext resource [/WEB-INF/my-context-servlet.xml] 

然后我的方法被调用了两次。

我认为有两种选择:

1 - 删除根 WebApplicationContext。

这可能吗？当我删除那段代码时:

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

我无法从我的 Web 应用程序中获取任何内容。

GRAVE: Servlet.service() for servlet [my-context] in context with path [] threw exception java.lang.IllegalStateException: No WebApplicationContext found: no ContextLoaderListener registered?
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:252)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)

2 - 从根上下文中“过滤”类

有可能做这样的事情吗？

这是我的完整 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_2_5.xsd"
    version="2.5">
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <servlet>
        <servlet-name>my-context</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>my-context</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!-- Spring Security -->
    <filter>
        <filter-name>springSecurityFilterChain</filter-name>
        <filter-class>org.springframework.web.filter.DelegatingFilterProxy
        </filter-class>
    </filter>

    <filter-mapping>
        <filter-name>springSecurityFilterChain</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

对于解决此问题的任何帮助，我表示感谢。

谢谢。

Answer 1

@Evgeni 可能是对的，您的 bean 被实例化了两次。

这是对我有用的。请注意，在此设置中，将计划的注释放在不从 dispatcher-servlet.xml 调用的地方很重要。为了可维护性，我将所有计划的例程保存在 *.utilities.scheduledRoutines 下。

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <!-- Creates the Spring Container shared by all Servlets and Filters -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <listener>
        <listener-class>net.xyz.ncc.utilities.ShutdownListener</listener-class>
    </listener>

    <context-param>
       <param-name>contextConfigLocation</param-name>
       <param-value>classpath:spring/security-config.xml,classpath:spring/app-config.xml,/WEB-INF/spring/servlet-context.xml</param-value>
    </context-param>

    <!-- Handles all requests into the application -->
    <servlet>
        <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>
                /WEB-INF/spring/dispatcher-servlet.xml
            </param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>  

    <servlet-mapping>
        <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
        <url-pattern>*.html</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

    <!--  Spring Security -->
    <filter>
        <filter-name>springSecurityFilterChain</filter-name>
        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>springSecurityFilterChain</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping> 

</web-app>

dispatcher-servlet.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:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
        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-3.1.xsd">    

    <context:component-scan base-package="net.xyz.ncc.controller" />

    <!-- Configures support for @Controllers -->
    <mvc:annotation-driven />

    <!-- Resolves view names to protected .jsp resources within the /WEB-INF/views directory -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

servlet-context.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:context="http://www.springframework.org/schema/context"
    xmlns:task="http://www.springframework.org/schema/task"
    xsi:schemaLocation="http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.1.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">

    <context:component-scan base-package="net.xyz.ncc" />

    <task:annotation-driven executor="taskExecutor" scheduler="taskScheduler" />
    <task:executor id="taskExecutor" pool-size="1"  /> 
    <task:scheduler id="taskScheduler" pool-size="1"  />


</beans>