春季3预定任务运行3次 [英] spring 3 scheduled task running 3 times
问题描述
我有一个非常简单的方法,计划每10秒运行一次,如下所示:
I have a very simple method scheduled to run every 10 seconds like this:
@Component
public class SimpleTask {
@Scheduled(fixedRate=10000)
public void first() {
System.out.println("Simple Task " + new Date());
}
}
配置:
<task:annotation-driven executor="myExecutor" scheduler="myScheduler" />
<task:executor id="myExecutor" pool-size="5" />
<task:scheduler id="myScheduler" pool-size="10" />
我的问题是我的方法每10秒被调用3次.应该只调用一次.我究竟做错了什么? 我在SpringSource tc Server 6中使用Spring Source ToolSuite.
My problem is that my method is being invoked 3 times every 10 seconds. It should be invoked just once. What am I doing wrong? I use Spring Source ToolSuite with SpringSource tc Server 6.
推荐答案
我遇到了同样的问题.原因之一是Spring 3.0.0中的错误.我升级到3.0.5,重复次数减少到只有两个.
I had this same problem. One of the causes is a bug in Spring 3.0.0. I upgraded to 3.0.5 and the repetition went down to only two.
另一个原因是因为我的具有@Scheduled方法的类被实例化了两次.发生这种情况是因为上下文配置被加载了两次.在web.xml中,我将ContextLoaderListener和DispatcherServlet指向相同的上下文配置文件:
The other cause was because my class that had the @Scheduled method was getting instantiated twice. This happened because the context config was getting loaded twice. In web.xml I was pointing my ContextLoaderListener and DispatcherServlet at the same context config file:
...
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
...
WEB-INF/applicationContext.xml是ContextLoaderListener的默认上下文配置.因此,请确保ContextLoaderListener和ServletDispatcher使用的上下文文件不同.我最终创建了一个/WEB-INF/spring-servlet.xml,没有任何bean定义,并且可以完美地工作.
WEB-INF/applicationContext.xml is the default context config for the ContextLoaderListener. So make sure that your ContextLoaderListener and your ServletDispatcher are using different context files. I ended up creating a /WEB-INF/spring-servlet.xml without any bean definitions and it worked flawlessly.
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