Spring @Scheduled is executing task twice when using annotations

Question

I have made task using Spring @Scheduled annotation, but for some reason it is executing task twice. My Spring Framework version is 3.0.2.

@Service
public class ReportService {

    @Scheduled(fixedDelay=1000 * 60 * 60* 24)
    @Transactional
    public void dailyReportTask()
    {
        ... code here ...
    }

}

Here is my 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:task="http://www.springframework.org/schema/task"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task-3.0.xsd">
    <task:scheduler id="taskScheduler" />
    <task:executor id="taskExecutor" pool-size="1" />
    <task:annotation-driven executor="taskExecutor"
        scheduler="taskScheduler" />
</beans>

Answer 1

it is happening because of context listener

Just remove

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

from web.xml it should work.

Answer 2

I had this same problem, and I eventually found out that the problem was occurring as a result of the beans being created in the root context as well as the servlet context.

So, to fix this, you need to separate the creation of the beans into the appropriate contexts.

This answer explains really well how to that and was what fixed my problem.