Quartz + Spring double execution

I have Quartz 2.2.1 and Spring 3.2.8 app. My problem is that during startup Quartz creates two jobs with the following one 2 seconds later. My job must be executed every 10 seconds, yet it executes twice:

Info:   INFO: Starting TASK on Mon Apr 20 16:22:21 CEST 2015
Info:   INFO: Starting TASK on Mon Apr 20 16:22:23 CEST 2015
Info:   INFO: Starting TASK on Mon Apr 20 16:22:31 CEST 2015
Info:   INFO: Starting TASK on Mon Apr 20 16:22:33 CEST 2015
Info:   INFO: Starting TASK on Mon Apr 20 16:22:41 CEST 2015
Info:   INFO: Starting TASK on Mon Apr 20 16:22:43 CEST 2015

I tried to follow the suggestions on Quartz + Spring double execution on startup. The provided answers (removal of tag containing "ContextLoaderListener" within web.xml) didn't help as I had an error that the WebContext was missing. Thanks for your help.

Here is my web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://ift.tt/nSRXKP"
         xmlns:xsi="http://ift.tt/ra1lAU"
         xsi:schemaLocation="http://ift.tt/nSRXKP 
 http://ift.tt/LU8AHS">
    <servlet>
        <servlet-name>spring</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>spring</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
    <jsp-config>
        <jsp-property-group>
            <description>header and footer settings</description>
            <url-pattern>/WEB-INF/*</url-pattern>
            <include-prelude>/WEB-INF/header.jspf</include-prelude>
        </jsp-property-group>
    </jsp-config>

    <!-- Spring Security -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <listener>
        <listener-class>utils.SessionCounterListener</listener-class>
    </listener>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            /WEB-INF/spring-servlet.xml
        </param-value>
    </context-param>

    <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>

My spring-servlet.xml look like this:

<?xml version="1.0" encoding="windows-1252"?> <beans xmlns="http://ift.tt/GArMu6"
       xmlns:xsi="http://ift.tt/ra1lAU"
       xmlns:p="http://ift.tt/1jdM0fE"
       xmlns:context="http://ift.tt/GArMu7"
       xmlns:mvc="http://ift.tt/1bHqwjR"
       xmlns:aop="http://ift.tt/OpNdV1"
       xmlns:tx="http://ift.tt/OGfeU2"
       xsi:schemaLocation="
       http://ift.tt/GArMu6
       http://ift.tt/QEDs1e
       http://ift.tt/GArMu7
       http://ift.tt/QEDs1k
       http://ift.tt/1bHqwjR
       http://ift.tt/1bVJL9q
       http://ift.tt/OpNdV1
       http://ift.tt/QEDs1g
       http://ift.tt/OGfeU2
       http://ift.tt/1cQrvTl">

    <!-- Use @Component annotations for bean definitions -->

    <context:component-scan base-package="cinema"/>

    <!-- Use @Controller annotations for MVC controller definitions -->

    <mvc:resources mapping="/resources/**" location="/resources/" />

    <mvc:annotation-driven />


    <bean id="exampleBusinessObject" class="cinema.controller.ServerMonitorController"/>


    <bean id="jobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
        <property name="targetObject" ref="exampleBusinessObject"/>
        <property name="targetMethod" value="sendIt"/>
        <property name="concurrent" value="false"/>
    </bean>

    <bean id="simpleTrigger" class="org.springframework.scheduling.quartz.SimpleTriggerFactoryBean">
        <property name="jobDetail" ref="jobDetail"/>
        <!-- czas do odczekania 
        <property name="startDelay" value="10000"/>-->
        <!-- czas pomiedzy odpaleniami (50 sek = 50000) -->
        <property name="repeatInterval" value="10000"/>
    </bean>

    <bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
        <property name="triggers">
            <list>
                <ref bean="simpleTrigger"/>
            </list>
        </property>
    </bean>


    <bean id="emf" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="loadTimeWeaver">
            <bean class="org.springframework.instrument.classloading.glassfish.GlassFishLoadTimeWeaver"/>
        </property>
    </bean>


    <tx:jta-transaction-manager />

    <!-- Use @Transaction annotations for managing transactions -->
    <tx:annotation-driven />

    <!-- View resolver -->
    <bean class=
     "org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/"/>
    </bean>

    <import resource="/spring-security.xml" /> </beans>

ServerMonitorController.java :

@Controller
public class ServerMonitorController {

    public static void sendIt() throws FileNotFoundException, IOException {

        System.out.println("INFO: Starting TASK on "+ new Date());

    }
}