Spring @Scheduled task runs twice

Question

I am creating an @Scheduled task to run every 5 seconds. As has been a problem in other questions, my task is running twice!

I have looked at other ques

Answer 1

I also had this problem. I am using Spring 4. I have no xml configuration. Everything is configured with annotations and Java config.

I have a base configuration and a WebConfiguration. the error was caused by using @ComponentScan in both configurations. I removed component scan from base configuration.

@EnableWebMvc
@ComponentScan(basePackages = { "com.myservice" })
@Configuration
public class WebConfiguration extends WebMvcConfigurerAdapter {
  @Bean
  public UrlBasedViewResolver setupViewResolver() {
    UrlBasedViewResolver resolver = new UrlBasedViewResolver();
    resolver.setPrefix("/WEB-INF/jsp/");
    resolver.setSuffix(".jsp");
    resolver.setViewClass(JstlView.class);
    return resolver;
  }

  @Override
  public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
    configurer.enable();
  }
}

@Configuration
@EnableScheduling
//@ComponentScan(basePackages = { "com.myservice" })  
@PropertySource("${myservice.properties.location:classpath:myservice.properties}")
public class BaseConfiguration  {


  @Autowired
  Environment environment;

  @Bean
  public static PropertySourcesPlaceholderConfigurer properties() {
    return new PropertySourcesPlaceholderConfigurer();
  }

Answer 2

I believe this is caused by same config file being loaded twice in your web.xml

<servlet>
    <servlet-name>servlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/spring_config.xml</param-value> <!-- FIRST -->
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/spring_config.xml</param-value> <!-- SECOND -->
</context-param>

EDIT To fix it:

Create another file servlet-servlet.xml (this will be picked up by the ServletDispatcher config by default since it matches the file by servlet name) The file will contain this:

<beans>
    <context:component-scan base-package="web.controllers"/>
    <mvc:annotation-driven/>
    <mvc:default-servlet-handler/>
</beans>

Modify the original file (spring-config.xml):

<beans>
    <task:annotation-driven />
    <context:component-scan base-package="services"/>
    <context:component-scan base-package="dao"/>
    <context:component-scan base-package="scheduled"/>
    <context:property-placeholder location="/WEB-INF/application.properties"/>
</beans>

Modify your web xml servlet config to following:

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

Answer 3

solution : Quartz + Spring double execution java config

getServletConfigClasses()-> return null;

    public static class MvcWebApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {


    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[]{WebConfig.class};
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return null;
    }

    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};

    }
}

example code solution