[英]Spring @Scheduled task runs twice
我正在創建一個@Scheduled
任務,每5秒運行一次。 就像其他問題一樣,我的任務運行了兩次!
我查看了其他問題,並在此處閱讀了適用的文檔,但是我仍然無法解決問題。
我知道啟動我的tomcat服務器時,我的@Scheduled
類的兩個單獨實例被實例化。 我還想出了何時參考我的日志文件實例化它們。
與該日志行關聯的一個:
INFO:初始化Spring根WebApplicationContext
另一個與此日志行:
INFO:初始化Spring FrameworkServlet'servlet'
這是spring配置文件。
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:security="http://www.springframework.org/schema/security"
xmlns:task="http://www.springframework.org/schema/task"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd">
<context:component-scan base-package="web.controllers"/>
<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"/>
<mvc:annotation-driven/>
<mvc:default-servlet-handler/>
<task:annotation-driven />
我的簡單Java類:
package scheduled;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;
@Service
public class Notifier {
@Scheduled(fixedDelay = 5000)
public void notifyUsersOfBidItems() {
try {
System.out.println(this);
} catch (Exception e) {
e.printStackTrace();
}
}
}
另外,我正在使用Spring 4。
編輯: Adding web.xml
<web-app 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_3_0.xsd"
version="3.0">
<display-name>Archetype Created Web Application</display-name>
<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>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>servlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring_config.xml</param-value>
</context-param>
<error-page>
<error-code>404</error-code>
<location>/error/notFound</location>
</error-page>
<error-page>
<error-code>403</error-code>
<location>/error/notFound</location>
</error-page>
<error-page>
<location>/error/internal</location>
</error-page>
<!-- 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>
我相信這是由於在您的web.xml中兩次加載相同的配置文件引起的
<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>
編輯以解決此問題:
創建另一個文件servlet-servlet.xml(默認情況下,它將由ServletDispatcher配置拾取,因為它通過Servlet名稱與該文件匹配)。該文件將包含以下內容:
<beans>
<context:component-scan base-package="web.controllers"/>
<mvc:annotation-driven/>
<mvc:default-servlet-handler/>
</beans>
修改原始文件(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>
將您的Web xml Servlet配置修改為以下內容:
<servlet>
<servlet-name>servlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
我也有這個問題。 我正在使用Spring4。我沒有xml配置。 一切都通過注釋和Java配置進行配置。
我有一個基本配置和一個WebConfiguration。 該錯誤是由於在兩種配置中均使用@ComponentScan引起的。 我從基本配置中刪除了組件掃描。
@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();
}
解決方案:Quartz + Spring雙重執行java config
getServletConfigClasses()->返回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[]{"/"};
}
}
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