Quartz 作业在 Tomcat 6/Ubuntu 10.04LTS 上部署时运行两次

Question

我运行一个基于 Spring Framework/SmartGWT 的 Web 应用程序，现在添加了一个 Quartz 作业。该作业应该每天凌晨 2 点运行，并从数据库表中选出获胜者。从我的日志中，我看到它运行了两次，似乎同时运行，因为如您所见，日志重叠：

Generating winners of yesterday...
Generating winners of yesterday...
winning id's: 15
done, mail queue is filled.

winning id's: 18
done, mail queue is filled.

我的 applicationContext.xml 看起来像这样：

<!-- initiates and calls the job -->  
<beans:bean id="GenerateWinnersAndFillMailingQueueJobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean"> 
  <beans:property name="targetObject" ref="GenerateWinnersAndFillMailingQueueJobExecutor"/>  
  <beans:property name="targetMethod" value="execute"/> 
</beans:bean>  
<!-- here's where we use the Cron like scheduling expression      to define when the bean is run. -->  
<beans:bean id="GenerateWinnersAndFillMailingQueueJob" class="org.springframework.scheduling.quartz.CronTriggerBean"> 
  <beans:property name="jobDetail" ref="GenerateWinnersAndFillMailingQueueJobDetail"/>  
  <!-- run every morning at 2AM -->  
  <beans:property name="cronExpression" value="0 0 2 * * ?"/> 
</beans:bean> 
... another quartz jobs is defined here, omitted for clarity ...
<beans:bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean"> 
  <beans:property name="triggers"> 
    <beans:list> 
      <beans:ref bean="GenerateWinnersAndFillMailingQueueJob"/>  
      <beans:ref bean="SendEmailsFromMailQueueJob"/> 
    </beans:list> 
  </beans:property> 
</beans:bean> 

我真的不明白这里出了什么问题，这是一个非常简单的用例。当我在带有 GWT 开发模式的服务器上进行本地测试时，它确实有效。仅当部署到 Ubuntu 10.04 LTS 上的 Tomcat6 时，我才会遇到此问题。

有什么想法吗？

** 编辑：在评论提示后，增加日志级别，似乎 Spring 运行了两次。重启tomcat服务器可以看到实例化了两个Spring，相隔4秒左右。

2011-08-29 08:49:22,567 {ABSOLUTE}  INFO XmlWebApplicationContext,Thread-9:1002 - Closing Root WebApplicationContext: startup date [Sun Aug 28 20:53:39 CEST 2011]; root of context hierarchy
2011-08-29 08:49:22,569 {ABSOLUTE}  INFO DefaultLifecycleProcessor,Thread-9:345 - Stopping beans in phase 2147483647
2011-08-29 08:49:22,589 {ABSOLUTE}  INFO QuartzScheduler,Thread-9:537 - Scheduler org.springframework.scheduling.quartz.SchedulerFactoryBean#0_$_NON_CLUSTERED paused.
2011-08-29 08:49:22,592 {ABSOLUTE}  INFO DefaultListableBeanFactory,Thread-9:422 - Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@12e14ebc: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,MerchantSimpleJsonWebservice,merchantDao,AdvertisementSimpleJsonWebservice,advertisementDao,ContactFormSubmitsSimpleJsonWebservice,contactFormSubmitsDao,PlayerCustomJsonWebservice,PlayerCustomJsonWebserviceImpl,submitSolutionDao,GenerateWinnersAndFillMailingQueueJobExecutor,GenerateWinnersAndFillMailingQueueJobDetail,GenerateWinnersAndFillMailingQueueJob,SendEmailsFromMailQueueJobExecutor,SendEmailsFromMailQueueJobDetail,SendEmailsFromMailQueueJob,org.springframework.scheduling.quartz.SchedulerFactoryBean#0,org.springframework.security.web.PortMapperImpl#0,org.springframework.security.web.context.HttpSessionSecurityContextRepository#0,org.springframework.security.authentication.ProviderManager#0,org.springframework.security.access.vote.AffirmativeBased#0,org.springframework.security.web.access.intercept.FilterSecurityInterceptor#0,org.springframework.security.web.access.DefaultWebInvocationPrivilegeEvaluator#0,org.springframework.security.authentication.AnonymousAuthenticationProvider#0,org.springframework.security.web.savedrequest.HttpSessionRequestCache#0,org.springframework.security.config.http.UserDetailsServiceInjectionBeanPostProcessor#0,org.springframework.security.filterChainProxy,sessionAuthenticationStrategy,sessionRegistry,propertyConfigurer,org.springframework.security.authentication.dao.DaoAuthenticationProvider#0,org.springframework.security.authentication.DefaultAuthenticationEventPublisher#0,org.springframework.security.authenticationManager,saltSource,dataSource,jdbcTemplate,passwordEncoder,jdbcUserService,loggerListener,formLoginFilter,authenticationEntryPoint,accessDeniedHandler,concurrencyFilter]; root of factory hierarchy
2011-08-29 08:49:22,601 {ABSOLUTE}  INFO SchedulerFactoryBean,Thread-9:760 - Shutting down Quartz Scheduler
2011-08-29 08:49:22,601 {ABSOLUTE}  INFO QuartzScheduler,Thread-9:616 - Scheduler org.springframework.scheduling.quartz.SchedulerFactoryBean#0_$_NON_CLUSTERED shutting down.
2011-08-29 08:49:22,602 {ABSOLUTE}  INFO QuartzScheduler,Thread-9:537 - Scheduler org.springframework.scheduling.quartz.SchedulerFactoryBean#0_$_NON_CLUSTERED paused.
2011-08-29 08:49:22,603 {ABSOLUTE}  INFO QuartzScheduler,Thread-9:688 - Scheduler org.springframework.scheduling.quartz.SchedulerFactoryBean#0_$_NON_CLUSTERED shutdown complete.
2011-08-29 08:49:22,882 {ABSOLUTE}  INFO XmlWebApplicationContext,Thread-9:1002 - Closing Root WebApplicationContext: startup date [Sun Aug 28 20:53:34 CEST 2011]; root of context hierarchy
2011-08-29 08:49:22,883 {ABSOLUTE}  INFO DefaultLifecycleProcessor,Thread-9:345 - Stopping beans in phase 2147483647
2011-08-29 08:49:22,903 {ABSOLUTE}  INFO QuartzScheduler,Thread-9:537 - Scheduler org.springframework.scheduling.quartz.SchedulerFactoryBean#0_$_NON_CLUSTERED paused.
2011-08-29 08:49:22,904 {ABSOLUTE}  INFO DefaultListableBeanFactory,Thread-9:422 - Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@402fb002: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,MerchantSimpleJsonWebservice,merchantDao,AdvertisementSimpleJsonWebservice,advertisementDao,ContactFormSubmitsSimpleJsonWebservice,contactFormSubmitsDao,PlayerCustomJsonWebservice,PlayerCustomJsonWebserviceImpl,submitSolutionDao,GenerateWinnersAndFillMailingQueueJobExecutor,GenerateWinnersAndFillMailingQueueJobDetail,GenerateWinnersAndFillMailingQueueJob,SendEmailsFromMailQueueJobExecutor,SendEmailsFromMailQueueJobDetail,SendEmailsFromMailQueueJob,org.springframework.scheduling.quartz.SchedulerFactoryBean#0,org.springframework.security.web.PortMapperImpl#0,org.springframework.security.web.context.HttpSessionSecurityContextRepository#0,org.springframework.security.authentication.ProviderManager#0,org.springframework.security.access.vote.AffirmativeBased#0,org.springframework.security.web.access.intercept.FilterSecurityInterceptor#0,org.springframework.security.web.access.DefaultWebInvocationPrivilegeEvaluator#0,org.springframework.security.authentication.AnonymousAuthenticationProvider#0,org.springframework.security.web.savedrequest.HttpSessionRequestCache#0,org.springframework.security.config.http.UserDetailsServiceInjectionBeanPostProcessor#0,org.springframework.security.filterChainProxy,sessionAuthenticationStrategy,sessionRegistry,propertyConfigurer,org.springframework.security.authentication.dao.DaoAuthenticationProvider#0,org.springframework.security.authentication.DefaultAuthenticationEventPublisher#0,org.springframework.security.authenticationManager,saltSource,dataSource,jdbcTemplate,passwordEncoder,jdbcUserService,loggerListener,formLoginFilter,authenticationEntryPoint,accessDeniedHandler,concurrencyFilter]; root of factory hierarchy
2011-08-29 08:49:22,913 {ABSOLUTE}  INFO SchedulerFactoryBean,Thread-9:760 - Shutting down Quartz Scheduler
2011-08-29 08:49:22,914 {ABSOLUTE}  INFO QuartzScheduler,Thread-9:616 - Scheduler org.springframework.scheduling.quartz.SchedulerFactoryBean#0_$_NON_CLUSTERED shutting down.
2011-08-29 08:49:22,914 {ABSOLUTE}  INFO QuartzScheduler,Thread-9:537 - Scheduler org.springframework.scheduling.quartz.SchedulerFactoryBean#0_$_NON_CLUSTERED paused.
2011-08-29 08:49:22,915 {ABSOLUTE}  INFO QuartzScheduler,Thread-9:688 - Scheduler org.springframework.scheduling.quartz.SchedulerFactoryBean#0_$_NON_CLUSTERED shutdown complete.
2011-08-29 08:49:26,484 {ABSOLUTE}  INFO ContextLoader,main:187 - Root WebApplicationContext: initialization started

后来，两个 Spring 实例似乎启动了：

2011-08-29 08:49:26,484 {ABSOLUTE}  INFO ContextLoader,main:187 - Root WebApplicationContext: initialization started
...
2011-08-29 08:49:31,221 {ABSOLUTE}  INFO ContextLoader,main:187 - Root WebApplicationContext: initialization started

这可能是什么原因造成的，该怎么办？

Answer 1

我修复了它，不仅石英运行了两次，而且我的应用程序也部署了两次。这是因为 Tomcat 文档中的以下内容：

使用自动部署时，XML 上下文文件定义的 docBase 应位于 appBase 目录之外。如果不是这种情况，部署 Web 应用程序可能会遇到困难，或者应用程序可能会部署两次。可以使用deployIgnore属性来避免这种情况。

最后，请注意，如果您在 server.xml 中显式定义上下文，则可能应该关闭自动应用程序部署或仔细指定 deployIgnore。否则，Web 应用程序将分别部署两次，这可能会导致应用程序出现问题。

我遵循了有关如何让 mod_jk 工作的教程，以及 本教程包含该缺陷。

Answer 2

对我来说，自动部署是问题所在，要禁用它，我必须在 server.xml 中的 host 元素上指定以下属性：

deployOnStartup="false"
autoDeploy="false"

所以我的 host 元素如下所示：

  <Host name="localhost" 
        deployOnStartup="false"  
        appBase="webapps" 
        unpackWARs="false" 
        autoDeploy="false">

我发现 这篇文章详细介绍了该问题帮助我解决这个问题的不同方式。

Answer 3

您最终是否会在 Ubunut 计算机上的一个 Tomcat 实例中运行多个应用程序？我想我记得 Quartz 有一些静态代码，它将在一个 Java VM 中的所有应用程序中共享这些代码。