tomcat总是自动停止_问答-阿里云开发者社区

有人遇到过相似的问题吗？
1. tomcat在停止时有详细的关停日志，不是oom：

Nov 20, 2014 4:32:18 AM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["http-bio-80"]
Nov 20, 2014 4:32:18 AM org.apache.catalina.core.StandardService stopInternal
INFO: Stopping service Catalina
INFO [localhost-startStop-2|2014-11-20 04:32:18,631] XmlWebApplicationContext.doClose(1042) | Closing WebApplicationContext for namespace 'index-servlet': startup date [Thu Nov 20 02:18:52 CST 2014]; parent: Root WebApplicationContext
INFO [localhost-startStop-2|2014-11-20 04:32:18,632] DefaultListableBeanFactory.destroySingletons(444) | Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@7ac4bd0f: defining beans [blogController,indexController,userController,oauthController,toolsController,loginRequiredInterceptor,requestLocalDataInterceptor,weiboUserController,weiboPlazaController,weiboController,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,jsonMessageConverter,contentNegotiationManager,viewResolver,org.springframework.web.servlet.view.InternalResourceViewResolver#0,mvcContentNegotiationManager,org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping#0,org.springframework.format.support.FormattingConversionServiceFactoryBean#0,org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter#0,org.springframework.web.servlet.handler.MappedInterceptor#0,org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver#0,org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver#0,org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver#0,org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping,org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter,org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter,org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver#1,org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver#1,cn.iangus.index.web.resolver.ExceptionResolver#0,org.springframework.web.servlet.handler.MappedInterceptor#1,org.springframework.web.servlet.handler.MappedInterceptor#2,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; parent: org.springframework.beans.factory.support.DefaultListableBeanFactory@3022338b
log4j:WARN No appenders could be found for logger (org.springframework.web.context.support.XmlWebApplicationContext).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http:// logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Nov 20, 2014 4:32:18 AM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Nov 20, 2014 4:32:18 AM org.apache.coyote.AbstractProtocol stop
INFO: Stopping ProtocolHandler ["http-bio-80"]
Nov 20, 2014 4:32:18 AM org.apache.coyote.AbstractProtocol destroy
INFO: Destroying ProtocolHandler ["http-bio-80"]

2.  也不是通过关闭端口关掉的，因为日志里没有“INFO: A valid shutdown command was received via the shutdown port. Stopping the Server instance.”
3.  网上看到有位童鞋的帖子，他怀疑是因为gc时内存占满，同时云机器都没swap导致进程被kill。但我目前内存占用一直保持在40%左右，同时还分了1g的swap区。
4.  tomcat也升级成了7，不过我觉得和这个关系不大。

问题从大半年前开始，每次上线了新功能之后就容易出现这种问题，但是重新启动后就没事儿了。