Spring PermGen空间问题

Question

我一直有一个非常严重的生产问题,我希望有人可以提供帮助.

我正在使用Spring 3.1.0并且对它的功能印象深刻.

在开发过程中,一切都很好.不幸的是,在部署到生产时,我们遇到了一些问题.

我们正在使PermGen空间出现内存错误.

在我们的开发/测试框中,我们有以下设置:-Xms2048m -Xmx2048m -XX:PermSize = 512m -XX:MaxPermSize = 1024m(请注意我们不确定这些设置是否正确)

在我们的生产箱中,我们有以下设置:-Xms3056m -Xmx3056m -XX:PermSize = 128m -XX:MaxPermSize = 512m(再次请注意,我们不确定这些设置是否正确)

不可否认,生产环境完全不同,因为它上面运行的应用程序更多.

根据我在这里读到的,我们应该将max和min设置为相同的值,并将maxpermsize设置为其中任何一个的1/4.

我已经在许多地方(包括这里)读过,由于泄漏而重启服务器可能是不可避免的.有谁知道这是真的吗？

另外,有人知道Spring框架通常需要多少内存？部署应用程序后,我发现使用的内存量增加了大约345 MB.我知道在启动应用程序时需要实例化一些类,但这似乎很多.我有不正确的设置吗？我们目前只使用Spring JDBC.有没有办法将框架仅限于这些类？

我们的代码库相当大,我理解JAXB会导致严重的问题.

我见过使用的建议

-XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled

在这里和这里.使用这些参数是否有任何可能的负面影响？

所以,总结一下:

1. 我们的设置是否正确,如果没有,它们应该是什么？

2. Spring框架不时会不时地重启服务器吗？

3. Spring应该占用多少内存？有没有办法限制使用的类？

4. 使用有任何可能的副作用-XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled吗？

任何和所有的帮助将不胜感激.提前致谢.

堆栈跟踪在下面(还有更多,但我不能全部发布):

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter]: Constructor threw exception; nested exception is java.lang.OutOfMemoryError: PermGen space
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:997)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:943)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:485)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:286)
    at org.springframework.web.servlet.DispatcherServlet.createDefaultStrategy(DispatcherServlet.java:788)
    at org.springframework.web.servlet.DispatcherServlet.getDefaultStrategies(DispatcherServlet.java:757)
    at org.springframework.web.servlet.DispatcherServlet.initHandlerAdapters(DispatcherServlet.java:565)
    at org.springframework.web.servlet.DispatcherServlet.initStrategies(DispatcherServlet.java:422)
    at org.springframework.web.servlet.DispatcherServlet.onRefresh(DispatcherServlet.java:410)
    at org.springframework.web.servlet.FrameworkServlet.onApplicationEvent(FrameworkServlet.java:752)
    at org.springframework.web.servlet.FrameworkServlet$ContextRefreshListener.onApplicationEvent(FrameworkServlet.java:989)
    at org.springframework.web.servlet.FrameworkServlet$ContextRefreshListener.onApplicationEvent(FrameworkServlet.java:1)
    at org.springframework.context.event.GenericApplicationListenerAdapter.onApplicationEvent(GenericApplicationListenerAdapter.java:51)
    at org.springframework.context.event.SourceFilteringListener.onApplicationEventInternal(SourceFilteringListener.java:97)
    at org.springframework.context.event.SourceFilteringListener.onApplicationEvent(SourceFilteringListener.java:68)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:97)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:324)
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:929)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:467)
    at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:631)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:588)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:645)
    at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:508)
    at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:449)
    at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:133)
    at javax.servlet.GenericServlet.init(GenericServlet.java:241)
    at weblogic.servlet.internal.StubSecurityHelper$ServletInitAction.run(StubSecurityHelper.java:283)
    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
    at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
    at weblogic.servlet.internal.StubSecurityHelper.createServlet(StubSecurityHelper.java:64)
    at weblogic.servlet.internal.StubLifecycleHelper.createOneInstance(StubLifecycleHelper.java:58)
    at weblogic.servlet.internal.StubLifecycleHelper.<init>(StubLifecycleHelper.java:48)
    at weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.java:539)
    at weblogic.servlet.internal.WebAppServletContext.preloadServlet(WebAppServletContext.java:1976)
    at weblogic.servlet.internal.WebAppServletContext.loadServletsOnStartup(WebAppServletContext.java:1950)
    at weblogic.servlet.internal.WebAppServletContext.preloadResources(WebAppServletContext.java:1869)
    at weblogic.servlet.internal.WebAppServletContext.start(WebAppServletContext.java:3126)
    at weblogic.servlet.internal.WebAppModule.startContexts(WebAppModule.java:1512)
    at weblogic.servlet.internal.WebAppModule.start(WebAppModule.java:486)
    at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:425)
    at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:41)
    at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:119)
    at weblogic.application.internal.flow.ScopedModuleDriver.start(ScopedModuleDriver.java:200)
    at weblogic.application.internal.flow.ModuleListenerInvoker.start(ModuleListenerInvoker.java:247)
    at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:425)
    at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:41)
    at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:119)
    at weblogic.application.internal.flow.StartModulesFlow.activate(StartModulesFlow.java:27)
    at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:1267)
    at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:41)
    at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:409)
    at weblogic.application.internal.EarDeployment.activate(EarDeployment.java:58)
    at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:161)
    at weblogic.deploy.internal.targetserver.AppContainerInvoker.activate(AppContainerInvoker.java:79)
    at weblogic.deploy.internal.targetserver.operations.AbstractOperation.activate(AbstractOperation.java:569)
    at weblogic.deploy.internal.targetserver.operations.ActivateOperation.activateDeployment(ActivateOperation.java:150)
    at weblogic.deploy.internal.targetserver.operations.ActivateOperation.doCommit(ActivateOperation.java:116)
    at weblogic.deploy.internal.targetserver.operations.StartOperation.doCommit(StartOperation.java:143)
    at weblogic.deploy.internal.targetserver.operations.AbstractOperation.commit(AbstractOperation.java:323)
    at weblogic.deploy.internal.targetserver.DeploymentManager.handleDeploymentCommit(DeploymentManager.java:844)
    at weblogic.deploy.internal.targetserver.DeploymentManager.activateDeploymentList(DeploymentManager.java:1253)
    at weblogic.deploy.internal.targetserver.DeploymentManager.handleCommit(DeploymentManager.java:440)

Answer 1

很难判断多少内存最适合生产环境。-Xms 不必等于（或与 -Xmx 一样高）。您可以将其设置为较低的值，但增加 -XX:PermSize 的值。另外，为了获得最佳值，您应该尝试进行基准测试，看看什么可以提供最佳结果。