在Spring Boot应用程序中刷新Spring ApplicationContext时获取异常

Question

我们正在为应用程序使用Spring Boot。 启动应用程序后，在运行时中，我们将一个新Bean添加（加载）到现有ApplicationContext中。

AnnotationConfigApplicationContext appContext = new AnnotationConfigApplicationContext();
appContext.register(NewBean.class);
appContext.refresh();

添加bean之后，我们正在刷新applicationContext

在刷新期间，MBean尝试重新注册一些端点，并且我们收到以下错误（获取所有这些端点的错误-requestMappingEndpoint，environmentEndpoint，healthEndpoint，beansEndpoint，infoEndpoint，metricsEndpoint，traceEndpoint，dumpEndpoint，autoConfigurationAuditEndpoint，shutdownEndpoint，configurationPropertiesReportEndpoint）

Caused by: javax.management.InstanceAlreadyExistsException: org.springframework.boot:type=Endpoint,name=configurationPropertiesReportEndpoint
        at com.sun.jmx.mbeanserver.Repository.addMBean(Unknown Source)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(Unknown Source)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(Unknown Source)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(Unknown Source)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(Unknown Source)
        at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(Unknown Source)
        at org.springframework.jmx.support.MBeanRegistrationSupport.doRegister(MBeanRegistrationSupport.java:195)
        at org.springframework.jmx.export.MBeanExporter.registerBeanInstance(MBeanExporter.java:662)
        at org.springframework.jmx.export.MBeanExporter.registerBeanNameOrInstance(MBeanExporter.java:605)

谁能告诉我如何跳过此异常？

我也尝试了以下

@EnableIntegrationMBeanExport(registration = RegistrationPolicy.REPLACE_EXISTING)

但得到以下异常

Caused by: org.springframework.jmx.export.UnableToRegisterMBeanException: Unable to register MBean [org.springframework.integration.monitor.IntegrationMBeanExporter@16c5464] with key 'integrationMbeanExporter'; nested exception is javax.management.InstanceAlreadyExistsException: org.springframework.integration.monitor:name=integrationMbeanExporter,type=IntegrationMBeanExporter
    at org.springframework.jmx.export.MBeanExporter.registerBeanNameOrInstance(MBeanExporter.java:609)
    at org.springframework.jmx.export.MBeanExporter.registerBeans(MBeanExporter.java:534)
    at org.springframework.jmx.export.MBeanExporter.afterPropertiesSet(MBeanExporter.java:416)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1612)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1549)
    ... 22 more
Caused by: javax.management.InstanceAlreadyExistsException: org.springframework.integration.monitor:name=integrationMbeanExporter,type=IntegrationMBeanExporter
    at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:437)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(DefaultMBeanServerInterceptor.java:1898)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:966)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:900)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:324)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522)
    at org.springframework.jmx.support.MBeanRegistrationSupport.doRegister(MBeanRegistrationSupport.java:195)
    at org.springframework.jmx.export.MBeanExporter.registerBeanInstance(MBeanExporter.java:662)
    at org.springframework.jmx.export.MBeanExporter.registerBeanNameOrInstance(MBeanExporter.java:599)
    ... 26 more

Answer 1

在对现有 ApplicationContext调用refresh之前，应首先销毁它，否则Bean继续运行。

AnnotationConfigApplicationContext appContext = new AnnotationConfigApplicationContext();
appContext.register(NewBean.class);
appContext.refresh();

您在此处显示的是您正在构造一个新的上下文，而不是重用现有的上下文。 register方法也适用于@Configuration类，而不是任意bean。 如果要添加这些，只需使用ApplicationContext上的方法之一，例如registerSingleton 。 但是总的来说，在运行时添加bean应该是一件坏事（恕我直言）。

Answer 2

某些applicationContext可以刷新时间，但不能刷新时间AnnotationConfigApplicationContext。 当构造运行刷新方法的AnnotationConfigApplicationContext时，将报告此异常，可以先销毁它，然后刷新