BeanCreationException：创建名为“springApplicationAdminRegistrar”的bean时出错。 InstanceAlreadyExistsException异常

问题描述

我有2个春季启动应用程序。

I have 2 spring boot applications.

application_A dependsn_on application_B

application_A dependsn_on application_B

实际上每个应用程序都有主类标记为 @SpringBootApplication

Actually each of applications has main class marked as @SpringBootApplication

application_B 成功启动，但 application_A 无法启动：

application_B starts successfully but application_A doesn't start:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'springApplicationAdminRegistrar' defined in class path resource [org/springframework/boot/autoconfigure/admin/SpringApplicationAdminJmxAutoConfiguration.class]: Invocation of init method failed; nested exception is javax.management.InstanceAlreadyExistsException: org.springframework.boot:type=Admin,name=SpringApplication # JMX name of the application admin MBean.
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107)
    at pack.Application.main(Application.java:36)
Caused by: javax.management.InstanceAlreadyExistsException: org.springframework.boot:type=Admin,name=SpringApplication # JMX name of the application admin MBean.
    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.boot.admin.SpringApplicationAdminMXBeanRegistrar.afterPropertiesSet(SpringApplicationAdminMXBeanRegistrar.java:92)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624)
    ... 15 common frames omitted

在调试中我看到spring在启动期间执行 org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration＃springApplicationAdminRegistrar 两次。

In debug I see that spring executes org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration#springApplicationAdminRegistrar twice during startup and fails.

我试图设置属性：

 spring.application.admin.enabled=false

但它对我没有帮助。

我怎样才能避免这种异常？

How can I avoid this exception?

我发现这个但是没有解决方案

I've found this one https://github.com/spring-projects/spring-boot/issues/6378 but there is no solution

推荐答案

SpringApplicationAdminJmxAutoConfiguration 的代码如下：

String jmxName = this.environment.getProperty(JMX_NAME_PROPERTY,
            DEFAULT_JMX_NAME);
    if (this.mbeanExporters != null) { // Make sure to not register that MBean twice
        for (MBeanExporter mbeanExporter : this.mbeanExporters) {
            mbeanExporter.addExcludedBean(jmxName);
        }
    }
    return new SpringApplicationAdminMXBeanRegistrar(jmxName);

我们有这些常数：

/**
 * The property to use to customize the {@code ObjectName} of the application admin
 * mbean.
 */
private static final String JMX_NAME_PROPERTY = "spring.application.admin.jmx-name";

/**
 * The default {@code ObjectName} of the application admin mbean.
 */
private static final String DEFAULT_JMX_NAME = "org.springframework.boot:type=Admin,name=SpringApplication";

所以，你应该考虑把那个 jmx-name 对于每个应用程序都是唯一的。我的意思是你需要指定 spring.application.admin.jmx-name 配置属性。

So, you should consider to make that jmx-name as unique for each application. I mean you need specify spring.application.admin.jmx-name configuration property.

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