BeanCreationException: An error occurred while creating a bean named "springApplicationAdminRegistrar". InstanceAlreadyExistsException

Question

I have 2 spring boot applications.

application_A dependsn_on application_B

In fact, each application has a main class marked as @SpringBootApplication

application_B starts successfully, but application_A does not 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 

In debugging, I see spring executing org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration#springApplicationAdminRegistrar twice during startup and not working.

I tried setting the property:

  spring.application.admin.enabled=false 

But it doesn’t help me.

How can I avoid this exception?

PS

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

Answer 1

SpringApplicationAdminJmxAutoConfiguration has code like:

 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); 

Where do we have these constants:

 /** * 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"; 

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