Spring Boot BeanCreationException: InstanceAlreadyExistsException - MBean Name Conflict

This is a BeanCreationException caused by a InstanceAlreadyExistsException. The error message suggests that there is already an existing MBean with the name 'org.springframework.boot:type=Admin,name=SpringApplication'.

The stack trace indicates that the error occurred during the initialization of the 'springApplicationAdminRegistrar' bean, which is defined in the 'SpringApplicationAdminJmxAutoConfiguration' class.

The root cause of the exception is that the MBean server is trying to register an MBean with a name that is already taken by another MBean. This can happen if multiple instances of the same application are running concurrently.

To resolve this issue, you can try the following steps:

1. Check if there are multiple instances of the application running. If so, stop the other instances and try running the application again.

2. If you are using an IDE, make sure that you are not running multiple instances of the application within the IDE.

3. If you are using Spring Boot Admin, make sure that you have configured it correctly and there are no conflicts with other MBeans.

4. If none of the above steps work, you can try disabling the 'SpringApplicationAdminJmxAutoConfiguration' by excluding it from the auto-configuration process. You can do this by adding the following annotation to your main application class:

   @SpringBootApplication(exclude = SpringApplicationAdminJmxAutoConfiguration.class)
   

   This will disable the auto-configuration that is causing the exception.

If the issue still persists, you may need to provide more details about your application and the configuration you are using, so that we can provide more specific guidance.